I've got massive instability issues on 6 of my 9 rigs.  I'm trying like crazy to keep them running but they just won't fold more than a few hours without manual intervention.  I've underclocked my GPU's to their lowest settings and they still will not run stable.  I've got six different computers that are having this issue and each of them are running two 290X TRIX cards.  Of the three remaining machines two of them are running the same GPU's.  I've got a list a mile long of all the things I've tried to get things stable and so far none have shown any improvement.  I'm still working on it.  

I've got a long thread going in the F@H forum and so far everything tried has made no difference.  It may not be fixable.  All the machines that have issues are using EVGA Z87 Classified motherboards so I've got a thread going there now as well.  I'm suspecting a BIOS setting or something but I have no idea.  I'll also start a thread on the AMD forum about it as soon as I get more time.

I've clocked all the GPU's back to much faster speeds  (core 940, memory 1200) but still slower than their default clocks.  So my overall PPD should rise again but it will fluctuate a lot due to the massive instability.  I would love to get this running properly though because my time around the machines is getting more and more limited so downtime when it happens will be longer.

I'll try to offset the longer downtime by scheduling forced restarts of the computers at set intervals.  Unfortunately the driver issues makes Windows so unstable I don't know if they will be able to restart on their own consistently.  It usually requires me to hit the reset button.  In any event, I'll still trying to get things running properly.

I've been so buried trying to keep things running and working I haven't even had time to post or sleep.  lol  On that note...  I'm going to have some beers!