[solved] 4870 CrossFire problem! Hi, Before going into detail about the problem, this is my rig: CPU: AMD Phenom II x4 955 BE Memory: 4GB OCZ GPU: 2 Sapphire HD4870's running in crossfire (this is not a single 4870 x2) PSU: Corsair 850W OS: Windows 7 64bit *Nothing is overclocked, all has been reset at stock clocks after CPU+memory OC was thought to cause problems* So, the problem is that when playing certain games my screen freezes, artifacts and sometimes my whole rig crashes and i get the dreaded BSOD. It's been going on for about a year, RMA'd one of the cards since 1 was actually defective, the replacement had upped cooling on it so all was well. Playing Bad Company 2, or L4D I get the artifacting where my screen looks like its shattering. Thought cooling on the second card was a problem, upped it to the Accelero S1 rev2 + Turbo Mod. It lowered temps by 15 C at idle and 10 at load. Both cards run within about 5-6 degrees of each other at load and 2-3 at load. Thought the second card may also be botched so I took it out. On 1 card I can run both games + others without problems for over 4 hrs. Tried the second card, I can run the games over 2-3 hours (didn't have time to test more). The cards seem to only crash in CrossFire. I tested with Crysis and Crysis warhead running in CrossFire and i played for 6 hours without issues. Any and all help would be appreciated.