Do those GTX 460 cards even work with modern titles? They aren't supported by modern NV drivers, that's for sure. (Fermi)
A card that old, if you haven't been cleaning the dust and hair and grime yearly at least, and re-pasting it every 3 years or so, is probably dead/dying from heat-death. Happened to a friend of mine, he never cleaned out his PC/video card, until his PC was crashing and blue-screening, by then, it was too late for the card.