The FX57 is faster for gaming today. 6-12 months from now when the first games that support multithreading start hitting the shelves the X2 will likely outperform it noticably. The 4800+ is allready roughly equal to the FX55 even when just playing singlethreaded games. Oh and, if you tend to have other applications in the background while your playing the X2 is arguably a better choice as well.