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rejected work units?  

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pazsion
(@pazsion)
Active Member Customer
Newbie

i saw this mentioned in another thread, the only time i've ever seen rejected wu in folding or boinc, was when i set the time off, or tried to overclock.

instability wu's does not like.

When did you notice it?

did you fix it?

are you overclocking?

are you over or under-volting?

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Posted : 21/07/2016 6:54 am
wilding2004
(@wilding2004)
Estimable Member Customer
Newbie

Overclocking too far is the most common cause of failed WU's. Although there can be other reasons for rejected WU's.

An overclock that is game or benchmark stable isn't the same as being f@h stable. In a game you wouldn't notice if a memory or gpu error causes a pixel to be the wrong shade of green. But that same error in a f@h WU could render the results worthless.

I've been folding for over 12 years, and have pushed everything from a 450mhz pentium 2, to a GTX 970, to the limit to see what they are capable of. In my expereince the best approach is to run at stock speed and stock voltage with good cooling.

Any extra performance you might get through overclocking, will be lost by the extra downtime that will undoubtedly follow it.

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Posted : 21/07/2016 11:09 am
wuffy68
(@wuffy68)
Admin
Newbie

@wilding2004 wrote:

Overclocking too far is the most common cause of failed WU's. Although there can be other reasons for rejected WU's.

An overclock that is game or benchmark stable isn't the same as being f@h stable. In a game you wouldn't notice if a memory or gpu error causes a pixel to be the wrong shade of green. But that same error in a f@h WU could render the results worthless.

I've been folding for over 12 years, and have pushed everything from a 450mhz pentium 2, to a GTX 970, to the limit to see what they are capable of. In my expereince the best approach is to run at stock speed and stock voltage with good cooling.

Any extra performance you might get through overclocking, will be lost by the extra downtime that will undoubtedly follow it.

Well said. I try to tell people "this is a war on cancer, not a game of Battlefield" 🙂

My fear is - and this may be irrational - an overclocked system could cause FAH to miss a key intermediate state of a molecule by exposing an undocumented bug/flaw in OpenMM or GROMACs molecular simulators. This is the software that runs underneath [email protected] and simulates Newtonian equations of motion for systems with hundreds to millions of particles.

In gaming, most people wont notice a missing pixel or a lost frame, but imagine what the implications of a missing folded intermediate could mean in a simulation trying to uncover the root cause of, say prostate or breast cancer.

It's a personal choice and FAH does say somewhere it's okay to overclock "within reason", but for the extra few points and the risk of returning bad work units (thereby reducing your points) ... it's just not worth the effort unless you're system's cooling is VERY tightly controlled or in a temperature controlled data center.

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Posted : 21/07/2016 12:06 pm
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