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A Little help with timings

post #1 of 6
Thread Starter 
So I bought a 24Gb kit of G.Skill rated to run at 1600 with 999-24, with my multipliers and everything, I can run 1363 or 1702 without changing my overclock. Right now I have them on 1363 at 777-20 with apparent room to go tighter.

What is the consensus? Should I favor tighter timings or more speed for gulftown?

Also, now that I have it down to 777-20, how should I go about working it tighter? Which timings are easier to drop?

Any links you can point me to would be helpful, most RAM oc info I found was written in the time of DDR2.

EDIT: This kit runs at 1.5V, so I could conceivably run it up to 1.65v to achieve better speed and timing.
Edited by esp42089 - 8/3/11 at 11:24am
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post #2 of 6
Wich one is better, speed or timings, depends more on software. There are apps that favour speed and apps that favour tighter timings, so a good combination between both is ideal.
IMO, you should aim for 1702 CL8 if possible, or lower if you can, but i doubt it a little.
The harder timing to tune is "the middle one" RAS to CAS iirc, so for a speed of 1702MHz you should be able to reach 8-9-8-24-2T at least.
Higher speeds will require a better finetune of QPI link though if i'm not mistaken...

The DDR2 guides you might found around here will serve you for DDR3

Edit: You can bench both options with Maxxmem
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post #3 of 6
Should I tighten my timings? I have a CAS of 11
    
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post #4 of 6
Thread Starter 
Is it worth it to try and switch the command rate from 2T down to 1N or whatever it is? I know it is supposed to be difficult, but will it give significantly enhanced performance? Also, how important is it to work the tRAS down from 24?

EDIT: I thought it may help people to know that I am using my workstation for molecular dynamics, and frequently run jobs that take all 24Gb and load the processor to 100% for upwards of 5 days. Any enhancement in the memory department will yield tremendous time savings.

Upon a little further research, it seems that I may have great difficulty getting 6-4Gb DIMMs to run on 1T, but that it will greatly enhance memory bandwidth. I guess I need to just experiment a little.
Edited by esp42089 - 8/3/11 at 12:32pm
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post #5 of 6
Yeah, command rate from 2T to 1T improves bandwith, although it is hard to reach sometimes

You can have more in fo on the timings here.

I'm not sure of this, but maybe your work will benefit from higher speed memory instead of tighter timings.

@jeffdamann:
If your ram kits are rated at 2133MHz 11-11-11-30 at 1.5V maybe you can run them at 1968MHz 9-10-9-24-2T with 1.65V. just a guess though, you need to try it out and don't go crazy on the voltage
Increase CPU-NB speed to take maximum advantage of your high speed RAM if you haven't.
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post #6 of 6
Thread Starter 
So, after some experimenting, MaxxMem says that 1363MHz at 7-7-7-19-2T is the best I can do at 1.60v. I also got 1704MHz down to 9-9-8-24-2T which was slower in everyway. I also did 1363 at 8-9-8-24-1T which was about the same as 1704. Should I play with the auto settings in BIOS to see if I can get it better?
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