I've had 2 GTX570s die in my computer over the past couple weeks. The first card was on that i had running fine for months, i got the new version of MSI Afterburner one day and decided to see if I could bump my core clock up 10mhz and when i tested it in OCCT my computer shut completely off. I powered back on and lowered the clock back down, tested again and it shut off again. I set everything to stock and tested again, this time with Furmark and it shut off again. This time when i turned the computer back on there was no video signal and the GPU fan was running full blast. I put this GPU in another computer and it behaved the same way, so I RMAd the card back to EVGA. While awaiting the replacement, my friend brought his rig over and put his GTX570 in my computer and we set it to the clockspeeds that were stable in his computer, ran OCCT for a few mins to make sure it wasnt going to error right away and it seemed fine, temps were low. But we noticed that my PCI soundcard and onboard NIC were both missing. Tried restarts and checked bios but no luck. Shut PC down, removed soundcard, turned back on and the NIC showed up again. Shut down and put the soundcard back in and turned it on and the soundcard showed up again. Played BF3 for a while and got a display adapter/driver crash error, so I lowered the clock 50mhz and then played for the rest of the night no problem. The next day I wanted to see what was up and bumped the card back up 50mhz and started a OCCT test and it shut my computer off completely. Turned back on and set everything to stock and tried OCCT again and it shut off again, the instant the test started. Well, this card died too, no video signal in either computer, and every few times we would try turning the PC on with the card in it the fan would run at max fanspeed, but not every time like the other card. I was thinking "ok this seems like a textbook PSU issue" but then i got my PC running on the onboard video and noticed that the onboard NIC was missing again but the soundcard is fine. i tried everything i could think of to get it working again but nothing has got the NIC to start working again. So i have a Corsair AX750 PSu and a new GTX570 showing up tomorrow, but i'm worried that i'll put them both in and then still have the same problems an the GPU will get fried like the others. The fact that the onboard NIC died and the soundcard was missing for a while makes me worry that its the motherboard somehow killing these cards.