Know Your Videocard's Warranty
Familiarize yourself with your videocard’s warranty before overclocking it—some manufacturers are more tolerant of overclocking than others. Asus, for instance, will flatly refuse to honor a warranty on a videocard that’s been overclocked after leaving the factory. Diamond’s senior marketing manager, Lisa Legnante, told us, “Overclocking is not promoted or recommended; however, we know that it happens.”
EVGA and XFX, on the other hand, have a liberal attitude about the matter. “EVGA will warranty cards that a customer overclocks as long as there is no physical damage to the product,” said EVGA’s director of technical marketing, Joe Darwin. EVGA and XFX both allow you to change the card’s cooler, too—provided you don’t damage the card in the process and that you retain the original cooler in case you need to return it to the manufacturer.