I was at a LAN party a few weeks ago and while we played Unreal tournament, BF1942, and Quake III my vid card began freaking out during BF1942, but not the other two. The environment would disappear: mountains, vehicles, people, but I could always see myself. This is the only time I have issues with the vid card at all. What can be done? It is a BFG Ti4200 128mb DDR.
EDIT: No overclocking done.
EDIT: No overclocking done.