Overclocker Chew* set a new MHz record for AMD's new dual-core processors, he boosted the frequency of the Athlon II X2 255 from 3.1GHz to 4800.1MHz with a cascade cooler. The overclocker also reports that AMD's stock HSF was enough to get the chip to 4050MHz.
On the bench built by Chew*, the X2 255 reached 4800.1 MHz, with a BClk of 320.01 MHz, multiplied by 15.0, the chip's natural multiplier value. A VCore of 1.696 Volts could be set.
The processor was cooled using a cascade cooler. The bench consisted of an Athlon II X2 255, Gigabyte GA-MA785GPMT-UD2H motherboard - another mainstream component which proved its mettle, OCZ DDR3 1600 MHz Black Edition certified memory, PC Power & Cooling 750W PSU, and ATI Radeon HD 4890 graphics.