Mobile graphics card are typically a generation behind their desktop counterparts. The Radeon Mobility 5870 is actually based on the Radeon 5770 and is underclocked. For Nvidia, the GTX260M, GTX280M and GTS360M are all based on older 9800GTX desktop cards, and are all behind the Radeon in performance. The GTX480M is an underclocked GTX460 as well.