Quote Originally Posted by DilTech View Post
512bit bus with GDDR3 at 2000-2200 would be faster than any available ram on a 256bit memory bus....


256bits + GDDR5 gives you more bandwidth.

Look to R600 at 512bits. The formule didnīt work.
The PCB is much more complex, the core is bigger, you have more bus stops inside the chip.