Hmm... you know- my 5950U did the same thing with FEAR. With my card it was a BIOS issue. For some reason FEAR didn't like the ASUS proprietary BIOS that much.
After researching, I found that flashing to another 5950U BIOS solved the problem. Though I have yet to try it myself, you might see if maybe another BIOS in your card would help.
Also, try underclocking the card just a bit. Maybe uninstall the video card drivers, and then uninstall the mobo drivers- then reinstall the mobo drivers first and the video card drivers last and see if that helps.
That is kind of strange that the card is doing that though... I highly doubt it is going. My GF has a Ti4200 in her rig and it is going strong.