I have tried voltages anywhere from 1.05 - 1.2 and clocks all the way up to 975 mhz. When I get home I will try as you suggested. Also, It may be a good idea to reseat the WB. Would I need to get new thermal pads?
At first I was overclocking with both that is when I started noticing the issue. This happens even if I leave the clocks at stock and only increase the voltage. It is very weird because I had it stable in BF3 multiplayer for over an hour...
Here is the rail distribution: 12V1 to the 4 pin 12V ATX (which is split from the 8 pin EPS), 12V1 & 12V2 to 8 pin EPS, 12V2 to modular PCI-e connectors, 12V3 to mobo ATX & fixed PCI-e connections, 12V4 to drives. 18 amps per 12v...
My computer was running fine:
Xeon W3520 @ 4GHz
3 x 2Gb DDR 3 1600
6950 1GB (had this overclocked)
Koolance Exos 2 powered from power supply
Thermaltake Toughpower 750w ~ 4 years old
I recently switched to a GTX 580...
7870 --> http://www.amazon.com/Gigabyte-Mini-Displayport-PCI-Express-Graphic-GV-R787OC-2GD/dp/B007PJVB3Y/ref=sr_1_25?s=electronics&ie=UTF8&qid=1352568654&sr=1-25&keywords=7870
Or, try and pick up a used gtx 580 for ~$200 on ebay