Hi guys, I'm new here, I was hoping somebody might be able to help me out. I bought an XFX 6870 last week (HD-6870A-ZHFC single fan) which I'm using in my Windows 7 x64 machine. It ran fine for a couple of days, played a little Black Ops at full settings without issue, until I decided that the stock fan settings were too aggressive/loud for my applications (I use this rig primarily for recording music). I edited the fan curves in the bios using RBE v.128 and flashed the card with Winflash seemingly successfully. However: a) The fan speeds were not changed at all (No big deal, I'll settle with using Afterburner) b) Sporadic BSoDs began occuring, during startup, during 2D windows stuff, during anything. I quickly flashed back to the original unmodified bios that I had saved initially, this time using ATIflash from a bootdisk to avoid any fuck ups, though this helped none. BlueScreenView seems to be reporting an alternation between watchdog.sys & dxgkrnl.sys as the causing driver. Using both the latest Radeon Drivers and the ones that came on the installation CD does not change anything. Doing a clean install of windows still produces the same problems and forcing a flash with the XFX HD6870 bioses on the database here rendered the card innoperable. When I took the card back into the store I bought it from (Without mentioning anything about me playing with the bios ) and the guy stress tested it with a variety of benchmarks it didn't have any problems. I would think PSU problems, except that it ran fine for a few days until I flashed the bios and a 600W PSU with 52A on the 12V rails ought to be plenty sufficient... Find attached the original bios and modified one, as well as the last few dump files. Any thoughts?