I'm running Win7 64Bit.
I just acquired for testing 2xHD6770. Not running crossfire, running a monitor on both cards.
If i start 2 miners, it will result in crash if i stop either one. If using Guiminers crash may occur already when starting.
When i quit a miner, things continue seemingly to work for 10seconds or so, and then halts. If i wait long enough system finally reboots.
Using drivers + catalyst from couple months back. Happens also on stock clock.
Also, why do they consume all power of a core? :O I got quite powerfull CPU (Best of old Core series, QX9770 @ 3.4Ghz) so that strikes quite odd as well