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Old February 10, 2008, 10:28 AM
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Default timings vs. speed

I have the OCZ reapers, rated at 4-4-4-15, currently running at 850mhz.

If I drop the timings to 5-5-5-15 and try to run the memory faster, should I expect to see any significant gains in my F@H processing?
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Old February 10, 2008, 10:31 AM
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I found that 5-5-5-15 @ 1000mhz was faster than 4-4-4-12 @800mhz.

Just barely, but it proves that a 20% speed increase beats a 20% latency drop.
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Old February 10, 2008, 11:21 AM
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Quote:
Originally Posted by Squeetard View Post
Just barely, but it proves that a 20% speed increase beats a 20% latency drop.
This is a given, since latencies are measured in clock cycles and are relative to the frequency of the ram. So if you increase timings by 20%, then increase the frequency by 20%, the actual latency will be essential unchanged, while bandwidth will have increased.

So PC3200 with 2-2-2, PC6400 with 4-4-4 and PC12800 with 8-8-8 timings all have similar latencies, before taking chipsets, etc. into account.
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Old February 10, 2008, 12:31 PM
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You should be able to push those reapers to 4-4-4-12 or something similiar at 1066- maybe 4-5-4-12 etc... even the very cheap SLI OCZ kit does 4-5-5-10 at 1100 DDR 2 with less than 2.2 v . Tight timings with high bandwidth is even better than just high bandwidth alone.
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Old February 10, 2008, 03:24 PM
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I crashed my bios at 4-4-4-12 1000, and it reset (when I was first overclocking).

I never thought I could reach speeds that high...I will give it a shot and see where it takes me.

In this instance, is it better to have a higher fsb and a lower memory multiplier, or does it only make synthetic differences as with CPUs ? (by memory multiplier, I mean that in my BIOS I can set the speed to 2.0, 2.4, 2.5, 3, 3.33, and 4x FSB speed etc, and then there are strapping options - whatever that means).
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Old February 10, 2008, 04:25 PM
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Those reapers will take a lot of volts, where do have them set at now? As to memory multiplier where are you now? 2x?
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Old February 10, 2008, 04:41 PM
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+0.3v in my ds3r f7 bios. I think stock is 1.8v so that would mean running at 2.1v currently.

I am at 350mhz FSB and have memory running at 2.4x, for a speed of 840mhz (5:6 ratio FSB:RAM if that helps). Timings are 4-4-4-15, 2T. I thought if I had 2 channels running that I could run in 1T?

Man I am so out of these essential bits of knowledge these days.
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Old February 10, 2008, 04:54 PM
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I'm running my crucial ballistiX at 1128mhz, 4-4-4-12 with 2.3 volts. Stable for 6 months now.
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Old February 10, 2008, 06:47 PM
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My System Specs

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In the tests I've done 5-5-5-15 @ 1000 is better than 4-4-4-12 @ 800

squeetard - that's lots of juice- what kind of motherboard are you running?
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Old February 10, 2008, 07:32 PM
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I agree, I'm just saying 4-x-x-x @10xx is better still. But to answer the question originally as put, folding on an Intel won't see a huge improvement with tighter timings. The large cache vs AM2 helps ensure that it gets enough data fast enough. You can improve folding times drastically on dual cores with the affinity manager utility for dual cores.

I just engaged in this conversation initially because I figured that RAM would do at least 1000 at 4 series timings, but every stick it different and most people aren't into playing with the drive strengths etc...
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