Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Forum Jump  
Mixing DDR3 DIMMS - MIR related
Last post Fri, Feb 05 2010 by Luigiiii, 8 replies.
Options
Go to last post
Posted on Sun, Dec 20 2009 18:18
by Simsy
Joined on Mon, May 21 2007, Posts 385

Hi

I have a PC machine that I use for MIR - i7 975 3.33 Ghz, 12 GB RAM (6x2GB). I need more memory, the CPU level is always pretty low but I have used all 12 GB RAM. 

I found this http://www.crucial.com/uk/store/partspecs.aspx?IMODULE=CT51264BA1339&click=true but I cannot afford to purchase 6 of them. Can I purchase say 2 of them now and then another 2 and finally 2 more to take me up to 24 GB? Can you mix and match different sized DIMMs?

Posted on Sat, Dec 26 2009 12:51
by cm
Joined on Fri, Dec 20 2002, vienna, Posts 9137

basically you can, but you need always to have triples of the same size - and both triples should have the same latency values to avoid idle cycles on the memory bus.

christian

and remember: a CRAY is the only computer that runs an endless loop in just four hours ...
Posted on Sat, Dec 26 2009 13:17
by Simsy
Joined on Mon, May 21 2007, Posts 385

OK,

So I would need to purchase 3 of them?

Posted on Thu, Feb 04 2010 23:05
by Simsy
Joined on Mon, May 21 2007, Posts 385

Hi Christian,

Sorry to resurrect this old thread, but I am finally getting round to ordering the memory. But I know very little about this kind of thing so just want to make sure that I am ordering the correct thing.

First, here is exactly my MIR machine

Intel Core i7 975 3.33Ghz Extreme Edition

Asus Rampage II Extreme Intel X58 (Socket 1366) DDR3 Motherboard

G. Skill Perfect Storm "Low Latency" 12GB (6x2GB) DDR3 PC3-16000C8 2000Mhz Triple Channel Kit

Ok, so I need more RAM, 12GB is just not enough. So what I want to know is

1) Is this the correct RAM to order : http://www.crucial.com/u...264BA1339&click=true

2) How many DIMMS do I need to change, is it 2, then I can another 2 and finally another 2 OR do you have to change 3 at a time?

I would really appreciate you help on this!! Sorry to be bothering you.

Thanks!

Posted on Fri, Feb 05 2010 05:48
by cm
Joined on Fri, Dec 20 2002, vienna, Posts 9137

with triple channel memory controllers you always need to have 3 modules of the same size (and of course have them sitting in the corresponding slots).

the memory type you have linked is basically fine for i7 motherboards, a few things to look at:

- make sure your old and new memory is using the same voltage

- make sure old and new has the same CAS latency (eg. starting with CL9)

- for best performance and stability all latency values should be the same (eg. 9-9-9-24)

 

in an ideal world you have 6 modules from the same production series and they are explicitely mentioned in the memory compatibility list for your motherboard.

christian

and remember: a CRAY is the only computer that runs an endless loop in just four hours ...
Posted on Fri, Feb 05 2010 08:41
by Luigiiii
Joined on Thu, Dec 03 2009, Posts 45
hi christian,

i am plannung to build new pc for mir
which one is better: 9-9-9-x or 10-10-10-x? higher numbres are good or worse? :)

thx
kambiz
Posted on Fri, Feb 05 2010 10:50
by cm
Joined on Fri, Dec 20 2002, vienna, Posts 9137

lower is better - as always with latency ;-)

and remember: a CRAY is the only computer that runs an endless loop in just four hours ...
Posted on Fri, Feb 05 2010 15:55
by Luigiiii
Joined on Thu, Dec 03 2009, Posts 45
sounds obvious :)
i didn't know these numbres were about latency
You cannot post new threads in this forum.
You cannot reply to threads in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.