Will the 840 EVO limit the potential of the 850 Pro in this setup?

Consider the following setup for use with Adobe Premiere Pro CC 2014 as well as After Effects CC 2014 (I would mostly be rendering/exporting to .mp4 or h.264 using AVCHD source media):
Motherboard: MSI X99S Gaming 7
OS: Windows 8.1 Pro
CPU: Intel 5960x (8 cores, 3.0 ghz, 20 mb cache)
GPUs: 2 SLI GTX 970s
RAM: 32 GB
SSDs:
250 Samsung 840 EVO for OS, Pagefile, and Programs
1TB Samsung 850 Pro for Media Cache, Exports, Original/Source Media Files, Previews, and Projects.
Considering the aforementioned setup, would the 840 EVO, in any way shape or form, limit the potential of the 850 pro during any type of rendering/exporting/reading? I doubt it because most of the work is being done on the 1TB 850 Pro, but I don't really know for sure. Considering that the application itself has to be read and is operating on the 840 Pro, I genuinely don't know if it will potentially bottleneck the 850 Pro during these crucial processes. Can anybody point me straight here? On top of that, is there any other way that you might recommend allocating the different file types in the above setup?

That's not much of a problem to me in comparison to the real work. However, to be more specific, take my logic here and explain where I'm either wrong or right.
The 850 Pro is fast and effective at locating, reading, and writing data.
However, the 840 EVO is the SSD running Adobe Premiere Pro CC 2014 (where the program itself is installed).
Here we go; is the following correct or just a wrong assumption:
Since the 840 EVO runs Adobe Premiere, it can only be sending the data to the processor/gpu/etc as fast as the 840 EVO can do; thus, the fact that the 850 Pro can run faster will have little to NO benefit because the instructions that the application/program itself (Adobe Premiere Pro CC 2014) is sending to the parts that do all of the rendering/exporting/work is restricted by the speed of the 840 EVO. Am I correct here?
Basically, to avoid as much confusion as possible:
Due to the fact that the program that sends all of the instructions (as in, telling the CPU to render this and export that, etc) to the CPU/GPU/etc is SLOWER than the 850 Pro, from which all of the data (media, previews, etc) is accessed, then the speed benefits of the 850 pro over the 840 EVO will NOT be utilized and therefore wasted.
This is just my assumption. Where am I wrong here, or is this correct? To use the true benefits of the 850 Pro, should the SSD that the applications are installed on also be an 850 Pro?

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I realize the education section is huge, and appreciate the attempts to group like apps, but it still wont let me get to those updated or published, say, last spring. They are all the "top 20" or most recent. There used to be a choice called "all apps" but I dont see it in the education apps section like I do in other sections.

There may be other ways, but if you go back to the main iTunes Store page and select Browse, then App Store -> Education, you'll see all the apps available. You can sort by release date, which I believe is the default or by the other columns.
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MSI GT70 0NC 494 - Samsung 840 Evo Problem

I recently brought a Samsung 840 Evo 500GB to replace the WD Black HDD on my MSI GT70-0NC-494 laptop. OS is Windows 8. Im going type out pretty much how I ended up to where I am right now in hopes that maybe someone could catch where I went wrong.
So here's the story:
The cloning process went smoothly and I was able to load the OS from the SSD without any problems. Then I immediately updated the firmware and I set the optimizations using the Magician software.
I ran CrystalDiskMark and had speeds around ~300MB for both read and writes on the sequential test. Thought that my speeds were kind of slow when comparing them to the others I've seen. AHCI is on. I know my laptop has a SATA 2 and SATA 3 slot but I did plug the SSD in the SATA 3. SATA 3 connection is confirmed through Intel RST application and Samsung Magician. The speed is just not around the ballpark of what everyone is getting.
Ok, let's see the speeds with Rapid Mode so I turned on Rapid Mode and restarted. Then I get a "Start PXE over IPv6/4" message which then leads to the BIOS screen. Turn off laptop, turn it on, and get the same message. Turn off laptop again, turn it on, and the OS loads this time.
I thought that was weird but whatever I got to the OS, I thought. Open up Task Manager to see how Rapid Mode affects my RAM capacity since my regular usage already puts me ~1.5GB below max. 1.9GB shows up on RAM. Thought I'd be starting closer to 3GB. Then again, Im not entirely sure on how Rapid Mode works so whatever. Run the benchmark test through Magician software.
(This pic was from after I reinstalled Win 8 but the performance drop was similar)
Ok, , the read speeds is now garbage. Did the test on CrystalDiskMark and it shows similar results. It was late at night and Im feeling tired so I keep my laptop idle overnight to see if that would help. Nope, read speeds are still garbage. Surprisingly enough, CrystalDiskMark would show write speeds for sequential hitting ~1000MB/s so it seems that the write process is somewhat fine. The read process seems like it's broken.
So I turn off Rapid Mode and see if that fixes my read speeds. Restart. Get BSOD on startup. Turned laptop on and off multiple times to see if anything works but no avail. Thankfully I created a set of recovery disks 2 days ago so I immediately run that now. I was planning to restore the OS to factory install anyways so its fine.
OS is restored. At this point Im scared of installing the Samsung Magician software so I make a restore point. This time I want to see what happens if I install the software and run Rapid Mode through Win 8.1.
Seems like I can't just upgrade to 8.1 without installing a bunch of updates first so I do that. I got impatient so I went ahead and installed Magician and did the optimizations. CrystalDiskMark showed ~300MB/s for read and ~400MB/s for write. Ran the Magician benchmark and it produced the light blue bars on the screenshot above.
Let's try Rapid Mode now. Turn Rapid Mode on, restart, and I am again greeted with the "Start PXE over IPv6/4" message before hitting the BIOS. Now Im telling myself that I messed up again. Turned off the laptop and turned it on. OS is back. Awesome, only 1 try.
Did benchmarks on Magician which again showed that my read speeds were garbage (dark blue bars). I'm not even going to touch Rapid Mode for fear of having to reinstall the OS again. So now Im trying to upgrade to Win 8.1 and see if that fixes something.
Download 8.1, restart, I get some BSOD message with the code "0xC1900101 - 0X20017", restart through BIOS, and I get an error saying that 8.1 failed and Im being reverted to 8. Desktop loads up, I check Magician and my 840 Evo doesnt even appear on the drop down list. The software even says Rapid Mode is disabled even though I can see the Rapid Mode service through task manager.
Now Im just running tests, and restarting the laptop to install additional Windows updates. Upgrade to Windows 8.1 actually went through this time. After the update, Magician now says that Rapid Mode is on and my SSD again appears to be selectable. Read speeds seems to have gotten a *tiny bit* better but it is still extremely low.
Decided to say screw it, disabled Rapid Mode, restarted, again with the "Start PXE over IPv6/4". Turn off laptop, turn on, surprisingly no BSOD saying my system is forever broken. Now Im trying to see if I could salvage the performance back through messing with the settings so I followed most of the advice on another website.
Now it seems that the write speed is consistently good, but again the read speeds are absolutely horrid. I used AS-SSD for the benchmark instead of CrystalDiskMark this time.
And that is where I am right now. I am very sorry that the post is ridiculously long. I've been constantly looking around the internets to see if anyone has the same problem as me and I couldnt find a solution. I wanted to somewhat be detailed with my process so I can know whether this problem is the software or the MSI hardware. Or if the problem is with my specific SSD and that I'd have to RMA it.

How did you go about installing Windows?
It looks like the first time you used some software that ended up cloning it from the HDD to the SSD. That's a no-no in general, and I'd never trust it to work well.
Then the next time, you say you restored it. But you don't say if that was from the SSD/HDD or from recovery media that you had generated.
I'll be perfectly honest, I'd only trust installing from Recovery media when it comes to installing a new drive.
I'd say to do that. Install from Recovery media and see if that fixes the problem.
I will also say that a number of users have had issues with the Samsung 840 drives. Most of them were using the Samsung 840 Pro drives, not the EVO's, but just something to keep in mind. They were only able to get them to operate at SATA2 speeds.

Samsung 840 Evo incredibly slow in MacBook Pro 2011

I just got a brand new 250GB Samsung 840 Evo SSD and put it in my MacBook Pro. The drive is incredibly slow. OS X install took hours, and it takes over a minute to boot up. Even small tasks like clicking a button take several seconds to process. I have enabled TRIM through terminal (which took about an hour) and still no better. Is this something that can be fix or should I get an RMA# from NewEgg?

jeffturner24,
older firmware revisions of the 840 EVO are known to be problematic on Macs. You can download the latest firmware package for it (and an instructional PDF) from this Samsung page; with this package, you can burn a bootable DVD from which the latest firmware revision can be installed.
Another possibility is that you might have a faulty internal SATA cable. If you connect your SSD externally and boot from it then, and it runs at normal SSD speeds, but it remains incredibly slow when booting from it internally, that could point to a problem with your internal SATA cable. (Hard disks are more tolerant of a faulty internal SATA cable than SSDs are.)
If neither step above resolves the issue, then you should arrange an exchange with Newegg.

Replacing my HDD in my Early 2011 Macbook Pro...Trying to decide between Samsung 840 EVO 250 gb and Crucial M500 240 gb. Samsung is faster but less "mac-friendly". Should I opt for the Crucial due to the "mac-friendliness"?

I have a S.M.A.R.T error on my current Hitachi drive that came with me Early 2011 Macbook pro. Want to upgrade to SSD.
Trying to decide between Samsung 840 EVO 250gb and Crucial M500 240gb, at this gb range, the Samsung is faster and uses less wattage....ONE PROBLEM...I have read many user experiences that note it is much less mac-friendly...
The software samsung offers is not IOS compatible and some report lower than expected speeds after installation...Also apparently the RAPID MODE of the drive, the fastest drive mode is nonexistant when installed on a Macbook pro?
Should I opt for the slower and more power cosuming Crucial M500 240gb SSD because it is more Mac-friendly? Does anyone have a Samsung 840 EVO 250 gb SSD installed in their macbook pro? What has been your experience?
Thanks ahead of time!
Resoure: http://www.tomshardware.com/reviews/crucial-m500-1tb-ssd,3551.html

I decided against the Evo as there are too many Mac users that have had issues with slow speed on them. Even without these, the main speed that Samsung states for the Evo comes form turbo Write which is a PC only feature as is software dependent.
I'm sorry but Crucials M500 is simply too slow compared to modern drives to be recomended. Read speed is ok, but the write is far too slow for the price.
I've used and installed both a Samsung 840 basic and a Samsung 840 Pro in 2 separate Mac books! and currently have the 840 Pro in my own MacBook Pro and it comes very highly recomended. It's all but the fastest Sata III drive you can buy - A few OCZ drives just edge it but the difference is negligible. Samsung by far have the best reliability though when it comes to SSD's. I've been getting 520Mb/s easily on mine consistently, and without getting a MacBook with a PCIe drive you won't get a faster more reliable drive.
I really would recommend nothing else.

Will they get rid of the 2145 bar limit anytime soon?

I find it incredibly annoying and damaging to my creative flow that i can't simply write for hours on end and have it all recorded.
Yes, i know i can cycle, creating new tracks, and continue recording. But this is too hard on the head.
Does anyone know if they'll be allowing "endless" recording
once the new Mac os is released and the bit rate is doubled?

Based on my memories of a conversation with the developers about this from quite some time ago, the limit is there because it's based on the timestamping of MIDI events - something like the block size with 32-bit timestamps and Logic's internal resolution gives the 2,000+ bar figure.
From what I understand, this at the time (early-90's we're talking) was thought to be plenty of "room", and it meant that some nice efficiencies could be made in the engine code. Extending the bar limit is not just a matter of adding extra bars - the resolution and timestamping of the complete MIDI engine would have to be overhauled, and many of the optimisations wouldn't work out so well - in short, it's a fairly major undertaking.
Now this was some time ago, and computer's are faster, so maybe we will see this improving at some point. Certainly for me, there are other things I think of as being far more important - but that's the beauty of a large to-do list - whatever order you put the items in will be disastrously wrong for someone...

Please reset the ADE activation limit. Last Werk I bought a New ereader Now, when I will read a ebook then appears the message E_ACT_TOO_MANY_ACTIVATIONS

Please reset the ADE activation limit.
Last Werk I bought a New ereader
Now, when I will read a ebook then appears the message E_ACT_TOO_MANY_ACTIVATIONS

thanks alot,
now every thing is working fine, just what I needed!!!
regards and thanks again
Groy78

Will a Samsung Electronics 840 EVO-Series 500GB 2.5-Inch SATA III Single Unit Version Internal Solid State Drive MZ-7TE500BW work in a late 2013 Mac Mini

Will a Samsung Electronics 840 EVO-Series 500GB 2.5-Inch SATA III Single Unit Version Internal Solid State Drive MZ-7TE500BW work in a late 2013 Mac Mini

Would you happen to know if it will work in a mid 2007 iMac running Mavericks with 4GB of RAM? I need this to last this year and next year I am buying my MacPro, anyway, I dont want to put all the work in to installing it if its not going to work, thanks for any help!

128 GB limit Hard Drive - All the same but different

I'm currently replacing a dead drive with a Western Digital Blue 500gb in a G4 2X500. The drive is only reading 128 GB. Normally the answer to the question is you need a card.
My issue: I have another drive attached to a card that's reading 500 gb it's jumped as cable-select (which WD Documentation states the Mac doesn't support.) I've tried several combinations of attaching the drive on the same ribbon to no result. I've also directly attached it to the second ata input on the card. Nothing. I'm running out of ideas (althought I'm thinking of selecting a master/slave combination for the two drives on the same ribbon.)
Anyone have any thoughts or ideas?

If you formatted it on the Built-in ATA Bus, you probably ran up against the 128 GB limit due to your Hardware pre-dating the mid-2002 Macs mentioned in that article.( I must admit that article is information-dense and takes several readings to sort out how it applies to a particular situation.)
The issue I believe you now face is that different Drivers are used when connecting to the card Vs connecting to the built-in Bus.
When you initialize on the built-in Bus, only the drivers for the Built-in ATA controller are loaded onto the drive. When you look closely in Disk Utility, the active data partition will likely be about slice 3 \[partition 3], and references to it may read something like "disk2s3".
When you connect the drive to the PCI-slot Card, the SCSI driver is typically used. If the SCSI driver is not presnt on the drive \[which may be true in your case] the drive will not mount.
When you initialize the drive in an external enclosure or attached to the card, Drivers for all potential access methods are installed. When you look closely in Disk Utility, the active data partition will likely be about slice 10 \[partition 10], and references to it may read something like "disk2s10".
Once initialized on the card, all the drivers required will be present. But since the drive is larger than the 128 GB limit enforced on your Built-in ATA Bus, moving the drive back to the Built-in Bus will probably preclude mounting any partition that extends beyond the 128 GB barrier. So if you want to move it back to the built-in Bus later, creating a 127.9 GB (or smaller) partition as the first partition would be a good thing to try.
Message was edited by: Grant Bennet-Alder

GarageBand 10.0.2 will not open on MacBook Pro 15-inch, Early 2011 running OSX 10.9.5. w/ 8 GB RAM and 1 TB SSD Samsung 840 EVO.

GarageBand 10.0.2 will not open on MacBook Pro 15-inch, Early 2011 running OSX 10.9.5. w/ 8 GB RAM and 1 TB SSD Samsung 840 EVO.
Have deleted (secure delete) and reinstalled several times. Got it to open once right after download... Usually crashes/hangs upon attempted start-up, then shows as "Application unresponsive". Must be forced to quit.
No other audio interfaces or drivers installed that I am aware of. Playback through onboard audio interfaces, sometimes routed to Apple TV via Cat 5 cable, out to receiver via fiber optic SPDIF, or to Panasonic HDTV via HDMI cable through Thunderbolt port.

When you see a beachball cursor or the slowness is especially bad, note the exact time: hour, minute, second.
These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
The title of the Console window should be All Messages. If it isn't, select
          SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar at the top of the screen.
Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above.
Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first.
Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
Some private information, such as your name, may appear in the log. Anonymize before posting.

How to verify if aptX is active on the SB Evo Zx?

Hi!
I am pairing my Sound Blaster Evo Zx with Samsung Tablet, which supports aptX, through bluetooth and I am wondering if there is a way to verify whether the aptX is active? I have looked at the manuals and searched on internet but I have yet to find the answer. Would the aptX be on by default when both the headset and audio source support aptX?
Also, is there a way to turn on/off the aptX on Evo Zx? I know some Sony bluetooth headphones would require the user to turn on the aptX manually or it would be just the basic bluetooth connection. Is it the same case for the Evo Zx?
Thanks in advance and I would greatly appreciate your help.

Originally Posted by sbevozx
Hi JL,
Thanks for your clarification! So the improvement that I heard was not just placebo effect. Since I have no way to disable the aptX on the tablet, I would assume the improvement was mainly due to aptX and not the software/hardware of the tablet.
Thanks again! I really enjoy my SB Evo Zx. My only concern is the life expectancy of the battery which hopefully can be replaced somehow.
Regards,
sbevozx
Hey sbevozx,
Creative do not provide battery replacement for your existing unit. If your EVO Zx is still within warranty, our policy will honour a one-to-one replacement for you.
Like any rechargeable battery, it is advisable not to "over-stress" it during charging. In other words, adopt an approach to allow battery level to drop naturally low before starting the next charging cycle. This will limit the amount of charging cycles and prolong battery's life expectancy. I hope my suggestion helps to ease your concern.
Cheers!!
Yours sincerely,
JL

How to Open the FailedFilesLog.txt File (statement), and How to Increase the 100 File Limit (question)

It took us a while to figure this out, so I'm posting this in case it's helpful for someone out there. Plus, I have a question...
DPM gave the following error for one of our file servers:
Description: The replica of Volume D:\ on <servername> is inconsistent with the protected data source. Number of files skipped for synchronization due to errors has exceeded the maximum allowed limit of 100 files on this data
source (ID 32538 Details: Internal error code: 0x809909FE)
Recommended action: Review the failure errors for individual files from the log file
\\?\Volume{8492c150-f195-11de-a186-001cc4ef89a0}\B1E9D373-2C03-464E-A472-99BC93DB1E2A\FailedFilesLog.txt and take appropriate action. If some files fail consistently, you can exclude the folders containing these files by modifying the protection group or
moving the files to another location.
So, how do you actually open the FailedFilesLog.txt file shown in this DPM alert? What is this path referring to? Well, this is the mount point for the protected server's replica volume on the DPM server, which is mounted under \Program
Files\Microsoft DPM\DPM\Volumes\Replica\servername\File System. Here you'll see the mount points for all of the server's protected volumes. However, if you try to open one of these mounted volumes
in Windows Explorer, you'll get Access Denied, even if you have administrator rights. (If someone knows of a way around this, please let me know). As a workaround, you can access this mounted volume in an elevated
command prompt. Steps:
Open an Administrator Command Prompt
Type mountvol <AnyAvailableDriveLetter>: \\?\Volume{VolumeGUID}
Example: mountvol m: \\?\Volume{8492c150-f195-11de-a186-001cc4ef89a0} Note that we're only using the first part of the path to the FailedFilesLog.txt
file given in the DPM alert, starting from \\? and ending after the
} character.
Next, type m: to change to the newly mounted m: drive.
Then type cd B1E9D373-2C03-464E-A472-99BC93DB1E2A This is actually a folder name so we're just going into this folder.
Finally type dir and you should see the FailedFilesLog.txt file. This file can be copied to another location where it's easier to use (i.e. in Windows Explorer).
Be sure to unmount this volume when you're done by typing mountvol m: /d in the command prompt. (Mountvol reference:
http://technet.microsoft.com/en-us/library/cc772586(WS.10).aspx.)
What a pain, eh? But at least by reviewing the FailedFilesLog.txt file you can determine which files or folders caused the sync to fail and thus take action accordingly.
Now, here's my question: Where is that registry key that lets me adjust the limit of 100 files that DPM allows to be skipped before it fails the replica? Hopefully someone out there will tell me. I know this can be done because Kapil Malhotra
said so in this post:
http://groups.google.com/group/microsoft.public.dataprotectionmanager/browse_thread/thread/a179fa30fb50c9b0/e9a348f2a9386063?lnk=raot.
Also, does anyone know what the internal error code 0x809909FE means in this alert? Knowing this my help us determine what caused these files to fail. Interestingly, in the FailedFilesLog.txt file, it gave a different error code next to each failed file:
0x80070002.
-Taylorbox

Thanks for responding, Fahd. So, just to be sure...
Do I add this registry key to the DPM server or to the protected servers (or both)?
In either case, the ContinueOnFailure key does not currently exist. So, I must create this key and the MaxFailedFiles DWORD value
manually, right?
Does the server in which I create this regkey have to be restarted for it to take affect?
Can the DPM alert for the 0x809909FE error event (for exceeding the limit of 100 failures) please be adjusted to provide a path to the FailedFilesLog.txt file
that actually works if you click on it?
Any ideas on why the 0x80070002 "File not found" error happened? The files on the server were simply created and then deleted. Why would such file activity lead to this error?
Thanks,
-Taylorbox

HT1296 Hiya, I am thinking of buying my first Apple Ipod the new 32gb Ipod Touch. Will I be able to import the music that I currently have in the form of CDs and other music not purchsed from Itunes and if I can how do I go about doing this? I have heard

Hiya, Im thinking of buying my first ipod the Ipod Touch 32gb model. Will I be able to transfer the music I currently have stored in the form of CDs and already on my laptop onto the Ipod and if yes, how would I do this? I have heard from some friends that Apple and Itunes is notoriously limited in the types of formats that are accetable? I dont want to pay £249 on an Ipod only to find that Im locked into buying all my music from Itunes and I cant use the music that Ive already paid good money to buy from other sources. Many thanks for any help and advice that you may give me?

Many thanks JEM24 for your help. Ive just spent the best part of six hundred pounds on a new Sony Rx100m2 compact camera, so I have no interest in the Ipods camera at all really. I doubt Ill be watching many videos on it as Im very lucky in that I have a good Android tablet. Its more as a stock music player that Ill be buying the Ipod for, if indeed I do end up buying one. I dont like the idea of paying the exorbitant amount added for more memory space that Apple along with most other companies charge. In fact I read an article on this very subject just yesterday in the tech section of Flipboard. It stated in the article that in the case of the Iphone the actual cost of each additional gigabyte of storage to Apple et al is something in the order of 60p.. This is certainly not reflected in the price us the customer has to pay at the till.. Its for this reason primarily that Apple in particular, because their products do not allow adding expandable memory of your own in the form of cheap to buy cards, that nobody in their right mind buys the 64gig etc Iphones..I am aware that we are discussing my potential purchase of an Ipod Touch here but you see my point. Many thanks again though for helping me.

My 2008 iMac will get to the white boot up screen and has the loading circle and then it will freeze. And will freeze when attempting to boot recovery or bootable disc of Mavericks

Hi there, I have a 2008 iMac 24' 3.06 Intel Duo with 4gb ram. And yesterday it was working totally fine and jolly with no issues. Then I noticed there was an OS X update for Mavericks, so I finally decided to do it, and once it was rebooted it went to like the grey screen and I could move my mouse, just nothing else was there. So I tried to restart it, and then it booted up, but was really laggy, and so I decided to restart it and try again, this time the iMac froze at the login. So I decided to take it apart, pull the 500gb hard drive, connect it to my MacBook Pro, and then formatted it in Disc Utility. From there, I opened the Mavericks installer on my MacBook and then installed it to the iMac's hard drive via usb hard drive enclosement. And once the install of Mavericks was completed, I put the hard drive back into the iMac and tried to boot it. It now boots up to the white screen with the Apple and the loading circle underneath the Apple and then it freezes and doesn't go any further. So then once that happened, I turned it off and tried to boot it into recovery mode. Then it freezes on the screen with the Apple and loading circle below it. Then out of desperation, tried to use a bootable disc of Mavericks to see if i can at least get the iMac to boot up again, with no success. It froze at the same point again. So now I reach out to the Apple Community to see if anyone else has an idea on what I can do or if anyone had this issue and what they did to resolve it. Any help would be great. Thanks.

mddcfilms and Pat75, I'm having precisely this same issue -- no booting but spinning and freezing gear under the Apple logo. Have either of you come to a resolution? Here are my details:
iMac, Early 2008, 24”, 3.06 GHz, 4GB
September 2013: Nvidia GeForce 8800 GS GPU repaired, HDD replaced with Western Digital 2TB
21 April 2014: Erased HDD with Disk Utility on Mavericks USB; clean installation of Mavericks from the USB. Process completed without issue, including registration process. After a minute or two of poking around, machine shut down immediately (not through the shut-down process).
Since then it will not boot up. Grey screen and Apple logo appear, with gear spinning; the gear freezes, then the machine tries to boot up again. Occasionally I’ll hear “To use English for the main language, press the return key.”
I’ve tried booting into Safe Mode; same gear freeze and restart.
I’ve tried booting to the 10.9 Recovery disk; same gear freeze and restart.
Tried booting from Mavericks USB; same freeze and restart.
Tried booting from 10.6.3 DVD; same freeze and restart.
Ran Apple Service Toolkit (at Stormfront in the UK), which turned up nothing in error.
Started in single-user mode to test HDD and RAM, which are fine.
Started in verbose mode to check logs; some error messages but nothing seems crucial. After the log screen, the grey screen and Apple logo appear, gear spins, and then freeze.
Cannot get to Apple Hardware Test (vintage machine too old?)
Cannot get to Target Disk Mode with my MacBook Pro
Ideas: Potential booting flaw in Mavericks installation. Firmware incompatibility with Mavericks. Hardware issue in Nvidia GPU (known for problems). At the moment I'm hoping that it's a Mavericks installation or firmware issue, though I suspect the Nvidia GPU has blown up on me. These graphics cards are known for being pieces of junk, so I may try installing the lower spec ATI Radeon 2600 GPU if I can find one at a reasonable price.
Anybody else have precisely these problems or have any advice?

Will the 840 EVO limit the potential of the 850 Pro in this setup?

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