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Poem@Home Gpu support! - Page 34

post #331 of 396
Quote:
Originally Posted by Bal3Wolf View Post

lol yea i got my 5ghz and 4800 saved in bios i just droped it to 44 and left the volts at 1.38 lol way to much for 4400 but atleast it will be stable while i test and see if times change much.

That is what I was doing with my GPU yesterday - ended up running at 950MHz @ 1.3v... whistle.gif
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post #332 of 396
only slightly ridiculous. you could probably run 950 at stock 1.093v. Nice
     
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post #333 of 396
my times at 4400 were maybe 15-40s slower a big iff sence times change id say 4400-5ghz is no change in times took the screen shots for 4400 and 4800.


4400mhz


4800mhz

Edited by Bal3Wolf - 11/8/12 at 11:24am
post #334 of 396
So, a very slight difference which would amount to a few thousand ppd. No biggie, nothing compared to the slowdown that GJ was seeing.

So we still need to get someone to run a 7900 series on moderately OCd Ivy, should tell us definitively if PCIe 3.0 is helping Doc's ppd. or get someone with 7850 on sandy to run poem. Either should work.
     
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post #335 of 396
Quote:
Originally Posted by Biorganic View Post

So, a very slight difference which would amount to a few thousand ppd. No biggie, nothing compared to the slowdown that GJ was seeing.
So we still need to get someone to run a 7900 series on moderately OCd Ivy, should tell us definitively if PCIe 3.0 is helping Doc's ppd. or get someone with 7850 on sandy to run poem. Either should work.

haha if i win the 7870 tongue.gif i will run it to test.
post #336 of 396
Just a quick update - DiRT WUs don't run any faster with my card at x16 than they did at x8, as I would expect.

DiRT does not load the CPU so there is no transfer of information between the two - hence the PCIe speed is irrelevant.
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post #337 of 396
Thanks for update. So it seems there is some sort of Bandwidth limitation in POEM. Interesting

*Edit* Confirmation by POEM admin

"Hi there,

you're absolutely right. Since POEM@HOME uses both GPU and CPU for OpenCL calculations, bandwith is likely to be the bottleneck on modern systems.
It's a pity not to get the max out of these high end GPUs, but unfortunately we can't change that.

Best regards
Thomas"

I subsequently asked if going to PCIe 3.0 allows better performance.
Edited by Biorganic - 11/9/12 at 11:08am
     
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post #338 of 396
So it would seem I was right.

Bummer.


Oh well, I will try to OC my CPU and see if it makes much of a difference. Or at least I would if I could get any POEM tasks to crunch.
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post #339 of 396
Can't get tasks?
     
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post #340 of 396
so it sounds like a 7870 gets more usage cause its slower and does not demand as much bandwith as the 7900s do.
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