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Old 08-03-2008, 11:54 PM   #1 (permalink)
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Default FSB:DRAM ratio Help

Ok. I tried doing a search and something must not be right because I got 0 hits with anything to do with the topic. I'm trying to find out if I'm better off leaving my computer as is, or underclocking my RAM. Right now I have a Q9450 OC'd at 3.2GHz (400MHz x 8) and Corsair Dominator DDR2 PC8500 (1066MHz) memory at 1066MHz (400MHz MCH and 2.66 multiplier) and CL5 timing. Am I better off leaving it like this, with a FSBRAM ration of 3:4, or underclocking my memory to 800MHz to get a 1:1 ratio and perhaps tightening my timing to CL4? I've tried to look this up and get no answers that make me feel comfortable. I obviously am looking for the best compromise of performance and stability/reliability. Please help if you can explain.

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Old 08-04-2008, 08:24 AM   #2 (permalink)
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Default Re: FSB:DRAM ratio Help

1066vs800mhz you'll notice very little difference. If I was you, i would run it at a 1:1 ratio and tighten the timings a bit because i'm pretty sure tighter timings are better than mhz (unless you can keep tight timings and high mhz which you can't really in most cases)


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Old 08-04-2008, 10:54 AM   #3 (permalink)
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Default Re: FSB:DRAM ratio Help

Oddly.. I just bumped my ram from 1:1, so ram was@ 667mhz, to 800mhz and I lost 700 pts in 3dmark.

I also put in the newest nvidia drivers though, so.
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Old 08-04-2008, 07:25 PM   #4 (permalink)
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Default Re: FSB:DRAM ratio Help

What benchmark should I use? I just did memory benchmarks with Everest and got the following values:
@CL5 and 1066MHz
Memory Write = 7453 MB/s
Memory Read = 8499 MB/s
Memory Copy = 8413 MB/s
Memory Latency = 71.7ns

@CL4 and 800MHz
Memory Write = 6531 MB/s
Memory Read = 7453 MB/s
Memory Copy = 8158 MB/s
Memory Latency = 84.7ns

This makes it look like I should use the CL5 at 1066MHz. Is there another benchmark I should download and use to show system peformance and difference between 1:1 and 3:4 ratios?
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