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

Similar Messages

Mixing memory modules of different sizes in a Mac Mini

I have a MM Intel Core Duo with a 1.66GHz processor and 512 MB 667 MHz SDRAM. Model Macmini1,1, 32 Bits, SMC Version (system): 1.3f4.
Anybody know if you can mix memory modules in it? I have the standard 256 modules (2) and would take one out and replace it with a 1 GB one. Can this be done?
Thanks

+Anybody know if you can mix memory modules in it? I have the standard 256 modules (2) and would take one out and replace it with a 1 GB one. Can this be done?+
Yes, you can do this. You will get a slight performance hit on video, but that will be more than offset 99% of the time by the extra RAM reducing overloading of the Virtual Memory system.
However, it is enough work to replace the RAM and RAM is cheap enough, that I'd recommend putting in two matched 1 Gig modules instead.

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?

Mixing Memory Modules

I just bought the MacPro with a 3.0ghz chip and let them ship with the standard two modules, 1GB each of 800 Pro 8-core memory. I bought (at 4 All Memory) four 2GB DDR2-800FB DIMM modules. Is there a reason not to leave the original two 1GB modules in place and just add the new memory?

If there are only two modules in the computer, one goes in slot 1 in each riser. Otherwise, matched pairs go in slots 1 and 2 of each riser, and when those are filled, in slots 3 and 4.
If the computer came with just two modules, one must be moved to slot 2 of the other riser when adding more memory. If it came with more than two modules, you don't have to move any. You will get best performance if both risers match, but don't remove modules just to make them match. More memory is always faster.
If you have four modules of one size, and four of another, put the larger in slots 1 and 2 of each riser, and the smaller in slots 3 and 4. Slots 3 and 4 are slightly slower, since their signals pass through the modules in slots 1 and 2. Putting the smaller modules in slots 2 and 4 means most memory will be in the faster slots.

Can I mix memory modules?

I have some memory modules left over from various upgrades and I would like to use them to upgrade my daughter's iMac which is a 2.0 GHz machine using 667 MHz DDR2 SDRAM PC2-5300. I have 1 Gb of that memory from wife's iMac which is the same model but I also have 1Gb of 800 MHz DDR2 SDRAM 6400 from my own 2.4 GHz iMac. Can I install them together in my daughter's machine? If I can't mix them, will the 800 MHz run in it on it's own and would there be any benefit?
I also have some 667 MHz 5300 from my laptop which appears to be the same as that in the 2.0 GHz iMac. Can anybody confirm that? Finally, is there any risk in trying any of the above?
Thanks in advance
Ron

Teufelhunden,
Hi I know you're new so let me try to educate you a little. First is trying to ask a question in someone else's thread is considered rude, it's called thread jacking. I'm sure that wasn't your intent though. Next is if you see a green star by a thread that indicates it has been answered so posting a question in a thread that has already been answered probably isn't even going to be looked at.
I would recommend opening your own thread and I'm sure you will get some people more than willing to answer your question. If I see it I'll help you too! If you need assistance on how to create a thread click above where it says "Expanding your Intel-based iMac" and then you will see a link called *Post new Topic*.
Regards,
Roger

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.

W520 i7-2860QM with 2 memory modules and CPU-Z Reporting them as Slots 1 and 3?

Is this normal for CPU-Z (1.59, 1.60, 1.61) to report a matched kit pair of properly populated memory modules as Slots 1 and 3 in "dual" mode? One is under the keypad in the upper slot #0 while the other is in slot #1 under the chasis on the left closest to the DVD (with the black plastic frame).
Slots 2 and 4 in CPU-Z are reported empty.
I think this is okay and just the way CPU-Z is setup to report the SPD info but would like to double check out here with others using only 2 of their 4 memory slots.
I'm running a fresh clean bloatware-free Win7 Pro SP1 installed to my Samsung 840 Pro 512GB SATA-III SSD and holding at BIOS 1.36. I'm using 1600 speed 2x8GB Corsair Vengeance modules (a 2x8 kit with adjacent module serial numbers). Optimus and the integrated graphics are both disabled in BIOS and the unit never leaves its 170W Series 3 Plus docking station w/ external monitor, keyboard and mouse ..... it runs with the lid closed nice and cool, plus quiet also.
CPU-Z also reports I'm actually running at 1600 on the memory and I have thrown every torture test I know of at this configuration and have not had any issues yet over the last 6 weeks. Benchmark programs are also all on the very high end of the ranges published for W520 units ..... probably with a lot of help from that 512GB SSD SATA-III Samsung 840 Pro.
I never plan to ever use the on-board graphics, so I'm getting ready to install my other identical Corsair 2x8 kit next week and see if stability issues arise at 32GB using 4 modules ...... will hold at BIOS 1.36 unless things start happening at 32GB.
Thanks in advance for any input about the way CPU-Z reports pairs of memory modules.
Two (I used to have Five) - T61p 15.4" WS T9300 2.5Ghz units, August 08/08 Builds with FX570M Nvidia Graphics; ... One W520 i7-2860QM w/2000M Nvidia Graphics (most recent acquisition and stupidly fast); .... One - T42 4:3 15" Flexview 1.8GHz with ATI Graphics (still perfect for traveling); ... Two - T500 15.4" units both with ATI HD3650 Graphics.

Quote
Originally posted by Wonkanoby
if it drops that low rms the psu
Sorry for asking, but what's rms? I found nothing on google that seemed to fit in, but I guess you mean to get rid of the PSU and get a new (better) one.
I also ran memtest86 for 3+ hours and it seemed that one of my memorysticks was heavily corrupted.
So I removed that one and ran memtest86 again for an hour without any problems, but the volt keep dropping anyway... and the freezing-problem persists.
Hopefully I can purchase a PSU on approval and run some test.
Thanks for the quick answers guys!
edit: By the way, which brand do you recommend for the PSU? Right now I have Topower, cheapest one I could find when I bought my computer about a year ago (only bought the two extra memorysticks last week).

Would I be better off mixing memory modules in my iMac rather than just having 1GB unused?

I have a late 2006 20-inch iMac that currently has two 1GB 200-pin PC2-5300 (667MHz) DDR2 SO-DIMM modules installed. I recently bought two 2GB modules of the same type (different brand). Since I also have a macbook that uses the same type of memory (but 1GB total), I want to know how I can get the most speed with the momory I have for both computers (ie 4GB in an iMac that only recognizes 3GB and 2GB in the Macbook or 3GB in each). Thanks!

Matching 4GB in that iMac will give you a slight increase in preformance over 3GB.
see > Understanding Intel Mac RAM - Mac Guides

Toshiba Tecra 9100 Mix Memory and Hard Drive Size

Hello.
I have here an old Laptop Toshiba Tecra 9100 is it possible to Mix or Use DDR400 (PC3200) with Current Memory DDR266 (PC2100) or can i replace all memory and use all Slot DDR400(PC3200) since Tecra 9100 supports only DDR266 (PC2100) 2.5v while DDR400 (PC3200) is 2.6v? how about DDR333 (PC2700)since it has 2.5v
Second the Hard Drive is Dead can it support 120Gb or 320GB Mobile HDD PATA since current HDD now is 70GB.
Thank You

Hello.
I have here an old Laptop Toshiba Tecra 9100 is it possible to Mix or Use DDR400 (PC3200) with Current Memory DDR266 (PC2100) or can i replace all memory and use all Slot DDR400(PC3200) since Tecra 9100 supports only DDR266 (PC2100) 2.5v while DDR400 (PC3200) is 2.6v? how about DDR333 (PC2700)since it has 2.5v
Second the Hard Drive is Dead can it support 120Gb or 320GB Mobile HDD PATA since current HDD now is 70GB.
Thank You

HT1423 Mixing Memory Modules

My iMac 27" can take up to 16g memory having 4 slots. Right now I have 4G memory installed (2x2g ram). Can I add 2 x 4g memory in the vacant slots? Thanks!

As long as the memory you get is the correct type it should not be a problem.

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?

Thinkstation D30 memory modules

Hello,
I have a D30 with 2x Xeon E5.
I want to change memory to 32 GB.
In order to keep upgrading possible I want to use 16 GB Rdimms.
In the Manual is stated:
• If your computer has two microprocessors installed, install equal numbers of memory modules in both
sets of microprocessor DIMM slots for maximum performance.
That's clear, BUT is there a minimum of memory modules when you have 2x CPU's?
So will it work with 1x 16Gb module at CPU1 and 1x 16Gb at CPU2 ???
thnx again.
Solved!
Go to Solution.

You can certainly run with a single DIMM for each CPU.

Is it right to mix sizes of memory modules in a mac mini 2012? for example 2Gb 8Gb?

Is it right to mix sizes of memory modules in a mac mini 2012? for example 2Gb 8Gb?

Welcome to the Apple Support Communities
You can do that without any problem, always that the total amount of memory is less than the maximum memory your Mac mini supports. A Late 2012 Mac mini supports 16 GB of memory, and you can find in this site the steps to install more memory > http://support.apple.com/kb/HT4432?viewlocale=en_US&locale=en_US#1

[Intel] Mixing different size and brands of memory. MSI 6507 Motherboard.

Hello,
Does anyone know if it is ok to mix, firstly different size ram and secondly - different brands. I am currently using a 1x PC2100 512mb stick and 1x PC2100 256mb stick (Different Brands) and have never had any problems. However I am looking to replace the 256 stick with either another 512 or 1g, when searching on the net most of the advice is not to mix brands and always use pairs rather than different size sticks?
I have a MSI 6507 MB
Thanks

Hi
Using matched pairs is still the best way to go with memory but that doesn't mean that having different brands won't work. It is a crap shoot when mixing different sticks of memory. Sometimes it works fine but most of the time it causes problems.

Mixing memory size

Is it possible to mix different memory module sizes in an iMac 2010¿ I currently got the standard 2x2gb installed, but would like to add 2x4gb, making the total 12GB. Is this possible?

yes, thats fine.

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

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