The Palit HD4850 Sonic is an overclocked card built on a purpose built PCB. That purpose is to provide a card that is both stable and overclocks like gangbusters. It delivered clock speed increases of 15% on the RV770 core and a hefty 26% on the memory. OverclockersClub has done a few reviews on the ATI based HD4850 cards to show a wide range of performance with non reference cards with unique heatspreaders to just your basic reference video cards. Of the seven tested to date the Palit HD4850 is the cream of the crop. The three phase power design helps to get the most from this card. It just rocks. When pushed to the maximum this card gave the HD4870 and GTX260 a run for their money and and won in most instances. You just normally do not see that from a nice mid-range card. I have got to give Palit props for this card.