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Maximizing PPD for Chimp Challenge

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Old 05-11-12, 07:02 PM Thread Starter   #1
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Maximizing PPD for Chimp Challenge


Hey guys,

I'm sure I'm not alone trying to find ways to maximize my output for the race. Figured I'd start a thread to ask my questions, and hopefully help anyone else who might be unsure of what/how to run.

I'm setting up 3 new rigs that I'm piecing together right now for the race. All 3 will be naked dedicated rigs: 1x Q9550, 2x Q6600.

As we all know, Linux is where it's at for PPD. I'll be overclocking all weekend, and once stable installing Ubuntu 10.10 on them all. My question is, what client will give best PPD/WUs? v6 or v7?

Feel free to post your own questions in this thread, maybe this can turn into a good resource for all of us.

Fold on!

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Old 05-11-12, 07:15 PM   #2
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6.34 console client is the best. The V7 linux client is still being "polished" - it has received less attention, than the Windows client, so it's a bit behind.

On the plus side, it has the "download the next wu at 9X%" feature built into it, so that's a good start. (Where X is any digit you select).
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Old 05-11-12, 07:20 PM   #3
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From what I've gathered so far, go with v6.34 under Linux for max ppd.
Also, ram-wise go for high mhz, tight timings don't help as much.
CPU only smp is the way to go too.
My two cents...

Edit: Lol at my slow typing speed...

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Old 05-11-12, 07:33 PM Thread Starter   #4
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Well then, sound like I'll be going with 6.34.

Next question. I've found my max on a Q6600 today. 3.71GHz Prime stable 24 hours. Running 411 x 9 1.58 vcore. Ram is 1066MHz. Can I save time by just using a divider to bump the ram's speed up, or should I find my max FSB? Will there be a TPF difference compared to, say, 463 x 8? In my 775 days I always ran 1:1, so I don't have much experience with dividers.

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Old 05-11-12, 07:35 PM   #5
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And, enter Adak and his knowledge to shed some light on that.
I think there's always a bandwidth hit when going with dividers, and you should normally go for higher ram speed than fsb -with modern ddr3 at least- but with ddr2 and prior stuff, moar fsb 1:1 was the way to go.

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Old 05-11-12, 07:42 PM Thread Starter   #6
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That's what I'm thinking too, Ivan. Guess I'll have to test for Max FSB too.

Running out of time....

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Old 05-11-12, 07:51 PM   #7
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Tell me about that!
I have my board and nh-c14 at customs still...Wanna race so bad!

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Old 05-11-12, 08:34 PM   #8
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Fever, if you take your rig's overclock right to the max, it will fail when it's time to race. Prime95 is good, but it's not as stressful as folding.

My suggestion is to forget the dividers, and get your max stable overclock - then back it down one notch. In a 10 day race, you won't have time to recover from a 2% faster rig, that fails every third or fifth wu, losing thousands of points.

It's the old "Titanic" lesson. The "icebergs" of crashed wu's are "in the water". If you want to get to New York in a hurry, slow down a bit.
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Old 05-11-12, 10:04 PM   #9
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GHZ is the final key, not FSB speed.

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Old 05-11-12, 11:30 PM Thread Starter   #10
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Quote:
Originally Posted by ivanlabrie View Post
Tell me about that!
I have my board and nh-c14 at customs still...Wanna race so bad!
Hope you get it soon! Not only for the race, I know you've been planning your rig for quite a while now. Must be a real **** off knowing that the last pieces of the puzzle are so close!

Quote:
Originally Posted by Adak View Post
Fever, if you take your rig's overclock right to the max, it will fail when it's time to race. Prime95 is good, but it's not as stressful as folding.

My suggestion is to forget the dividers, and get your max stable overclock - then back it down one notch. In a 10 day race, you won't have time to recover from a 2% faster rig, that fails every third or fifth wu, losing thousands of points.

It's the old "Titanic" lesson. The "icebergs" of crashed wu's are "in the water". If you want to get to New York in a hurry, slow down a bit.
They never go to the max per se, as max wouldn't be stable as you say. Thanks for the tip about dividers, I figured they weren't worth the time to re-test. Don't worry about the rigs failing, though. When I'm finished testing a rig they don't crash, period. Folding never begins before I'm 100% certain of a CPU's calculating ability as I don't want to mess the science up in the slightest. I'll avoid getting into details, but stable to me only comes after 48h+ of testing with various methods.

Quote:
Originally Posted by WarriorII View Post
GHZ is the final key, not FSB speed.
I'm just not sure about 775 and DDR2. I know that with my 2600Ks RAM speed plays a pretty big role. For example, my 2600K @ 4.7GHz 2133DDR3 get slightly better TPF than my 2600K @ 4.9GHz 1600DDR3. The faster RAM is able to make up for 200MHz worth of clock speed, and then some. Just wondering if the same principal would apply to the 775 platform, or if sticking 1:1 will result in better TPF.

Right now I've started testing the Q6700 at 4:5, which brings me just shy the RAM's rated speed of 1066.

Time to start overclocking the Q9550 Rex combo while the other rig is stress testing. Should be interesting, as this will be the first time I use DDR3 on this old platform. It's definitely getting hot in here!!

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Last edited by Fever; 05-11-12 at 11:36 PM.
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Old 05-11-12, 11:57 PM Thread Starter   #11
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Also, concerning stability, I'd suggest everyone use Stanford's official F@H stress testing program before the race to make sure everything hums along nicely during the race.

http://folding.stanford.edu/English/DownloadUtils

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Old 05-12-12, 02:24 AM Thread Starter   #12
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What flags should I set for best PPD in 6.34?

-advmethods
-beta
neither??

small, normal, or big packet size?

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Old 05-12-12, 04:22 AM   #13
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Always big packet size. I don't use the advmethods or beta flags because when a work unit errors out for any reason, I would usually miss several hours of folding, before I could fix the problem.

Which is better right now? That's a question best answered by ChasR or Macaholic, who are mods for Stanford's folding forum, and more up on the latest news than the rest of us.
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Old 05-12-12, 08:24 AM   #14
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On the C2Qs, folding with the videocards, if you have them, is the way to maxppd. A GTX260 will make about 8000 ppd while only knocking about 1500 ppd off the smp instance. My recommendation on a 2600K would be different. It's a real PITA if you're going to be running native Linux to get the video cards going. If you have enough Windows licenses, Installing Linux in a VM and running the Video cards in Windows is the best option. By overclocking the video cards in windows (can't be easily done in Linux) you can more than make up for the loss of ppd from the VM overhead,

THe C2Qs aren't going to perform much differently regardless of dividers. My Q6600s @ 3.2 make virtually the same ppd @ 400 x 8 as 356 x 9. I don't run any of the Q6600s past 3.4 because of the voltage required to reach that. I don't think a vcore of 1.58 is sustainable, but you could prove me wrong.

I've tested ram extensively on C2Qs and found the difference between 800 4-4-4-12 and 1067 5-5-5-15 to be less than 2%, the later being faster.

I'm not currently folding enough instances to know what the "best" flags are.

OCCT is currently the best FAH stability tester.

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