Here's a look at the performance improvements:
3DMark Vantage DX10 – performance gains of up to 5% for Single and Crossfire mode. Performance gains were noticed on HD46xx, HD4550 and HD4350. Call of Duty: World at War DX9 – performance gains of up to 21% for Single and Crossfire mode. Performance gains were noticed on all Radeon HD48xx. Crysis DX10 – performance gains of up to 25% for Single and Crossfire mode. Performance gains were noticed on all Radeon HD4xxx. Crysis Warhead DX10 – performance gains of up to 13% for Single card mode and up to 16% for Crossfire mode. Performance gains were noticed on all Radeon HD4xxx. Devil May Cry 4 DX10– performance gains of up to 6% for Single and Crossfire mode. Performance gains were noticed on all Radeon HD4xxx and HD38xx. Fallout 3 – performance gains of up to 15% for Single card mode. Far Cry 2 DX10 – performance gains of up to 10% for Single card mode and up to 57% in Crossfire mode. Performance gains were noticed on all Radeon HD4xxx and HD38xx. FEAR DX9 – performance gains of up to 6% for Single and Crossfire mode. Performance gains were noticed on Radeon HD4870X2 and HD4870. Hellgate: London DX10 – performance gains of up to 6% for Single card mode and up to 10% for Crossfire mode. Performance gains were noticed on all Radeon HD4xxx. Left 4 Dead DX9– performance gains of up to 10% for Single card mode and up to 5% for Crossfire mode. Performance gains were noticed on all Radeon HD4870 series. Lost Planet Colonies DX10 – performance gains of up to 10% for Single and Crossfire mode. Performance gains were noticed on all Radeon HD4xxx and HD38xx. Prey OGL – performance gains of up to 15% for Crossfire mode. Performance gains were noticed on Radeon HD4870 1GB products, HD46xx, HD45xx. S.T.A.L.K.E.R.: Clear Sky – performance gains of up to 10% for Crossfire mode. Performance gains were noticed on all Radeon HD4xxx and HD38xx. Unreal Tournament 3 DX9 – performance gains of up to 18% for Single card mode and up to 15% in Crossfire mode, especially in cases where AA is enabled. Performance gains were noticed on all Radeon HD4xxx and HD38xx.