Overclocking the R4850 512M
Per our usual process, we set out to see if the R4850 512M sample we tested was a good overclocker. Because of the card's efficient cooler, we were optimistic that we could push the core and memory clocks beyond the defaults (625 MHz and 993 MHz, respectively) to respectable new heights.
After slowly bumping up the clocks and checking stability with 3DMark Vantage and Crysis, we finally hit a wall with the GPU core at 685 MHz and the memory at 1,100 MHz, a 9.6% and 10.8% bump, respectively. You can see a couple examples of the resulting performance increase in the graphs below. As always, keep in mind that your mileage will vary, and overclocking may void your warranty.