Neo2 Mixing Memory Question

Currently running 2x512 Crucial Ballistix in slot 1&2 stock speed 2.2.2.5 - stable. I'm desperate for 2 gigs of ram but thanks to a nagging wife and lack of funds this isn't possible yet, but i do however have 2x512 Corsair value sticks (2,5.3.3.8) in an old machine which i can take out and put with the Crucial Ballistix to make to 2 gigs (4x512). I'd just like to know if mixing them is a good idea or am i asking for trouble.
Any advice, tips are most welcome

Hello Billy,
Your wife is not nagging you. She just has great looks and excellent computer savy and does not want you to buy or mix memory sticks.
Mixing memory stick as per your plan will only cause lost system performance and instability. You have a Winnie CPU so you will definately need to run at 2T. The timngs, voltages, and chipset of your ballistix and corsair sticks are quite diversed. I own four stick of Ballistix RAM made from different batches. Crucial professed that they do not have to worry about matching dual channel pairs but my own test here reveal a 140 to 176 megs bandwidth performance difference between newer and older pairs (older better). Using this has a comparaison you can just imagine what associating ballistix and corsair would be like.
In summary Billy, unless you are an Italian noble who like self-inflicted pain, is not to mix your crucial and ballistix Ram sticks. Work on the wife instead, wine and dine her, so that you can talk her into letting you buy 2 X 1Gig sticks of PC 400 Ballistix sticks.
Good luck with the frau,

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Mixing memory question

I currently have 2x512MB for 1GB of Crucial Ballistix memory sticks in my system right now. I am planning to buy 2x1GB for 2GB of Corsair XMS memory and mixing it with the Crucial stuff. The memory are to be used on my main system right now which is using a MSI K8N Neo4/SLI board at 2-2-2-5 timings with a AMD 3700+ San Diego core. The Corsair XMS memory can run at 2-3-3-6 timings so I don't believe it would be much of a problem running my Crucial stuff at 2-3-3-6 as well. With this setup all 4 memory slots would be full, and I'll have 3GB worth of memory. However, I am wondering if I would run into any problems using these two memory brands together. Are there any potential problems that I should be aware of before I buy the memory?

Find out what voltage each ram uses.
One might use 2.6v the other might use 2.75v.
Seeing as you cannot run each dimm at a separate voltage they should be of a similar voltage.
Otherwise one might be getting to much
and the other maybe too little
Either way could cause problems

865pe neo2-p Memory question

HI all
Hope someone can answer me a question
I have a 865pe noe2-p mobo , i have just stuck in x 4 1 gig ddr400 mem modules
The Specs of the board state as per MSI site that this board can support 4 gig , yet my bios is only reporting 3.1 gig
Mem modules are showing as dual channel in bios
Bios version is up to date ver 3.a , as per live update
CPU intell celeron 2.53 ghz clocked up to 2.92 ghz
4 gig Kingston DDR400 mem
Nvidea 6600
sata hdd's , 500 gig and 160 gig
is there something i am missing here to enable this board to see 4 gig of mem as per the specs of the board
I am only running XP and fully understand the SW limitation ,
I do not see this as being issue with SW , this seems to stem back to the board not picking the correct amount of ram installed
Has anybody else see this ?
Is there a resolve ?
Thanks in advance
Tadkin

Quote
is there something i am missing here to enable this board to see 4 gig of mem as per the specs of the board
I am only running XP and fully understand the SW limitation ,
I do not see this as being issue with SW , this seems to stem back to the board not picking the correct amount of ram installed
The software limitation you are talking about is only one side of the coin. The memory adress decode space of the chipsets memory controller is restricted to 32bit addressing before software (operating system) ever comes into play. Part of this adress space needs to be reserved for other system devices and cannot be used for system memory addressing. No mainboard featuring an Intel 865PE Chipset was ever (or will ever) be able to fully address 4GB of system memory. This is a chipset rather than a board or BIOS limitation. It is not even a problem but a hardware restriction that was only overcome severl chipset generations later (Intel P965 and 975X to be precise).

865PE Neo2-FIS2R, memory question!

Hi!
I´m thinking of buying memory for the 865PE Neo2-FIS2R mother board and have a few doubts that are on my mind.
1. If I want to use DualMode memory, should I use 256+256 or 512+512.
Lets assume that I buy 2x 256MB and uses them as DualMode.
Can I later put another 2 x 256MB into the computer and use them all as DualMode, (256+256+256+256) or is only possible to use 2 of each size.
Maybee I should buy 1x of 512MB and use it as SingeMode and later complement with another 512 and use them as DualMode.
hmmmmm.......any point of views?
The memory I´m talking about is:
Corsair CMX256A-3500C2 256Mb DDR PC3500 CAS2 434MHz
Corsair CMX512-3500C2 512Mb DDR PC3500 CAS2 434MHz
I assume that they are the same as MSI has in its
"DDR400 Memory Modules Qualified Vender List " and should work just fine with the motherboard.
Regards
WiGGoW

I would not go with that brand of ram. There are alot of issues being talked about involving that ram in this forum. I recommend Kingston and so does MSI. Keep in mind to obtain Ultr-Turbo in Bios you need to buy a latency of 2 or you will get an error message and your bios will reset to slow.

Upgrading memory question - unbalanced / mixing memory

2006 Mac Pro. Here is what I have. 4-2 gig dimms and 2-512 dimms totalling 9 gigs of memory. What should be the order that I install the 512 dimms. Riser A: 2-2 gig dimms and the 2-512 dimms, then Riser B: 2-2 gig dimms or should all four 2 gig dimms be in Riser A and the 2-512's in Riser B? Or should I not install the 512's at all? Does it matter mixing memory sizes? Thanks for any help.
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Leave them out.
Use 2 x 2GB in slots 1 and 2 only on each Riser.
4 DIMMs gives best, and adding 1GB isn't worth the added latency, heat, or performance.
Symmetrical memory performance comes with quad sets / channels.
You could put them in slots 3/4, but don't.

915P Neo2 Platinum - Memory?

Have devoured the MSI website & various others & I'm still not sure if DDR2 667 - PC2 5300 or DDR2 667 PC2 5400 is safe to use in the 915P Neo2 Platinum. One very tiny phrase, in one place, on MSI's website IMPLIES that it is OK, ". . . Support Dual Channel DDR2 533/400 MHz and up", BOLD emphasis mine. "and up"? I just can't interpret this.
At the price of these DDR2 DIMMS, this is no place to make a mistake, but the DDR2 667 PC2 5400 modules seem to be more plentiful, & even more competitively priced, than the DDR2 533/400 modules.
This is my third MSI build, & some of the posts here make me think I've made a mistake this time.
I would appreciate any advice/observations/experiences.

Some early, tentative answers to my memory question(s) are beginning to trickle in. As many of you undoubtedly know, DDR2-675 is a still-developing area, leading edge stuff. I did not heretofore know this . . . maybe I should have.
I am not a lazy PC enthusiast. Maybe I missed some of the available resources in my earlier searches & too soon resorted to pleading my case in this Forum (a dandy, if anyone cares what I think), & by writing Corsair. The "RAM Guy" at Corsair emailed me back with a nice, informative answer, & in the meantime I had just located some apparent answers on my own. Maybe these resources had been updated since I first looked, maybe I missed them, whatever, here are a few links that shed blinding light on the entire subject of DDR2-675 and some "wicked" latencies:
http://compatible.corsairmemory.com/memorysearch.aspx?modelid=550
http://www.corsairmicro.com/corsair/memory_guides.html
http://www.corsairmicro.com/corsair/currents/CurrentsOCT04.html (awesome, even newer DDR2 "wicked" latencies!)
http://www.corsairmicro.com/corsair/products/guides/buyers_guide.pdf
I am a 59-year old retiree geek-guy, with enough time to buy PC component parts & then build PCs and PC systems (this one for a grandson), & to research my choices. But, it's still difficult to track down the information novice builders like me need to make informed choices. The build process is infinitely rewarding, challenging, and, yes, at times very frustrating. I know . . . not exactly a news flash to any of you reading this.
Sorry if I previously whined in this fine Forum, & on this especially useful Board, "Intel P4 & Celeron P4 based board".

Mixing Memory Mac Pro 2.66 Xenon

Hello all!
Alright I am trying to figure the best configuration that I can afford for a memory upgrade to my Mac Pro. I am looking to spend somewhere south of $200.
I currently have the following memory configuration (3GB):
DIMM Riser A/DIMM 1: 1 GB
DIMM Riser A/DIMM 2: 1 GB
DIMM Riser B/DIMM 1: 512 MB
DIMM Riser B/DIMM 2: 512 MB
I wanted to expand it quite a bit more and see on NewEgg that they are charging appx 65.00 for (2 x 1GB) and 80.00 for (2 x 2GB). It's definitely a better price per GB to get the 2 x 2GB but would I see a large performance increase?
I have been reading on the message boards that it is best not to mix memory but it is suggested to fill all the slots with the same size memory.
I guess it just kills me to take out all of my existing memory to put in just the 4GB of new memory.
Could anyone provide any suggestions?
Thank you for your time in advance!

You have 3GB, which is on the lite side.
The ideal for that model is 4 DIMMs.
Without knowing if you are a light photoshop, or what you use it for, Apple calls 4 x 1GB for FCP (and audio apps) "symmetrical memory."
And I would look at 4 x 2GB and pull your 3GB, maybe sell it once you know the new memory is fine after a month.
Are you seeing page outs? multiple swap files?
Go to folder: /var/
Maybe you are better off with faster drives, new boot drive or for scratch. A WD 10K 150GB VelociRaptor for $180 even.

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

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 Speeds

Apologies, wrong thread, please ignore.
Message was edited by: Rhys Bethell

Hi Rhys,
i think what you are talking about is mixing memory size, not speed. You can not mix memory speeds, especially in Macs.
You can mix memory size in most Macs. Very few Macs use memory interleaving that requires exactly the same size memory modules to work best. The iMacs allow mixing size with no impact on performance.
Go ahead, Crucial is very good with Macs and can be trusted.
Also very good is Other World Computing (OWC).
Ralph

Memory question on Arch x86_64. 2x2048 MB = 3950 MB?

I have a naive memory question for some knowledgeable folks. My machine has 2x2 Gb sticks which should total to 4096. When I do a free -m under Arch, it's only showing 3950. Is the remaining 146 reserved or..?
$ free -m
total used free shared buffers cached
Mem: 3950 422 3528 0 28 157
-/+ buffers/cache: 236 3714
Swap: 2000 0 2000

Thats a really good question and the result you get is normal as far as I know.
Part of it (a small part I believe) is used by the kernel, the rest of it, and this is where things are not so clear, is reserved as an agp apperture.
As far as I could tell (I have stumbled uppon that too) the problem seems to be that some bioses don't setup everything as they should.
The thing is that some devices can only handle 32bit addresses so their address is somewhere until the 4GB mark, because the bios doesn't setup the memory remapping correctly (sometimes the user has no way set anything related to memory remapping, this seems to be the case with some desktop boards and most notebooks/laptops). This memory remapping "problem" was anticipated and there are ways to properly handle that.
For some reason unknown to me (and most people that have stumbled upon this) many bioses don't setup (or allow the setup) of proper remapping. To add to the problem the kernel seems to reserve 128MB of agp aperture by default even if you don't have an agp card, this reserved address space falls in the first 4GB of addressing space therefore stealing you some memory.
I have tried to regain those MB, I have tried to recompile the kernel with a different config and I've tried several kernel boot parameters and the only thing I could regain was 64MB if I recall correctly. I can't find now what I have added to regain those 64MB, I didn't keep that option in the kernel line, 64MB were not worth the possibility of having problems later on.
I know its a pain to have that voice in the back of your head telling you that there is some memory that is being wasted, specially if you have tried a 32bit kernel with support for 64GB of address space and got 4050 MB of usable memory, but just leave it as it is, it's not worth the time and the trouble.

Memory Question "4x1 Gig or 2x2 Gig?" what is faster?

Memory Question "*4x1 Gig or 2x2 Gig*?" what is faster?
I'm still don't know if witch to choose?
4 times 1 gigabyte Ram Memory is cheaper but if I choose for 2 times 2 GB Ram I can always beef it it later.
And is my memory faster if I'm using 4 slots with 1 gig over 2 slot with 2 gig?
I'm asking this question because I think using 4 times the memory bandwidth will be faster?
http://www.janmaartendewit.com

Hello Jan
Welcome to Apple Discussions
The iMac (Late 2009): Installing or replacing memory article and your User's Guide are pretty clear, they both say that +"You can use 2 GB or 4 GB RAM SO-DIMMs of 1066MHz DDR3 SDRAM in each slot."+ and not 1GB modules. > http://support.apple.com/kb/HT3918
To upgrade your ram you will want at least 2 more 2 or 4GB modules and add that to the current 2 x 2GB of ram. > http://eshop.macsales.com/shop/memory/iMac/DDR321.527
Dennis

K7T266 Pro2 mixing memory ?!?

Hi all,
I am having a problem with mixing memory. The tech. at the computer shop say that a PC2100 and a PC2700 should work whitout problem, so I by one 512MB PC2700 !!!
Here, on my mobo, the memory check pass at boot, but WindowsXP crash when it access the PC2700 memory...
In bios, I set CAS lentacy at 2.5 and force the memory clock to 133MHz...
Note that the PC2700 work fine, alone...
You have idea ? Is PC2100 and PC2700 can be mixted ?
thanks,

Also, I can tell you that this mobo, K7T266 Pro2, is very picky about memory sticks.
Especially when mixing brands.

RD530 Mixing Memory

I have a ThinkServer RD530 and am wanting to upgrade the RAM. I currently have two 8GB RDIMMS that I would like to continue using while adding two 16 GB RDIMMS. I have reviewed the memory rules from the HMM but have been unable to confirm either way whether this is supported. Will mixing RAM sizes (while staying constant with frequency and voltage) cause any problems? Is there a certain way I need to configure the RAM if different sizes will work?
Solved!
Go to Solution.

Hello mmunsterman,
While this response is delayed, you are able to mix memory sizes. There is no special configuration needed, just follow the instructions for installing the memory into the correct numbered slot. You can boot into BIOS and verify that your additional memory is seen.

K8N Neo2 memory question

Im building my new system
AMD 64 3800+
MSI K8N NEO2 Mbo
1 gig dual channel Corsair 400
Ati X800XL
Audigy 2 ZS
The memory I bought is dual channel PC 3200 for 400 speed.
Now in the BIOS I only have option up to 200 frequency speed .
The available options are 100, 133, 166, and 200
Is this correct?
Now there is another option called High Performance mode.
here I can adjust the memory up to 400.
I havent touch this because I dont know if its here where I can increase the speed or not, I rather ask first.
Thanks a lot

The first option you mentioned is to set the frequency for the CPU. The second is to set the frequency for the memory. So if your CPU is a 200MHz set that at the first option then x 2 for the memory option.
Good Luck
Jeremy

Neo2 Mixing Memory Question

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