GTA IV Gameplay on HD 6990 HD

Everything on max except Shadows I find the game becomes very glitchy on any AMD card with this on the highest setting so I have set to Medium. Also I left my XBOX pad at a friends house so keyboarding it for now :) Please Subscribe! Motherboard: Asus P8P67 Pro CPU: Intel Core i7 2600K @ 4.5GHZ Memory: 8GB 2000MHZ Corsair XMS3 @ 1957MHZ CPU Cooler: Corsair H70 GPU: Sapphire HD 6990 @ Stock clock speeds Case: CM scout Case (Modded to fit GPU) Display: LG E2750v 27 Inch Pad: XBOX Controller for Windows PSU: Cooler Master Silent Pro 850w