Borderlands intermittent freezing

So I'm trying to play Borderlands on the laptop in my sig, and after about 30 mins to an hour the graphics freeze. Sound keeps on playing, but the "action" stops as well; no matter how long I leave the game in this state and who was shooting at me, I don't die and when I fix it nothing has changed. If I ctrl-alt-del out of the game and then back into it, it's good for another hour or so before it freezes again and the same thing fixes it.

I do have the GPU slightly undervolted (1.1v down to 1.0v), but running at stock clocks. I haven't had an issue with any other game I've played, even for hours at a time (Crysis, Crysis Warhead, Bad Company 2, ArmA 2, CoD4). I'm thinking it might be a driver issue (or else my 5730 is such a bad chip it can't even take a slight undervolt), as I'm running the stock GPU driver that came with the laptop, which is from Septemper 2010, and I'm sure even then it was based on an old version. I tried downloading the 10.10 mobility drivers from AMD but they kept crashing while on the desktop, so I went back to the Lenovo ones without any more problems.

Does anyone know how I can get the latest AMD drivers (10.11 I think?) to work without crashing, so I can at the very least rule out drivers as the cause of my problems?

 

It just froze again re-flashed to stock voltage, so I think that safely eliminates that as the problem. Next I suppose I'll try GPU drivers and see if the newest AMD ones are more stable than the last set I downloaded.

 

are your temps fine? download GPU-Z and track your clocks to see if they're bouncing around while playing. did you undervolt your for any particular reason other than reducing heat?

 

GPU temps hover around the high 70s-low 80s. I undervolted purely to reduce temps. However, I flashed back to the stock voltage and still experienced freezing. In fact, the GPU got hotter than this while playing ArmA 2, but there was no freezing in that game. I have updated to the ATI 11.2 drivers and so far so good, killed Skagzilla (how any overgrown armadillo-dog can survive 44 (or was it 48?) rockets to the face at only half health is beyond me) and Mad Mel (Max? and in an arena that resembles Thunderdome? no, that would be too obvious...) without issue and hopefully there won't be any BSODs in 2d mode this time.