Where the Radeon HD 7900 cards were impressive from a pure performance stand point and the Radeon HD 7700 cards brought new features and performance per watt to the sub $200 market, the HD 7800 cards are really the ones we think warrant the most attention from gamers. For $250, the Radeon HD 7850 offers a significantly better gaming experience than the GTX 560 Ti from NVIDIA while offering enough overclocking headroom to reach towards the GTX 570."
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