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Dual Channel Combined, Perfomance Gain or Lost?

Last response: in Memory
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November 28, 2006 6:57:49 PM

Hi

Im building a system and its gonna have 1Gb of DDR800 Corsair memory. model TWIN2X1024C4 1GB PC6400. Well this is a dual channel kit and I would like to add maybe 1Gb more or 2Gb more in the future but I have a question, if I pick the model with 2Gb (TWIN2X2048C4) will it work in dual channel OK together with my TWIN2X1024C4? They are the samething is just that two sticks have more memory than the other two but same model, brand and latency. Will it work?
November 28, 2006 7:54:32 PM

Quote:
Hi

Im building a system and its gonna have 1Gb of DDR800 Corsair memory. model TWIN2X1024C4 1GB PC6400. Well this is a dual channel kit and I would like to add maybe 1Gb more or 2Gb more in the future but I have a question, if I pick the model with 2Gb (TWIN2X2048C4) will it work in dual channel OK together with my TWIN2X1024C4? They are the samething is just that two sticks have more memory than the other two but same model, brand and latency. Will it work?


it will work. you will lose performance a little bit as you stress on the memory controller.
November 28, 2006 8:32:44 PM

I dont understand that, isnt the system suppose to gain more perfomance while more RAM is added?
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November 28, 2006 9:21:51 PM

Some AMD CPUs don't like running with 4 DIMMS and require a 2T command rate. This can have a slight negative performance impact, but not enough to offset the 1gig-2gig advantage. (2gig-4gig maybe as thats a negligible advantage for gaming anyway)

975X and P965 Intel platforms run fine with 4 DIMMs at 1T, and I believe the 945 does too.
November 28, 2006 9:27:44 PM

Im gonna use it in a 680i, will that work ok and with that 1T?
November 28, 2006 10:16:08 PM

Yeah the 680i's do fine with a 1T command rate and 4 DIMMs.

Basically as long as you have the same total amount of RAM in each channel it will work fine in Dual Channel interleaved mode. You currently have 512MB per channel, and either 1GB or 1.5GB per channel (2GB or 3GB total) would work fine.

You will be limited to the clock rates and latencies of the lowest performing module, so there is no point buying 1000MHz 4-4-4-12 RAM if your current RAM is 800MHz 5-5-5-15, but if you get RAM with the same rated voltage, Latencies, and clock, you'll be fine :) 
November 28, 2006 11:10:19 PM

Ok Thanks! so that means I can buy 2gb later on :D 
!