Zotac maintains a series of significantly overclocked graphics cards within the AMP!-series. Latest development is the Zotac GeForce GTX 560 Ti AMP!-Edition on NVIDIAs current GPU series. HT4U.net shows what it can deliver and how it behaves in everyday situations.
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips