Have the X1950XT AGP with the TEC but it overheats and crashes around 93C at stock 648/702. Put some arctic silver ceramique on the HS/GPU which brought the temps down some but it still crashes out on me in the ATI Tools and ATI Tray Tools 3D renderers. The cooling seems to be efficient as it drops quite quickly upon exit from the renderers. I have it running on an Asrock 775i65G with a C2D 6300. I have tried running it with dual PSU's so it is not a PSU issue. Hiper Type r 580 2 12v rails 20Amp and 18 Amp and a Colors 600W with 30Amp 12v rail. It seems to be a heat problem. I do not seem to get the Voltage adjustments in ATI Tray Tools or ATI Tool that others seem to get to see if lowering voltages would help out. Runing Cat 7.3, Ati tray tools 1.2.6.964 and ATITool 27 b1. The last voltage slot on ATI Tool says it is an unknown voltage. ATI Tray tools lets me set GPU volts in Overdive 3 menu but it loses it. I am stumped. Any help greatly appreciated.