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Maximize your SMP folding! 2 easy steps!

post #1 of 39
Thread Starter 
Ok over the past week I have done some tinkering and found 2 easy things we can all do to maximize our SMP folding rigs.

Step #1) Get VMware and Arch. Easy to install and use.

My findings 1xWINSMP vs. 2xLinux SMP; 3.6GHz (400x9) DDR800 4-4-4-12 2T
WINSMP--->~7:45/% x1 client
LinuxSMP-->~10:45/% x2 clientsNet ppd gain ~50%

Step #2) Back off the DDR MHz and tighten your timings. Sounds crazy I know, but you can get huge gains by running your RAM 800-850MHz at tighter timings than you can get at DDR 1000+MHz.

My findings with same CPU:FSB, varied RAM settings:
DDR1066 5-5-5-18 2T--->~13:00/% x2 Linux SMP clients
DDR800 4-4-4-12 2T---->~10:45/% x2 Linux SMP clients
DDR800 3-3-3-8 1T---->~5:10/% x2 Linux SMP clients. Net ppd gain 100%

Ravin's estimated production gains from tweaks; WINSMP--->Linux & tighter timings: 280% (7:45/% x1 vs. 5:10/%x2)

And don't ask if I , Just try it for yourself and see!

Edit: DDR800 3-3-3-8 2T---->10:10/% 1T started to get flaky on me.
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post #2 of 39
Good post. You may also see an decrease in times from 400 x 9 to 450 x 8.
post #3 of 39
Nice work! +reps
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post #4 of 39
Thread Starter 
Quote:
Originally Posted by wire View Post
Good post. You may also see an increase in times from 400 x 9 to 450 x 8.
Thanks. I've thought about running 450x8 instead of 400x9, but 400x9 was so easy to hit and stable, so I never tried to drop the multi and push for more FSB. I also doubt that I can run DDR-900 at CAS 3 without insane Vdimm, but again, never tried
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Q6600 SLACR L727A903 1.2875VID (450*8)@1.40V Maximus Rampage X38 Visiontek HD4870(512) 825/1100 4x1G Elpida E5108AJBG 8E 1128MHz 4-5-5-15 PL6 2.1V 
Hard DriveOptical DriveOSMonitor
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post #5 of 39
I might try this when I get home. Lower my MHz to near 800 and try out 3-3-3-8.

~Gooda~
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post #6 of 39
Quote:
Originally Posted by Ravin View Post

Edit: DDR800 3-3-3-8 2T---->10:10/% 1T started to get flaky on me.
one problem...not everyones ram will run 3-3-3-8 2T

5 mins per % x 2 is pretty extreme folding and probably double what most in the world are folding at.
post #7 of 39
I'm going to try similar settings. I have 4gb gskill rated at 5-5-5-15. Right now I have them running 4-4-4-12 with 2.3v into them. I'm gonna try 3-3-3-8/9 to see if there is a huge difference.
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post #8 of 39
I knocked mine down from 850mhz 5-5-5-12-2t to 800mhz 4-4-4-8-2t. We'll see if I get any kind of decrease in times. I tried 3-3-3-8-2t but pc wouldnt boot. I'll try anything to get faster times.
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post #9 of 39
Ya, even with 2.4v my chips won't run 3-3-3-8... but I have 4-3-4-9 right now. We shall see!
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post #10 of 39
Windows SMP for me is faster with higher RAM speed over tighter timings. For Linux, I haven't tried for it yet.

I am very interested in Linux folding, but I have a question.

Quote:
DDR800 3-3-3-8 1T---->~5:10/% x2 Linux SMP clients. Net ppd gain 100%
Are you running x2 SMP on a Vmware?
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