Ho all, I recently purchased new parts to build a new PC with, will be shown below, and I'm having some MAJOR problems when I try to game. Due to the fact that that is why I purchased what I did, I have needless to say, become rather frustrated. I am a bit of a WoW head and shortly after getting all of my new components and assembling the machine I began playing. Everything working like a charm, fast as can be, then I powered off the machine for the night and went to bed. Next day, upon waking up, I powered the machine on and again got into WoW. Things then took a turn for the worse. After about five minutes artifacts on the GUI suddenly showed up around my cursor and within a few seconds the system crashed. No BSOD, just restart. Thinking it might be an overheating problem I downloaded Speedfan to check the heating of the machine. It was running a bit hot so I kicked up the fan speeds and went back to work. Nothing helped, constantly crashing, I now thought I might have a bigger problem than overheating. The next day I visited a friend of mine who is a little more tech savvy than myself and we began our 8 hour trek (with multiple food breaks included) into determining the problem. Ran Memtest and all RAM was good, ran PC Check on video RAM and Motherboard; everything passed. Jumped into windows and ran Prime95 and no crashing there either. CPU was still mighty hot, but the system did not crash. I decided that perhaps it could be a heating issue and purchased a new Zalman heatsinc which cooled it down considerably. We soon noticed that the voltages of the PSU were a little low (as shown on speedfan) with Vcore at 1.26v +12v at 9.98 and AVCC around 3.33. Thinking that could be the problem I grabbed a 700 Watt PSU and a GPU specific 450 Watt Visiontek PSU. No change to the voltages at all. Again ran Prime95 and it continued to pass each test without crashing. Installed a different game and it also crashed after about 5-10 minutes. All drivers are up to date as well. I'm about out of options and I am now thinking something could be wrong with motherboard, perhaps the PCI-E slot...specs are: Motherboard XFX MB-N780-ISH9 CPU: Core 2 Quad Q6600 RAM: 4gb Dual Channel Corsair GPU: Nvidia XFX Gx2 PSU: BFG 650 Watt and Visiontek 450 GPU specific PSU OS: Windows Vista Ultimate 64bit HDD: 2 x Western Digital 320gb HDD (SATA) Optical Drive: Samsung DVD+RAM (EIDE) Any thoughts would be excellent!!