I recently had a Thermaltake 750W Toughpower fail and RMA'd it and received a Thermaltake TR2 RX 850W power supply as a replacement. Since installing the new power supply I have had problems with it powering off, no warning or BSOD, as soon as a graphics load is applied when using my 8800 Ultra gpu. I have tested the system with an old nvidia 7600 gpu and the system runs fine even under gaming loads. I have tested the memory by removing sticks and testing all combinations. I have reapplied thermalpaste to my cpu. I'm running the latest nvidia drivers and Windows 7. CPU is AMD 4800+. Any thoughts? Is there a way that I can find an error, temp or voltage warning report? Thanks!
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TT PSU's are known to be "not the best around". Tr to borrow
Try to borrow at least a 650 watt PSU from Corsair, Antec, Seasonic or XFX to see what happens.
Also, try downloading a GPU program like MSI Afterburner, which will report the temp of the GPU.