geff33
my guess is a power supply issue, Ive been caught out twice b4 with this problem !
You have 2 pumps, 2 rads and associated fans, all the fans that go with the case etc, its real easy to over load 1 rail and unbalance the psu, do you have any fans daisy chained together ??, also have the cards got their own decicated rails ??
As you have a second psu available just try this out, use one psu for all auxiliary stuff, pumps fans drives etc, and leave the 1200 in charge of the board only and the cards, if this makes any differnce you have 2 options, perminently run 2 psus using a relay or re do your distribution using just the 1200 ( should be plenty if your carefull how you connect everything)
Thanks for the suggestion fmsam. I followed your advice and installed the second PSU. Unfortunately the problem remains. One thing I noticed though when I boot at safe Mode and go to device manager , it says under resources of the 2nd GPU that is giving me all the problem, the device is not using any resources because it has a problem!