Article Mistake

Taken from here.

8800 GTX's use a 900 MHz (1800 MHz effective) memory clock. I think when NVidia switches to GDDR4, the cards will see a substantial performance increase because the G80s really rely on the high memory speeds for performance (because of the single action per clock cycle on the unified shaders).

That's true another part of the core is running at 1.35 Ghz (the shader clock) but nVidia has reported that they will switch to GDDR4 memory too. I guess we will have to wait and see.