Adding memory modules...

I am currently running leopard on a 1st generation Mac pro with 4GB of ram from ramjet.com. I would like to add more ram to to it and am a little confused. To get maximum performace, I unerstand I fill all the memory slots. I am thinking about adding 2x2GB modules (replacing 2x512MB). Will this be ok? to have 7GB of RAM? will this still take advantage of the 256 bit addressing? Thanks.
John

In order to take advantage of quad-channel interleaving you must install RAM in equal-sized quads, e.g., four 1 GB DIMMs, four 512 MB DIMMS, four 2 GB DIMMs. Having four modules of differing sizes does not do the trick, although you must install RAM at least in equal-sized pairs.
I assume you currently have two 512 GB DIMMs and two 1 GB DIMMs giving a total of 3 GBs. You could replace the 512 MB DIMMs with two additional 1 GB DIMMs giving you a total of 4 GBs as an installed quad of equal-sized DIMMs. You can then populate that other riser with four more DIMMs of equal size. You could install four 512 MB DIMMs (thus using the two you already have) giving you another 2 GBs for a total of 6 GBs.
Get the picture?

Similar Messages

HT1423 I am adding more memory, should I replace the top two slots with the 4g memory modules, then place 2g memory modules on bottom slots. Does it even matter?

I am adding more memory, should I replace the top two slots with the 4g memory modules, then place 2g memory modules on bottom slots. Does it even matter?

I am adding more memory, should I replace the top two slots with the 4g memory modules, then place 2g memory modules on bottom slots. Does it even matter?

How to export imovie09 to an external harddrive prior to adding a new memory module?

Had to add a memory module to increase memory so I can run Lion, but can't back-up all imovies to external hard drive as required. What to do?

You can import the photos into iPhoto by using the iPhoto File menu "Import to Library."
The default location for the iPhoto Library is username/Pictures/iPhoto Library
You should only work with the library using iPhoto (i.e., don't attempt to open the library and work with the files inside directly from Finder).

Matching Memory Modules?

I recently bought a new iMac G5 with a 1GB memory module pre-installed. I have added a 1GB memory module and I am wondering if there is any way for me to tell whether the memory is matched, that is, operating at a 128-bit data path. I read about matching memory here http://docs.info.apple.com/article.html?artnum=300082 . I am mainly wondering because after installing the module I have not noticed any improvement in speed or performance. The additional module that I bought is by Crucial (part # CT12864Z40B.M16FD). The factory installed module is by Micron (part # MT16VDDT12864AG-40BD1). The new module that I received looked physically different from the original one - it is more narrow and the chips are smaller and square (vs. the rectangular chips on the originally installed module) but all of the technical specifications listed for it were the same as for the one originally installed in my system. So I donÕt know if that would make them not a Òmatching pair.Ó In the system profiler it does say that there is a total system memory of 2GB but I canÕt find any information as to whether the data path is 64-bit or 128-bit. How can I find this out?
Thanks very much for any help,
Wade

Hello All,
I ordered a second 1 Gig DIMM for my iMac G5 (rev. B) on Monday. My original module was a PQI brand 1 Gig with 16 chips (8 on each side).
The new one that arrived, is a generic assembled with Motorolla chips and also has 16 chips (8 on each side).
I spoke with the guy on the phone at Other World Computing (the place I purchased the original module from and the new module).
I explained to him that I wanted to end-up with a "matched" set that would provide the 128-BIT communication.
He told me that he would look up my original order, and get me a module that would match.
I mentioned to him that I had heard that the modules needed to be identical if they were to be recognized as a matched set and be utilized with the 128-BIT path.
He told me that you don't really need to go that far. He said that they just need to be the same size (capacity) and speed.
My modules do appear to be "matched" according to the Terminal Script, and the "testgbusG5us" utility I mentioned previously (see other post). So, they are reportedly communicating at the 128-BIT rate.
In my system Profiler, the original PQI module is listed as:
PC3200U-30330
The new generic module is listed as:
PC3200U-30440
So, they appear to not be 100% identical, but they are recognized at a "matched" set.
I haven't been able to find a translation on the Internet for the numbers after the dash. But, the limited information I could find indicates that the first number "3" in the 30xx0 number is the CAS rating.
So, it appears as though they are the same size and speed.
Anyone know what the other numbers mean?
Anyway, I thought I would post what I found for the benefit of others who are thinking about buying another module.

3 memory modules?!?!

I'm currently using two 512MB memory modules in dual channel. i want to add more ram to my machine, but i want to keep the pieces that i currently use. so my question is, can i add one more module (1 GB) so that i will have a total of three modules (2GB), or adding the third module will cause instabilities and i should stick with even number of modules (2 or 4)?

it will probably not work in dual channel mode, if your cpu is smart enough to drop back to single channel mode it might work but you'll lose performance...
afaik there is no option to force single channel on that board, so if your system tries to run dual channel mode on that combination it's almost surely in for some memory errors...

Mix memory modules

Hi,
I have two 2 GB memory modules that I pulled from my Mac Mini.
Since they are just sitting around, I am wondering if I add them to my iMac that has two empty slots, will give me any performance boost.
The iMac currently has two 8 GB memory modules.
Adding two the 2 GB would make the total go to 20 GB.
Will this help in any way?
Is there a certain order in which I should install these modules?
Thanks
Raj

We cannot say without know the exact model of the Mac Mini. Even though RAM modules may have the same form factor and number of pins, you cannot use RAM rated at a lower speed than that of your iMac's RAM.
You iMac requires 204-pin PC3-12800 (1600 MHz) DDR3 SO-DIMMs
Late 2012 and newer Mac Minis use the same RAM. If the Mini is older, the RAM will not work.

IMac G5 system hang - 2 bad 1GB memory modules?

I am experiencing intermittent system hangs, requiring power off / on to recover. Applications run fine for hours, then everything freezes; a few seconds later the fans spool up full bore. There seems to be no logic to the failure. It happens on many different applications, including Disk Utility. No new software has been added recently (other than Apple software updates). This has been occuring for several weeks.
I repair permissions & run disk verify. When disk utility runs completely without hanging (on verify), everything is ok.
Applecare had me trash the ~/Library/Caches & system caches. No joy. They recommended archive & install beginning with Panther. Reinstall went ok until downloading updates for 10.4.8, then hang (might this suggest a hardware prob?).
Rebooted in target firewire mode the cloned drive, then zero'ed the G5 HDD and restored from clone (SuperDuper!). Everything appeared ok for several days, then the same system hang reappeared. I should mention that in the course of sudying this one, I discovered Virex 7.5 was sucking the processing life from the G5; used the uninstaller to get rid of it & the iMac is quiet again!
I have run the Applecare version of Techtools and the Hardware Test Disk, everything passes.
I could do a clean install of Tiger, then use migration assistant to move data from the clone...if I felt it had a chance to solve it. On the other hand, maybe its a flaky hardware gremlin and I'm wasting my time doing reinstalls, and I should hustle it over to the local Apple store.
Update - took iMac for service at Apple store where it failed under stress test with my 2 GB of memory but ran for an extended period with Apple memory. In an attempt to isolate which of the two 1 GB modules was bad, removed one module. Identical failure after 24 hrs. Howver, swapping out that failing module with the second module, identical hand. That suggests either both 1 GB modules are bad (unikely), or some other hardware issue is the problem.
Problem seems to occur most often when starting playing iTunes, or running Disk Utility (repair permissions).
I suppose the next step is to buy 1 GB of memory from Apple and make it fail again. Any suggestions?

Thank you for your posts, I appreciate it.
Skip - I tried a spare keyboard & mouse. Still failed.
MGW - all software is up to date.
DaddyPaycheck - I downloaded memtestosx. It fails testing each 1GB memory module separately (in different sockets). I'm running in multiuser mode and when it fails the entire iMac freezes up (just like it always does), requiring power off / power on. Is this normal behavior when the memtestosx test fails?
I will plan to test in single user mode as the supplied doc states that if the onboard cache is failing it would pass singleuser (cache apparently disabled in singleuser mode) but fail multiuser. Maybe the onboard cache is bad?
Thanks.

Powermac flashing status light error and adding memory boards

I bought a used Powermac G5. So far it won't boot, there is no image being delivered to the monitor, and the fan revs like a vacuum cleaner. At first the status light gave series of 3 flashing lights which the online manual (I don't have the specific manual for this machine) says is incorrect memory board or similar message. However, last time I turned on the Powermac the status light now gives single flashes which diagnostic meaning is not even mentioned in the online manual I am using. Does anyone know what single flashes mean? As far as the memory boards are concerned, what is in there now are: Apple memory module M9296G/A (Samsung PC3200U 30331 0413 256MB DDR CL3) in both inner slots, and Hynix PC3200U 30330 0411 256MB DDR 400Mhz CL3 in both second to inner slots. Are these the correct boards? I have on hand 2 other boards from a broken iMac G5. They are Edge Tech 1GB 5380601-40. Can these iMac boards be added to what is in the Powermac or substituted for two of the existing matched boards if they are the wrong type for the Powermac? Both the Powermac and the iMac run Leopard OS. I have also ordered a new battery for the Powermac. The existing battery is dead. Could that cause flashing status light? Thanks.

Hello, which exact G5?
If you don't know the model, find the Serial# & use it on one of these sites, but don't post the Serial# here...
http://www.chipmunk.nl/klantenservice/applemodel.html
http://www.appleserialnumberinfo.com/Desktop/index.php
How to find the serial number of your Apple hardware product...
http://support.apple.com/kb/HT1349
If you're sure the RAM is good, try the Hair Dryer trick...
http://discussions.apple.com/message.jspa?messageID=13240047#13240047
https://discussions.apple.com/message/15223603#15223603
https://discussions.apple.com/message/15499912#15499912
https://discussions.apple.com/message/15613068#15613068
https://discussions.apple.com/thread/3270112
https://discussions.apple.com/message/16053892#16053892
No power light at all...
https://discussions.apple.com/thread/3692775?tstart=0
It can show on any G5, and even many other computers & electronic devices of the period.
http://www.macintouch.com/reliability/pmg5.html
http://lowendmac.com/ppc/power-macintosh-g5.html
And see this last one in particular...
https://discussions.apple.com/message/16781690#16781690
Heat gun better...
https://discussions.apple.com/thread/3916312?tstart=0

Using Old Memory Module For New Netbook

I just bought a Toshiba NB505 netbook. I'm wondering if I can take one of the modules out of my old compaq presario and use it in my new netbook.
(The compaq runs on XP.)
If not, can you recommend a 1gig module I can buy.
Thanks,
Randy Kadish
Solved!
Go to Solution.

mini notebook NB505-N508BL
No, Randy, you cannot use your old memory. RAM modules are seldom transferable.
I recommend that you obtain yours from Toshiba or buy the best that Kingston makes.
   Toshiba 2GB PC2-6400 DDR2-800MHz Module
   Kingston KTT800D2/2G 2GB 800MHz Module
See the section Adding memory (optional), which begins on p. 40 of the User's Guide.
   NB500 Series User’s Guide
-Jerry

Added memory -computer freezes

hi,
i added 512 memory to make it 1 gb . it recognised the memory but freezed up after about 1 or 2 minutes .i tried restarting about 10 times ,the same thing happened every time .i then removed the new memory and everything is back to normal.have i got a dodgy memory module? i think i installed it correctly because it was recognised .any ideas .
thanks

Hello Michael
Yes, you have a dodgy memory module. Where did you purchase it? If you can, return it and get one that works. If you bought it from Apple or a reseller that supports Apple, that shouldn't be a problem. If you bought it from somewhere online, I would suggest e-mailing (or calling) them and letting them know the problem.
Richard

K8N Neo4 Plat - added memory - no OC - help!?

Hello,
I added 2 additional 512Mb sticks (TWINX1024-3200C2) to existing 2x512 of the same (for total of 2Gb).
First off - the system didn't post. Reset BIOS - posted. However, now I cannot overclock to where it was before.
Was - 240 FSB, HT Freq 4x, CPU ratio x9. Mem clock 166MHz, 2.5-3-3-7 1T --> CPU clock 2160, DDR clock 200
Now - I can only go up to 230 FSB with the same HT and CPU ratio - I had to change mem to 3-3-3-8 2T (wouldn't post otherwise)
Any idea how to speed it up a little more?
Thanks!
--max

Thanks!
OK, I kinda figured 2T point by myself (it wouldn't post with 1T no matter what).
Memory is way below 200MHz..
Oh.. well.. I guess I'll just give up and RMA it... Should've read this forum before buying..
Quote from: Quadrifoglio Verde on 21-March-07, 17:27:32
The s939 Athlon64 revision E memory controller officially supports 4 memory modules at 200 MHz (DDR400) and a 2T command rate only, 1T is just not possible anymore. On most boards even DDR400 is too high, you might have to fall back to DDR333 to run a stable system. Bottom line is that 4 memory modules is just not the way to go on an Athlon64, it will seriously limit your overclocking possibilities and memory performance.
If you really want to give it a go with 4 modules, you can try to play around with high memory voltages (at your own risk of course). It might help you to get it stable at DDR400 at acceptable latencies. Forget about running a 1T command rate though...

Mixing memory modules on Westmere

Dear Hardware gurus,
I have a 12-Cores Westmere. Do you know is it possible to mix different memory modules on it, namely:
6x1 Gb 1330Mhz
+
2x4 Gb 1066Mhz
and if yes, in which configuration?
Thanks a lot for any comment!

Kappy, thanks for the note.
I am actually going to order some more 1333 modules, but just for the short time I have to work with what I have currently (see my original post).
As I posted above, I tried a bit already to combine the modules and Mac doesn't boot
Can you suggest a configuration, which will work?

Memory modules and hard drive not recognized

I removed and reinserted the factory installed Satellite L505D-LS5007 laptop hard drive and memory modules just as practice for installing a hard drive upgrade and an 8GB memory upgrade. The problem is obviously with the memory and not with the hard drive.
After the first practice try, one memory module was recognized. Also for a few seconds after the first practice try, I ran the PC with the battery installed, but no memory installed. I did not look in the User's Guide first to see that I should have removed the battery before removing the memory.
Now the System Indicator Lights for the HDD Activity and Memory Card Reader do not light up. The PC turns on and the display is solid black with no messages.
Before buying new memory modules, what possible ways might there be to get the PC to recognize the factory installed memory modules and hard drive again?
Solved!
Go to Solution.

When troubleshooting, I always change one variable at a time. I would hate to miss a solution by being in a hurry. In this case, you may have damaged either the RAM or the RAM slot. I would stick with the Toshiba specifications for the RAM, making sure it is the correct size, speed and type recommended. I also recommend that when you replace the RAM that both modules be from the same manufacturer, size, and specification. Try one RAM module in one slot and then the other. And then try both RAM modules in both slots. After the testing you should be able to figure if this is a RAM problem or a RAM slot problem.
In the case of hard drives, the real test is whether or not the Bios sees the hard drive. If the Bios doesn't see the hard drive, it's not going to work. The Bios should see the hard drive whether or not the hard drive is partitioned, formatted or has data on it. My experience has been that many Toshiba laptops will work fine with larger capacity hard drives provided they are the same speed in RPMs, have the same interfacing connection and physically the same size.
Again, prior to doing any work on your computer, make sure that both the AC power has been disconnected and the battery has been removed. Be careful out there. A blown repair job by a non-Toshiba tech is NOT covered under warranty.

Memory modules for Msi Big Bang trinergy

Hey forum,
i want to buy some memory modules for my trinergy mobo because the ones i had earlier also proved to be incompatible. I would like to ask you if there are any memory modules besides the ones recommended from the MSI site concerning my mobo. I am looking for a 2x2 gb ram kit with a heat dispenser so it can work around 1600mHz. Thank you in advance
P.S Is the list on the site the only one? i mean are there any updated versions of it with more high end memory modules tested?

Ideally you would provide us with your fullsystem specs first >>Posting Guide<<
From a memory perspective, the reason these modules have heatspreaders is mostly due to marketing and to impress the potential buyers. The secondary reason is that most manufacturers sell you overvolted and overclocked 1066 or 1333 chips on a 1600 marketed module that needs 1,65V instead of the standard 1,5V. Your memory controller is part of the CPU and natively only supports 1333 at 1,5V.
If you really insist, then at least get yourself a 1600 kit that does this speed at 1,5V. One of the modules that seem to work well are the CMZ4GX3M2A1600C9 from Corsair. From a user perspective, the mem modules from Crucial that you see in my signature come highly recommended as they have been proven to work on the P55 platform whenever used.

Mixing memory module of different sizes in G5-8 slot machine

is there a problem with Mixing memory module of different sizes in G5-8 slot machine
I have 2gb on four slots with 512 memory chips
Can I upgrade my memory with 1gb chips in the remaining four slots.

Hi epospiech-
Yes you can.
Instructions here: Memory (DIMMs) Replacement Instructions
Luck-
-DaddyPaycheck

Adding memory modules...

Similar Messages

Maybe you are looking for