"Today’s graphics processors require computing power more than memory bandwidth and developers of graphics chips will consider whether possibly more expensive XDR will deliver tangibly higher performance compared to GDDR4."

Rubbish. Nvidia 6800 is clearly bandwidth limited even at the current clock speeds. That's why Nvidia only included 8 color blend ROPs out of 16. Having only half the pipes doing blending is completely masked by the low memory bandwidth. Fillrate & bandwidth are still king. We're not ALU limited yet, esp when dealing with 1600x1200+ & AF/AA...