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Folding and Memory - Page 2

post #11 of 18
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Quote:
Originally Posted by LiLChris View Post
It does make a difference, but it isn't ground breaking.
Why not ask him for his ram speed/timings and try it yourself and see if you get 2k more?
Lol, Its not Im doing this behind his back to get more points. I just wanted to see if there any science/facts behind this.
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post #12 of 18
I never assumed you were doing it behind his back, considering you made a thread.
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post #13 of 18
Quote:
Originally Posted by sks72 View Post
Here's some interesting data on how ram affects PPD.

i7 920 4.2Ghz 6Gb DDR3-1600 9-9-9-24
i7 2600k 4.0Ghz 4Gb DDR3-1333 9-9-9-24

Standard SMP (P605x):
i7 920 19,500 PPD
i7 2600k 19,800 PPD

BigAdv (P6900):
i7 920 37,400 PPD
i7 2600k 33,700 PPD
Notice that Bigadv favors the faster/tripple channel RAM.
Edited by sks72 - 2/10/11 at 1:49pm
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post #14 of 18
yeah, speed seems to have the most effect

although its weird you're doing a memory test using two different chips... not sure what that proves exactly, lol
post #15 of 18
RAM only really comes into play for -bigadv; SMP will see improvements, but in general, they will be pretty minimal.

I think speed gives a bit more of a PPD boost, but really, improving either will help out.
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post #16 of 18
I don't know how it works in DDR3, but DDR2 timings have a bigger impact than most people think. Going from 800 4-4-4 ram to 1066 5-5-5 ram showed a smaller increase in folding with the SMP client than one might expect. Going from 5-5-5 to 4-4-4 at the same ram speed will gain about 60% as much as going from 800 to 1066 with the same timings. Essentially lowering timings one step (5-5-5 to 4-4-4) is worth about 1/2 step of ram speed (800 to about 940).

Timings had an even greater impact on the old 939 AMD Dual Core systems running SMP back when that was a viable option.
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post #17 of 18
PappSmurf is correct timings and DDR2 vs DDR3 have a much greater affect than speed the first 2 are Identical set up's the only difference is DDR2 1587Mhz 4Gb 7-7-7-21-72-1T vs DDR3 1587Mhz 6GB 7-7-7-21-72-1T both running 4.15Ghz as you can see there is a 1min. difference in frame times.

Project ID: 6900
Core: GRO-A3
Credit: 8955
Frames: 100


Name: i7 920 4.150Ghz
Path: \\\\Rick-pc4\\fah\\
Number of Frames Observed: 300

Min. Time / Frame : 00:30:47 - 36,059.0 PPD
Avg. Time / Frame : 00:31:12 - 35,339.1 PPD


Name: i7 920 4.15Ghz
Path: \\\\Barbie-pc\\fah\\
Number of Frames Observed: 300

Min. Time / Frame : 00:29:03 - 39,334.0 PPD
Avg. Time / Frame : 00:30:13 - 37,078.1 PPD

These 2 are 2 identical 980X machines running at Identical settings also except for ram timings 1 is running DDR3 1784Mhz 7-7-7-24-72-1T the other is DDR3 1784Mhz 8-7-7-24-72-1T so just a very slight difference in timings makes a 13sec difference in frame time which is a 1100 PPD difference. Both of these have DDR3 2000 ram in them but the best I can get it to run at 2000Mhz is 9-9-9-24-2T and I loose about 30sec per frame at that speed compared to running the memory at 1784 7-7-7-24-72-1T

Name: i7 980X 4.44Ghz
Path: \\\\Rick3\\fah\\
Number of Frames Observed: 300

Min. Time / Frame : 00:19:42 - 70,434.8 PPD
Avg. Time / Frame : 00:19:57 - 69,115.0 PPD


Name: i7 980X 4.440Ghz
Path: \\\\Rick-pc\\fah\\
Number of Frames Observed: 300

Min. Time / Frame : 00:18:58 - 74,559.1 PPD
Avg. Time / Frame : 00:20:10 - 68,004.2 PPD
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post #18 of 18
^ hmm that's quite different than what i've found w/ a 2600k.. i m not sure how going from CL8 to CL7 could give you a 4k ppd boost .... anyway, heres my quick test

2600k 4.8ghz on a P6900, using ripjaws X 2133mhz:

1600mhz 7-8-7
max ppd = 49.8k

1600mhz 8-8-8
max ppd = 49.6k

1600mhz 9-9-9
max ppd = 49.2k

2133mhz 9-11-9
max ppd = 51.8k

so looks like timings dont matter as much, but speed gives a nice boost though
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