I'm assuming this is a videocard issue, but I figured I'd ask here and see if maybe these games are just a pain in everyone's ass.
CPU: Intel I5 750 (2.6g quad core, I believe)
Video: ATI 4870
RAM: 4 gigs DDR3
Windows 7 64 RC
Now, what's happening is a full system hang. Nothing responds, monitor goes black, and sometimes a weird sound will come out of the speakers, if any sound at all. Hard boot is the only fix.
This happened in Dragon Age with some frequency (typically, about 30-50% of the time I'd play)... though it usually wouldn't happen until at least 2-5 hours in. With Borderlands it's especially bad... I'll make it 5-15 minutes in before everything goes down. I've never made it farther than the fence you jump over during the intro level with the robot. And let me tell you, that little bastard gets annoying after a while.
Games I don't recall having this issue with include Crysis (though I never put more than an hour into it, because it honestly bores me), Fallout 3, Assassin's Creed, Oblivion and Quake 4.
What do you guys think it might be?
Edit: I've got the newest video drivers, too.