which card work best for crysis and crysis warhead on high setting without no AA filter and AT filter, ATI Radeon HD 5770 or Nivida Geforce GTS 450? my computer sepcs: Intel Core i3-530 2.93 GHZ, 6gig DDR3 Dual-channel, 20 inch widescreen monitor "1600 bt 900" max. resolution and 500 watt with one pci-e "power cable". I already had ATI HD 5770, should I return and get Nvidia GTS 450 or not? please help.