Hi, I'm new here. My 6870s in crossfire crash after a few mins of gameplay and less than a minute of furmark. the sounds like the top card shuts down and the display goes black. I set the Fans to 100% and the top card doesn't exceed 60 degrees. I tried swapping the cards and tried them on a different board as well. Seems like I'm not the only one with the issue. There are a few people who have that issue, but it seems like it only happens with the gigabyte cards. I tried a bios update for the cards, but they had the newest bios on them, I tried flashing them with ASUS bios and I still have the issue. I have no idea what to try now. Intel Core i3-2100 3.1Ghz Gigabyte H67A-UD3H 8GB DDR3-1333 Gigabyte Radeon 6870 1GB WindForce 3X 2TB WD Caviar Windows 7 Professional x64 Coolermaster GX650W Bronze PSU. Could it be the PSU? It seems like it should have no problem running the system and as I said, other people online have had the issue too, some with better power supplies.