Hello all. First post here. I'm having a bit of an overheating issue with my BFG 8800GT 512MB SLI cards. Both of them are the OC 625Mhz models. System specs are: AMD Athlon 64 X2 4600 Windsor MOBO: Asus M2N32SLI-Deluxe Nvidia chipset memory: Patriot Extreme Performance 3GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) (3 sticks, 1 GB each) Power Supply: HIPRO 600 watt BFG 8800GT 512MB SLI 625Mhz. Stock cooling fans and heatsinks removed and replaced with Zalman VGA Cooler VF700-Aluminum/Copper fans and heatsinks. Windows XP 32-bit SP3 Video drivers: Nvidia forceware 182.08 So the story goes: I've had my current system for several months now (I got my second 8800GT last September). After getting the second GPU I also bought and installed the Zalman coolers. Everything was running fine after that. I was getting an average of 70-75C while running games of high graphical intensity and idling at about 55-56C. About a week ago I downloaded Prince of Persia from Steam. I was playing it and generally enjoying myself when the monitor got this red mosaic effect on the screen and froze about 4 seconds later. Not just the game froze, but Windows itself froze as well. I had to hard reset of course. I went back into the game and resumed playing. About 30 minutes later the same thing happened. I hadn't been having any other problems with games at the time so I assumed that perhaps Prince of Persia had suffered from bad PC port syndrome. I grabbed new video drivers (182.08) where previously I had been running 180.48. Same result. After that I decided to go back to playing Fallout 3. This game had previously been extremely stable for me so when I started getting freezing issues while playing it I became suspicious. I ran Rivatuner 2.08 while playing Fallout 3 and noticed that my cards were getting up to 100C! Since you can boil water at that temp I realized this was a problem to say the least. Idling I was looking at about 70C. This is way higher than it was previously. So here's the things I've tried since then: 1. Take a can of air to the entire computer case. I didn't have much dust on anything at all so this didn't accomplish much. 2. Remove the Zalman coolers, emulsify the Arctic Silver that was on them and reapply the thermal paste and reset the Zalman coolers. 3. Swap video cards slots. My primary card is now my secondary. I did this to see if one card being the primary might cause the problem. After doing that I'm running at about 85C for the primary card and 58C for the secondary card while under load. While idling the primary is about 62C and the secondary is staying at 58C. I know this makes it seem like SLI is not being used, but I have SLI enabled in the nvidia control panel so it should be getting used. Even if SLI is not working, this doesn't explain the increased temperatures. It seems like it's still getting rather hot when playing games. Now I have considered that we're getting into the warmer months so I suppose it would run a little warmer than previously but a difference of 10C? And I'm still not sure why it started getting up to 100C, other than maybe the fan/heatsink had come loose and weren't gathering all the heat that they were supposed to. Is there anything else that I should check? Can a power supply starting to go bad cause any of this? Does this just happen after a certain period of time to GPUs? Also, the fans are already running at maximum RPMs before anyone suggests adjusting them. Thanks for any help that can be offered.