Folding@home news 23rd - 30th May 2013

Biffa said:
Its not 16 cores though is it? Its quad cores with Hyperthreading, so 16 threads, but not all are full fat threads. Not sure what you are running underneath, but I know when I was running the SR-2 it needed 6 core/12 thread overclocked to 4.2Ghz or more to even make the cutoff for bigadv WU's
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Pedant :p I realise it's not 16 proper cores - I just used the wrong word. I know Ivy-Bridge is a big step up from the 1366 architecture but I would be surprised if a 4.5GHz Ivy-Bridge CPU with 8 THREADS was nearly double the speed (on some WUs) as 2x 3.4GHz 1366 CPUs with 16 THREADS. Both rigs are currently running 3 GPU clients which should cancel each other out.

Biffa said:
Not sure about the 4 card slowdown thing, not seen that before! IT could be memory? I know the new Beta client needs a full core for each GPU and windows needs to map the full memory of each card to system memory so you need at least 8GB of system memory for the 4 670's maybe thats whats causing the slow down. Did you track CPU and memory use whilst it was running?
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I shouldn't think it would be a shortage of memory - it has 24GB. I didn't run F@H with 4 cards in. I noticed the issue while I was overclocking and benching. I didn't see much point running F@H on a machine that could barely function as a desktop.

Biffa said:
Hmm.. might be memory settings, are you running the latest bios and are you using XMP memory settings? This thread might help: http://www.evga.com/forums/tm.aspx?m=1273783&mpage=1
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First thing I did (before even installing the OS) was to update to the latest BIOS (A58 iirc). I looked for XMP setting in the BIOS but couldn't find it, I can only assume it's not supported for my RAM. Never really played with the memory settings. Might have a bit of a play when I'm home next (away for another 3 weeks).
 
Stan_Lite said:
Pedant :p I realise it's not 16 proper cores - I just used the wrong word. I know Ivy-Bridge is a big step up from the 1366 architecture but I would be surprised if a 4.5GHz Ivy-Bridge CPU with 8 THREADS was nearly double the speed (on some WUs) as 2x 3.4GHz 1366 CPUs with 16 THREADS. Both rigs are currently running 3 GPU clients which should cancel each other out.

First thing I did (before even installing the OS) was to update to the latest BIOS (A58 iirc). I looked for XMP setting in the BIOS but couldn't find it, I can only assume it's not supported for my RAM. Never really played with the memory settings. Might have a bit of a play when I'm home next (away for another 3 weeks).
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I know, I know, don't teach your grandmother to suck eggs.. :p But sometimes even the uber-ereet miss the basics :o

So you didn't say it was performing like a dog before you even tried folding on it, did you (flinch) run memtest on it for a few hours just to check?

So is it only some WU's? Does it perform up to par or better than the other rig on other WU's?
 
Biffa said:
did you (flinch) run memtest on it for a few hours just to check?
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First thing I thought of. Did two full runs with zero errors.

Biffa said:
So is it only some WU's? Does it perform up to par or better than the other rig on other WU's?
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From observing the live PPD on HFM, it seems like some WUs are pretty even on both machines but some are about half. I had a look in the benchmark viewer on HFM but it's showing average PPD for the SR-2 as way way down at about 5k on some WUs with the 3770K at about 20k for the most part. Doesn't seem right to me. I'll have to have a look through the logs and try to get a better idea what's going on.
 
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