512MB DDR3 is pretty enough to feed HD 4850, but Powercolor have gone xtreme, directly push their non reference HD 4850 2GB. Ramdisk on VGA card, anyone?
Actually Powercolor still uses AMD’s reference PCB, (you can see AMD name after the FCC mark), but based on the PCB they make lots of changes. It uses ZeroTherm full cooper GPU cooler with CVVT technology(Continue Variable Velocity Timing, just another Korean innovation), changed DRAM module to high capacity chips (detail still known). The card runs slightly higher than reference one, clocks at 665/2000MHz(core/memory)
The announce date and the price still unknown.