ATI RADEON HD 5570 On Portal 2

PC Specs: i5 2500 Sandy Bridge Quad Core @ 3.4Ghz Gigabyte H67 Motherboard ATI Radeon 5570 1 GB DDR3 RAM 4 Gigs of DDR3 G.Skill RAM @ 1600Mhz 500W CoolerMaster Power Supply 1.5TB Hitachi Deskstar HDD Acer AL2216W 22 inch Monitor