"When it comes to the decision of upgrading to the latest and greatest, the PowerColor PCS+ HD 5870 sure doesn't make that decision easy. In some benchmarks, it pulled ahead, and in other game which highly rely on tessellation, it fell behind. Where the decision comes in is whether the difference in your mind is worth the US$50-$70 for a couple frames per second."
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