IT"S TOO EXPENSIVE to build a card that will have 500/1000MHz clock and still have more than 128MB memory and sell it for less than $200. At least this is how Nvidia feels. A 128 Mbit memory clocked to 1000MHz still costs too much. As for a 6600 standard card clocked at 300MHz core and only 500 MHz memory it won"t be any problem to make a 256MB card and sell it to all that worship at the altar of massive amounts of memory.