actually ahswath by 512mb ddr2 it means dat the card is 256mb and it expand to 512mb on sharing with RAM.u shud atelast get arnd 4k for the card as its market cost is 4.2K.
dude still 70 i too high for amd 64.i got amd 2800+ overclocked to 3200+ and my temp never goes above 40 . ah and me not got any thermal paste and anyhting.