Mac Pro 2009 won't boot.

Hello,
Since yesterday my computer simply refuse to boot (Mac Pro 2009, Quad-Core 2.93 with a flashed Radeon 5870).
It was working fine the day before, I shut it down, unpluged it and when I came back the following day it wasn't working anymore.
When I try to boot it I can hear the fans but not the starting "DONG" it should do.
I tried to replace the graphic card with my old ATI 4870, tried to switch with some old RAM I had and tried to disconnect my hard drives one by one but it did nothing at all.
The only thing I have is this red dignostical LED you can see on this picture. I tried to find it's meaning but I wasn't able to find anything.
It would be nice if someone was able to tell me what this LED meant (and even nicer if it wasn't something expensive to replace !).
Thanks !

Hello once again,
So, I finally had time to look a little deeper into this processor board and after removing the heatsink and cleaning the processor I noticed two little plastic screws (the ugly little red arrow on the picture I took from macbidouille.com, not the nice and big one) maintaining another heatsink on the board.
I'm not sure what is the component under this heatsink but one of these screws was broken (they aren't really screws but I don't know how to explain in English) and the heatsink wasn't correctly positioned anymore so I replaced these two screws, put everything back in order (with some thermal grease on the processor and the unknown component) and everything worked like a charm when I was done.
Thanks everyone for your help !

Similar Messages

Mac Pro 2009 won't boot after airport installation

Hey everyone, looking for some insight here.
I recently bought a Mac Pro 2009 running Mavericks (at time of receipt). It didn't come with an airport card so I purchased one to install myself. The Mac was running fine until this evening when I finally got around to installing the card, however since then it won't get past the grey boot screen with apple logo. I've tried disconnecting the airport card to see if that reverted it, but no change. I also can't boot into safe mode, so that's no good. The only thing I can do is bring up the giant padlock with the option key held, which I saw elsewhere was connected with a firmware password (my admin doesn't work).
Any advice here would be greatly appreciated. Thanks!

It wouldn't be much of a lock if you could circumvent it with advice from a forum.
Obviously a valid point, although possibly somewhat niaive where forums are concerned (no disrespect intended).
It was more an expression of frustration than anything else, to be honest, though. It's kind of absurd that this happened following a simple hardware upgrade. Most people I know aren't even aware they can set a firmware password, so basically what it means is don't upgrade a machine that's intented to be upgraded (I'm aware of the hyperbole here).
Looks like it will be a Mac store trip, though, yes. A pain in the arse since even my nearest authorised technician is miles away.

Mac Pro 2009 Won't Turn On at all

i have a mac pro 2009 with 2.66ghz quad core xeon. today i just upgraded the graphics card from 8800GT to HD4870 and put a new 2TB hdd in with fresh install of Lion. went to dinner come back the computer is off i thought that's weird, hit the power the mac pro keeps on for 3 seconds then off, tried couple of times to turn on now it wont even start at all. if i hit the power button it just doesnt give me any response. does that mean a broken power supply or is it more look like a front panel issue?

See the won't power on section here, but it's not looking very good
 Cheat sheet to help diagnose and fix your Mac
Perhaps it's time for this
 Data recovery efforts explained
if you don't have a recent backup, but the hard drive sounds like it's still working, it can be removed and used to transfer files to a new Mac with IDE/SATA to USB adpater cable

Mac Pro (2009) won't start, no chime, black screen

Hi,
I am having a problem with my 2009 Mac Pro. It fails to boot. There is no chime and the screen wont turn on;stays black. It wont boot off of the system dvd and I even tried installing an HD that has a good version of the the OS on it. I also tried booting from the DVD with no installed drives to rule out one of the internal drives doing someothing funky. Nothing happens at all, the HD or DVD will spin for a moment and then all is dead.
Any suggestions? Thanks in advance.

or this one:
Troubleshooting: My computer won't turn on
If no joy, remove anything and everything that may be dragging down the power, in hopes of getting a chime. This includes graphics card, any other PCI cards, all drives, and some say all but a minimal amount of memory. Look for the chime.
If you get the chime, you can build slowly up from there. Add back graphics card and keep going. Add back memory and keep going. Add back DVD reader and boot from Installer/Utilities DVD or run the Apple Hardware Test. And so on.

Mac Pro 2008 won't boot from install disc - black screen

Hello,
I recently purchased a new hard drive to replace the original that came with my Mac Pro 2008. I was able to format the new drive using Disk Utility. I am now at the point where I need to install OS X onto the new drive, but the computer refuses to boot from the disc. The disc is recognized by the computer (I can access the disc and am able to use the BootCamp applications, etc.) but I just get a black screen when trying to boot directly from the disc. The computer boots fine otherwise.
I have tried the following:
I have tried using both the gray install disc that came with the computer and the Snow Leopard Install DVD disc.
I have tried booting using the "C" key and the "option" key but still receive a black screen following the chime (I've held these down for several minutes).
I have tried restarting from either install disc using the Bootcamp Assistant.
I have tried running the installation software to get it to restart from the disc.
I have tried a combination of the drives, i.e. trying to boot from the discs with just the new drive installed, just the original drive installed, and with both in bay1 and 2.
Everything results in the computer starting up, hearing the chime, and then nothing..just black screen. I have the original drive partitioned with BootCamp with OSX Snow Leopard and Windows 7 installed (I don't know that that matters).
I am at a loss as to what to try next. It doesn't seem like the superdrive because it is recognizing the disc, it just won't boot from it.
Any help is appreciated, thank you.

Clone should be a must and easy to do and learn (learn by doing! 2)
6800 would 'qualify' as 5x70 series flashed etc and same rule: 10.6.5
In the past there was 10.4.6, 10.5.6, but not 10.6.6 - even though strong need for such a DVD.
10.6.8 DVD would be excellent
Lion or ML - buy, download, make an installer flash card would be what I would do at this point.
Then keep both - dual boot as you learn and test and see what ML does and waht you had that required Rosetta to support PowerPC. See www.roaringapps.com about that.
With Carbon Coyp Cloner - was share, now commercial, great utility been around since 10.2.2 at least - this time 2003. 10 yrs.
You can clone the system folders, you can even selectively choose. You can skip copy of most of your home account and do that separately to another drive if you want.
Clone Windows with Paragon or WinClone and use Windows 7 or 8 DVD to do a system repair (automatic) or to edit the BCD file. It can and should - and all you do is boot Windows 7 DVD w/ only the one drive present and go at it. Piece of cake. But yes, Windows gets fussy if you change or remove or move. BCD to the rescue. A proper program for cloning like Paragon's "Clone OS" meant for going from disk drives to SSDs, knows that and how to do it.
Back to how to clone etc:
Clone
Disk utility has RESTORE which will also clone your system but not the Lion Recovery partition. Oddly Apple did not 'endorse' making bootable clone of the system which works too but most choose Carbon Copy Cloner - it works more consistently; it allows for smart update of the backup volume. Both can backup to a sparse disk image if desired.
Using Cloning as a Backup Strategy
http://www.macupdate.com/app/mac/7032/carbon-copy-cloner
http://www.bombich.com/software/updates/ccc-3.5.html
OS X Lion Install to Different Drive
How to create an OS X Lion installation disc MacFixIt
Migration Assistant Update for Mac OS X Snow Leopard
http://www.apple.com/support/lion/installrecovery/
Create an OS X Lion Install disc
http://reviews.cnet.com/8301-13727_7-20080989-263/how-to-create-an-os-x-lion-ins tallation-disc
How to clone your system:
http://macperformanceguide.com/Mac-HowToClone-backup.html
http://macperformanceguide.com/Mac-HowToClone.html
http://www.macupdate.com/app/mac/7032/carbon-copy-cloner
http://www.macperformanceguide.com/blog/2012/20120711_2-MacPro-internal-clone-ba ckup.html
The DVD is dependent on your hardware. And your hardware changed. The drivers for the 5780 and 6xxx are bundled in the OS and lacking. Minimum build thing.
Put the new drive anywhere you want. Does not matter. Can move it later. Can be drive bay 0-3 or a Firewire external or under the DVD drive.
When you clone pull the old drive and boot from the newly cloned.
After that keep a backup clone around all the time. Takes less than 10 minutes to do a smart update to copy just the changes to keep it current. So you have working copy of the system. I keep Clone "A" that I keep "as was" the system as of last month or whatever (like 10.7.4 before upgrade to 7.5).
Comes easier after doing it once and have all your ducks in a row.

Mac Pro 2010 Won't boot after adding Ram

Just got my Mac Pro 2.8 a few days ago. My 4x2 8Gig Crucial Ram upgrade arrived today along with my SIIG FireWire400 PCIe card. It seems as though the Mac Pro won't boot with both the Crucial Ram and the Samsung Ram that came stock with the Mac Pro. I kept 2 of the 1 gig Samsung chips and put in the 2 4Gig Chips from Crucial. They are all the DDR3 1066 240 pin chips. I've moved the 4Gig chips to slots 1 & 2 and I've tried them in slots 3 & 4. I've moved the 1Gig Samsung chips accordingly. The power light on the Mac Pro blinks continuously when they are both installed. I even tried removing the new SIIG FireWire 400 card but that doesn't change anything. It seems as though combining these two types of ram just doesn't jive. Any ideas? I'm dragging the tower from queens to SoHo tomorrow to let the Apple Genius gang have a look at it.

FYI, when I did install the Registered or "buffered" 8 Gigs of Crucial Ram by themselves the system did boot up normally and a memory notification popped up and said that my ram was in the "correct" or "suggested" configuration. I can't remember the exact phrasing but the OS definitely gave me a thumbs up. So now I am trolling the web trying to find out if the Registered memory is ok. I'm fine to just have 8gigs for now. But don't want to jeopardize the stability of my system. So, Is it ok to use Registered memory and if it is, am I using a lesser quality of ram in doing so?

Mac Pro 2006 won't boot after attempted cpu swap, Mac Pro 2006 won't boot after attempted cpu swap

I just picked up a used Mac Pro 1,1 (2006). It has 2x2.0 GHz dual-core processors and 5GB of RAM with the 7300GT card.
In this configuration, the machine was running perfectly. I, of course, wanted to upgrade....
I ordered a pair of 5160 3.0GHz processors cheaply and followed a video tutorial to install them. I used Arctic Cleaner and Arctic Silver 5 for the thermal paste.
Bottom line is: I installed the two new processors and when I fired it up, I could hear the fans, optical drive and hard drives all spinning (normal fan speed - NOT "jet mode", and the HD sounds like it's spinning - NOT like it's booting). NO boot chime and NO display. I popped the cover off and saw the CPU B FAIL light on. I swapped CPUs to test the processor, expecting to see the CPU A FAIL light come on. It did not. It just powered the fans/drives with no result (again, with no boot chime and no display).
To make a long and frustrating story short, I wound up putting one of the original 2.0GHz processors in slot A, leaving B empty (maybe I damaged the socket?) and IT STILL WILL NOT BOOT. I have tried all of my processors - the original 2.0GHz and the new 3.0GHz ones - with the same result. There are NO symtoms or indications - no error LEDs, no beeps - no indication why this machine will not boot.
I have reset the SMC, pulled (and replaced) the coin battery, and left it unplugged for over an hour. I have re-seated everything I can think of.
As of rigt now, I can hear the fans quietly humming with the optical drive making a quiet "click" sound as it seeks for a disk to read, and I can hear the faint chatter of the HD head. The power LED is nice and bright (no flashes or pulses), and there are no red LEDs on inside the case. The memory LEDs flash once during bootup and that's it (it's the RAM the machine came with). Pressing the DIAG LED button tells me the machine has power (green LED), has trickle (yellow LED) and the GPU light flashes green.
Of note, during the swap, I got a tiny bit of thermal paste (non conductive) on the contacts of my 2.0 CPUs - which I cleaned off with alcohol and let dry. The gold contacts all appear to be good on the original processors. I can't really see the tiny little pins in the CPU sockets (my eyes are not as young as they used to be!), but the "look" like they're all there.
I'm going to leave this unplugged overnight, but does anyone have any ideas?? If I managed to somehow destroy ALL of the CPUs, wouldn't I get a warning LED or beep or something? Ideas are welcome, as I cannot afford to replace this machine - it has to get me the rest of the way through college.
thanks
Richard

Hello Grant
>
Hardware sets the fans to maximum, and only properly-operating software resets them to "normal levels. If you have fans at normal levels, some software is running.
>
That's what I was thinking, but I'm not even getting the startup chime, and the HD sounds like it's powered on but not doing anything.
EDITED TO ASK: what software could be running at this point? Nothing has loaded from the HD, that much I know...
>Do you still have CPU A or CPU B failure lights?
No. I have just one original processor installed in the CPU A socket. No lights of any kind. (Even if I install an original processor in CPU B, I still occasionall will get a CPU B FAIL light, so I'm thinking I damaged the socket somehow...the light will not be consistent, but it's always the CPU B FAIL light - the light only turns on some of the time (and stays on once lit) - so that's why I pulled the B processor and am simply trying to boot with A alone)
>Do you have a flashing power on light, indicating failed or no memory?
Again, no. I can "make" the light flash by removing the memory riser, but when I re-install the riser, the light stops blinking (with power off during removal/install, of course!)
>Have you done the more severe SMC reset with the reset button OR:
unplug AC power.
Yes. I have used the SMC reset button 3 or 4 times. I unplugged the machine and left it (with coin battery installed) for an hour. The last thing I did last night was that I left it unplugged overnight (with coin battery removed). I have yet to attempt a power on this morning. I will do so and report back.
>
unplug AC power.
Press and hold power-on for a quarter minute to drain the power capacitors.
Re-plug AC power.
wait a quarter minute.
then power on.
>
Haven't done that one yet. (Didnt know about it!). Will try that second today, after attempting the initial boot up after leaving it unplugged all night. (fingers crossed) Of course, the capacitors are likely discharged now after being unplugged and battery-less all night, but you never know...
>Many things have to get synchronized after a CPU swap. It may take a half-dozen reset attempts before everything lines up again and goes.
Thanks for the hope. I will keep trying.
>
I recommmend you remove ALL distractions: all drives, all graphics cards, all PCI cards, all USB devices -- until you get the chime nothing else matters.
Already have done so. Last night I was down to 1 original CPU (CPU A), one memory riser with 1 set of original 1GB DIMMS, 1 bootable HD and nothing else (not even a keyboard/mouse - literally NOTHING else). Will keep trying in this configuration. All I really wanted last night was to hear the "bong" at power on!
Will do a bit more troubleshooting today and will report back.
Thank you!
Richard
Message was edited by: Richard Williams Jr

Mac pro 2006 won't boot after lion install

hi,
under 10.6.8 everything worked fine. All adapters and peripherals were functional.
After a normal looking lion install my mac pro 2006 will not make it past the boot screen (Grey Apple logo with spinning wheel). After a while the spinning wheel stopped spinning but I hear disk I/O continue for some time. A verbose boot lists the usual output. The last line visible has a mention of macos_swapon or something like that. I do note the first couple of lines specify a 64 bit kernel is booting. I was under the impression that this machine cannot run the 64 bit kernel from snow leopard discussions.
The video card is an upgraded one (i.e. not the stock card that came with the machine). However as I said before it was working fine under snow leopard.
Any ideas?

I have the same problem. I did a clean install of Lion and created a temp account. I was able to use Lion for a bit, then I used the Migration Assistant to bring my regular accounts back in from an external drive. When that completed I logged off of the temp account and into my main account (without restarting). Still no problems, Lion was working fine. I shut the Macbook down for the night. Now that I'm powering it on the next morning, I only get the Apple logo and spinning wheel.
I tried a PRAM zap, but it didn't help.

Mac Pro 2008 won't boot past spinning wheel

I have a Mac Pro from late 2008 which turns on, makes the startup sound, and remains on the spinning wheel for about 30 seconds before the wheel freezes. I have Windows 8 installed on another internal drive and I can't boot past their version of the spinning wheel, either. I've tried booting off of the install disc (Snow Leopard, which is what the machine is running) and off of a USB stick with a Snow Leopard .dmg on it, neither of which have worked.
I've done all the steps to fix a drive error, so I don't think it's that. I've read that it could be a graphics card error; has anyone else experienced trouble with theirs? Mine was a GeForce 7300, if I remember correctly. Thanks in advance.

It certainly sounds like a graphics card problem.
User Tip: Mac Pro silver tower (2006-2012) Replacement Graphics cards

Mac Pro 2009 8 core with an endless cycle while booting up

Dear all,
My Mac Pro 2009 edition (2.26 GHz,8-cores) is suffering from a weird situation which I can't solve, so I post the message and hope someone can help me to find a solution.
On Monday Morning, I found the rainbow cycle is running behind the screen saver after shifting my mouse. The Mac Pro was not responding (can move mouse), so I pressed the button for 5 secs to shut it down. Then, I pressed the start button and saw there is a folder with question mark on the screen. After looking several web pages, I realized that it might be the RAID is failed for some reasons. I used the OS X installation disc to boot up and found that the RAID card was not recognizing the original RAID 0 build while the RAID card was shown to be healthy. I decided to restore my system from the time machine (WD Green 2TB x2, RAID0), so I checked the content of the time machine and hoped that I can find since when the machine is not responding. Then, it was 5:36PM on Friday, the last backup (backup per hour). So, it has been freezed for more than 2 days right after I left my office! Anyways, I used RAID utility to rebuild the RAID 0 (1TB x 4) and started recovering the last backup. After 11 hrs, the restore had been successfully done, so I clicked the restart button. However, after booting up, I got a grey apple and a running circle below it. The loading screen remained for 10 hrs and wouldn't get in.
I sensed that there is something wrong. It couldn't be fixed by simply restoration by time machine. Therefore, I started exhaustively surffing the internet and looking for an answer. Here are things I have tried but didn't work:
1. Restoring from three different time points: last time point, 1 hour before the last time point, and midnight on Thursday. Not working.
2. Remove Mac Pro RAID Card and use Disk Utility to build SoftRAID 0. Not working.
3. Remove ATI Raedon 5770 and replace with the original GT120. Not working.
4. Use Apple Hardware Test from Application installation disc to perform both default and extended tests. Found no problems.
5. Replace SDRAM with the originial 6GB (1GB x 6) SDRAM.
6. Tried reseting PRAM (3 to 4 times each)
7. Tried reseting logic board by following the instructions from macusersguide (http://www.macusersguide.com/2009/06/reseting-the-logicboard/).
(*)8. I tried to boot from another HardDisk, which I installed Win7 on it a few months ago (including all needed drivers for the Mac Pro). It is an originial Win 7 and it works! I also tried to test the 4 HDs by using the windows experience index. I tried 5 times (1 disks individually and all 4 disks enabled). All tests passed.
So far, I can only conclude that the hardware seemed fine, and it could be a software thing which blocks me from getting into the Mac OS.
I have been working on this for 3 days, and I am really tried. Could someone help me addressing this issue? Is there anything I can do to test which part is doing wrong? Should I test more time points in the time machine? Should I just hand my Mac Pro to Apple retail stores and asking for fixing (apple care expired and they would charge fees..)?
Thank you so much

Frankly, if you want a reliable backup from which you can boot the computer, then don't use TM. Use a backup utility that makes bootable backups starting with the Restore option of Disk Utility. Here are others:
Backup Software Recommendations
Carbon Copy Cloner
Deja Vu
Silver Keeper
MimMac
Retrospect
Super Flexible File Synchronizer
SuperDuper!
Synchronize Pro! X
Synk Pro
Synk Standard
Tri-Backup
Others may be found at VersionTracker or MacUpdate.
Visit The XLab FAQs and read the FAQ on backup and restore. Also read How to Back Up and Restore Your Files.

2009 Mac Pro Quad Will Not Boot

Hi.
I have a 2009 Quad 3.0Ghz Mac Pro that will not boot up.
I went to it this morning and the beach ball was spinning. I could not get it to stop and as a last resort, turned it off. It has been working fine, although
I have noticed a little slow (Could be me, though).
When I tried to reboot it, it tried to start, chime went off, but it stayed on the light grey screen and eventually, it had a folder with a question mark in it
that blinked.
I disconnected all peripherals, no change.
Tried to boot from the optical drive with Disk Warrior, no change.
Anybody have any ideas?
Thanks in advance for any help.
Brian

The Chime is generated in Software when the first part of the Power-On Self Test has passed. If an appropriate source of software can be found, booting is likely.
it had a folder with a question mark in it that blinked.
That says it could not find the last-specified source of software. the drive may be damaged, or it may have forgotten where it should be looking.
Tried to boot from the optical drive with Disk Warrior, no change.
Next try a 10.6 DVD. "A Mac that cannot boot from an appropriate Installer/Utilities DVD has a Hardware problem".
One of the simplest things it should be able to do is Startup Manager. Hold down the Alt/Option key at startup and it should draw a gray or blue screen and slowly draw an Icon for each potentially-bootbale device (including a bootable DVD, if inserted).

HD 7970 video card for Mac Pro 2009

I just wanna buy one HD 7970 3GB for my 2009 MAC PRO. Do you guys flash the card or does 10.9.2 natively support HD 7970 diver? I've been looked at some HD 7970 cards on ebay, just confused with the power cables, some has one 6 to 6 pin and 6 to 8 pin cables. Others has two 6 to 6 pin cables. I don't know which one to buy is safe.
Here is the link:
http://www.ebay.com.au/itm/141058814...84.m1438.l2649
http://www.ebay.com.au/itm/231169142...84.m1438.l2649

yes-i agree with what kaz-k has written. As long as you get the correct power cables for your graphics card you should be okay. I think the Mac Pro has 2 6pin sockets. We don't flash the card ( thought I'm assuming it could be done elsewhere) , and Apple doesn't support anything other than a few graphics cards anyways, and it doesn't really read what's been posted here. here's the takeway: The card will probably work, however, due to the lack of a Mac EFI (basically a boot rom), you won't see a startup screen should you choose to install the card into your mac pro 2009. As the OS gets going you will see graphics. Should you need to do basic troubleshooting, eg choosing which drive to start up from
(command R on startup, I believe), the lack of a boot screen could be troublesome. If you don't care about that, by all means go ahead. 10.9.2 should have support for this card. If it helps, I bought a Sapphire 7950 for my Mac Pro 2008 (3,1) and although it doesn't run at quite full speed, it was a breeze to install, and it beat the 8800GT which was in that slot
good luck
John B

Mac Pro 2009 audio problems

Hi there.
I have a mac pro 2009 quad-core intel xeon and since i've updated to 10.7.3 i've started to have problems with audio.
Sometimes when i turn on the mac, the audio doesn't work (the audio icon in the menu bar is shown grey, and if i try to rise the volume using the keyboard it doesn't work.
I've tried to get inside the audio preferences and select a different audio output like the internal speakers (i currently have speakers connected into the jack output) but it doesn't work too.
The only way to resolve this seems to do a RAM reset during the boot, but it's very annoying do this every time.
Anyone can help me to resolve this? Is it a software problem? Or my logic board is going to die?
It never did anything like this before the update.
Thanks for the support and forgive me for my bad english.
Greetz,
Lorenzo

I'm having similar problems with a brand-new Mac Pro 8-core. Mouse cuts out (I'm using a wired keyboard thankfully) and my Jawbone headset will work wonderfully with my old MacBook Pro but will only pair (maybe) on my Mac Pro.
Called and spoke with an expert and feel I get the run around. He had me shut down and unplug everything for 30 seconds. I did it but felt he was just having me "do something" to get me off of the line.
Apple has a problem with Bluetooth on their Mac Pros and isn't dealing with it.

HELP! Upgrading Graphics Card on Mac Pro 2009

Hi all,
I'm interested in upgrading my current graphics card NVIDIA GeForce GT 120 512 MB to something with more memory.
I'm having a hard time trying to figure out which brand to go with that'll be compatible with my Mac Pro 2009 model and will work well under OSX Mavericks.
I really dont want to break the bank. Need a good amount of GDDR5 ram for Adobe Creative Cloud mostly. Would also like to run some gaming on PC Bootcamp drive under Windows 7 (Titanfall, Crysis, Battlefield, etc). However that's all secondary, thanks for your help.

LOTS of choices, depends if you want ones that will work without fuss (ATI 5770 & 5870 plus Mac edition EVGA 680 and Sapphire 7950) still give you boot screens if you option boot.
If you don't care about boot screens, you can use almost any recent ATI or Nvidia card. If you only boot into OSX, you can live without boot screens.

How many Sapphire Sapphire RADEON R9 270X can i install in my mac pro 2009?

How many of the graphics cards can I install in my mac pro 2009? Sapphire Sapphire RADEON R9 270X
Thanks

Why? do you use FCP-X? that will benefit from two. Also gaming in Windows where you can use Crossfire
You have two 6-pin power feeds so you will need a small 450W PSU - those come with two 8-pin and two 6-pin.
Those can often fit in the optical drive bay and cost $25-75 range.
"500W" is NOT for the card! that is the minimum PC PSU only!
when buying look for card that uses only two 6-pin and not an 8-pin power.
75W for the PCIe slot, and 150W from two 6-pin cables, most GPUs fall into the 200-250W at maximum stress levels8-pin is basically two 6-pins and 150W feed
> we CrossFired a pair of Radeon R9 270s in our 2010 Mac Pro tower. Under Windows 7 64bit Ultimate, it registered 145 FPS in the Diablo test.
http://barefeats.com/tube06.html
Keep in mind that the Mac Pro tower can't feed enough power to the dual 980s, dual 290Xs, or dual 7950s.
We used an auxillary power supply to compensate.
For the hard core GPU rendering, there are external expansion boxes with their own power supplies.
In an earlier article, we featured the Cubix Xpander which facilitated the connection of 5 GPUs to the Mac Pro tower.
If you favor an AMD GPU like the Radeon R9 290X, MacVidCards can modify it to run at PCIe 2.0 bandwidth in your Mac Pro tower.
The Sapphire Radeon R9 7950 Mac Edition is available from OWC and TransIntl.
February 6th, 2015 -- Dual GeForce GTX 980s vs other Dual GPUs running multi-gpu 'aware' apps
February 6th, 2014 -- (UPDATE) GeForce GTX 980 GPU versus 8 other GPUs running Games and OpenGL Benchmarks
January 29th, 2015 -- GeForce GTX 980 vs 9 other GPUs running Resolve, LuxMark, and Octane Render
December 28th, 2013 -- Does Final Cut Pro X 10.1 render faster on Mac Pro towers with Dual AMD GPUs? What about Motion 5.1?
Things to keep in mind:
The Radeon R9 280X we used was 'un-flashed.' It booted OS X fine but there was no startup screen. Also, when we checked the speed of CPU-to-PCIe-to-CPU communication, it appeared to be running in PCIe 1.0 mode instead of PCIe 2.0. However, unless the GPU intensive app saturates the PCIe 1.0 bandwidth, it will not run any faster in PCIe 2.0 mode. http://barefeats.com/tube12.html
Which is one reason why you might want to buy pre-modified cards from http://www.macvidcards.com

Mac Pro 2009 won't boot.

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