Nvidia Geforce
Download and install any Detonator driver set 61.77 or above. Under the Performance and Quality display properties settings enable application controlled anti-aliasing, application controlled anisotropic, vsync disabled and set image settings to performance or high performance. If you wish to tweak outside of the options available in the standard display panel then download a Geforce tweak utility such as NVMAX or the excellent Rivatuner. 



ATI Radeon
Download and install Catalyst 4.8 or above. Under the display properties enable application controlled anti-aliasing, application controlled anisotropic, vsync disabled and set image settings to performance or high performance.