FUD Zilla reports ASUS has introduced its Radeon HD 5800 series graphics cards, both the Radeon HD 5850 and Radeon HD 5870 will be available in a bundle with or without DiRT 2. The cards aren't factory-overclocked, but they come with a Voltage Tweak feature to automatically get some extra performance.
With no voltage changes applied, Asus' graphics cards are running at reference 850/725MHz for the core and 4800/4000MHz for the 1GB of GDDR5 memory. When Voltage Tweak comes into play, the HD 5870 can be overclocked to 1035MHz for the GPU and 5200MHz for memory by just raising the voltage from 1.15V to 1.35V. With the HD 5850 it gets even better as it can be overclocked via Voltage Tweak to 1050MHz for the GPU and 5200MHz for the memory by raising the voltage from 1.088V to 1.4V.