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RAM channel query


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#1 smurfgod

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Posted 30 January 2009 - 01:02 PM

Sup guys, been a while. And like all questions i've ever asked here i should know the answer already but well its my money i'm gonna spend so i wanna make sure :thumbsup: Basically here's the gist, I"m building 2 computers using http://www.newegg.com/Product/Product.aspx...N82E16813131330 and 32 bit xp. I wanna be able to use 3G of RAM, since it only maxes at 3.something anyway.
Question is can I spit 2 sets with same timings/latency like take a stick of http://www.newegg.com/Product/Product.aspx...N82E16820227289 and a stick of http://www.newegg.com/Product/Product.aspx...N82E16820227178 slap one into channel A and one into B and it work?

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#2 dpunisher

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Posted 30 January 2009 - 04:19 PM

No. The sticks have to be the same size; although. some motherboards can run 3 sticks in dual channel (ie a 2gig stick on one channel and a pair of 1gig sticks on the other channel). It helps to have RAM with the same timings. The RAM you listed has different timings. Any time you use unmatched RAM in dual channel, you takes your chances.

Burn the extra $12 and get 2 sets of the 2X2gig sticks.

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#3 rigacci

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Posted 31 January 2009 - 08:37 AM

In the long run, using a set of 2GB sticks is probably the easiest method. It may also be the cheapest.

Another way would be to install a matched set of 1GB sticks and another matched set of 512MB sticks but like I said before, it would be easiest to get 2 matched pairs for each board.

However, here is a method for using all 4GB of RAM. Check this out:

http://blogs.msdn.com/oldnewthing/archive/.../05/208908.aspx

Good luck.

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#4 Platypus

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Posted 31 January 2009 - 09:40 AM

However, here is a method for using all 4GB of RAM. Check this out:

http://blogs.msdn.com/oldnewthing/archive/.../05/208908.aspx

Unfortunately the link only leads to a discussion of the /3GB switch, which makes no difference to the proportion of 4GB of physical RAM that can be used. The /3GB switch just takes 1GB of virtual addresses away from the Windows kernel address space and makes it available in the user address space to the few applications that are large address aware.

PAE is the function that potentially (but problematically) allows Windows to use the otherwise mostly inaccessible uppermost 1GB of physical memory if it's moved above the 4GB point.

http://www.microsoft.com/whdc/system/platf...PAE/PAEmem.mspx

Edited by Platypus, 31 January 2009 - 09:41 AM.

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#5 rigacci

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Posted 31 January 2009 - 09:51 AM

Thanks for the link. Very good white paper. Sorry for any misinformation as I have never used the /3GB switch myself and would definitely advise anyone interested to investigate further.

I would say though that a 4GB matched pair (of 2GB sticks) is probably the cheapest way to go.

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#6 Platypus

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Posted 31 January 2009 - 09:56 AM

I would say though that a 4GB matched pair (of 2GB sticks) is probably the cheapest way to go.

Especially since it allows an easy path for possible future upgrade to 64bit OS.

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#7 the_patriot11

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Posted 06 February 2009 - 03:15 AM

technically in theory, with some motherboards you can, ive run boards with mixed sticks like that and ive seen others run like that, however not all motherboards support that, and on top of that you wont get maximum performance, especially if the timings arnt the same. Id just buy a 2 x 2 gig setup, sure 32 bit windows wont recognize like .75 if one gig, but the 3.25 or whatever the actual figure is will run better. or, u could invest in a 64 bit system. or for that matter 2 gigs is more then enough for XP, if u really want to save money just buy a 2 gig set.

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