Though AMD has equipped various laptops with the ATI Mobility Radeon HD 3000 series, it will be now giving laptops the Mobility Radeon HD 4000 series chipset. These new chipsets are based on the 55nm architecture and is the only mobile graphics processors that can deliver up to 800 stream processes and GDDR5. This performance can be substantial over the 3000 series, as the highest line of chipset in that line was the HD 3800 series, which could only deliver up to 320 stream processors. Overall, gamers should definitely see a great performance increase in their games over other manufacturer chipsets provided by companies like Intel. AMD is also claiming that the 4870 chipset can provide a sixty percent increase in performance-per-watt when used with technologies such as ATI PowerPlay, ATI PowerXpress, and ATI Switchable Graphics
Source : http://www.overclockersclub.com/
