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Lower benchmarks after adding more RAM


heathuff

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Hi all, I hope someone can help. OK, stay with me here...Previously I had 1GB of Corsair RAM (One stick was Corsair XMS CMX512-3200C2 and one was just Corsair XMS CMX512-3200) which I had running in dual channel but the speed POST was showing was 333mhz.

I thought the speed should have been 400mhz, so to rectify the problem I installed another stick of CMX512-3200C2 and removed the CMX512-3200. (So now I had matching pairs running in dual channel) and now at POST it shows 400mhz which is fine.

I used a program called Everest to benchmark and I got the results seen in the attached image 'mem1024.png'. Then I decided to add the other 512 chip (CMX512-3200) and now I'm running in single channel mode and I got horrible benchmarks as seen in image 'mem1536.png'. Is this because I am running in single channel mode with all 3 sticks installed? I have my timings all set at the BIOS defaults using an ASUS A8n32-SLI Deluxe motherboard...sorry this is so long-any help would be appreciated...thanks!

mem1024.png.925f3ef7469417a6ae747823aa07a5fa.png

mem1536.png.0393fe9734d6a861c75ddd8d3cee063b.png

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Yes, 3 sticks are slower than 2, as you're running in single vs dual channel mode, and the memory controller works harder w/ more sticks.

 

Also, you're running sticks of different ICs / timings together, which slows it down as well. That's why the 3200 + 3200C2 ran @ 333 Mhz.

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Thanks for the prompt response...so if I want to run 2 gigs in dual channel, will I have to ditch the CMX512-3200 chip altogether and get 2 of the CMX512-3200C2's? or could I just get one more of the 3200C2 and pair it with the 3200? I really dont want to pitch a perfectly good chip if I dont have to...thanks for the help!
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