Elite Bastards posted their NVIDIA GeForce 9800 GTX preview

This brings us to those clock speed differences, and the one point of interest for the vast majority of users away from 3-way SLI support. With a reference GeForce 8800 GTS 512MB sporting a core clock of 650MHz and a shader clock of 1625MHz, we find that the GeForce 9800 GTX only offers a very small boost in these areas, with a reference part utilising a 675MHz core clock and a shader clock of 1688MHz - Hardly earth shattering stuff. Memory clocks fare a little better, with the GeForce 8800 GTS 512MB's 970MHz memory clock surpassed by the use of 512MB of 1.1GHz (2.2GHz effective) GDDR3 modules.

NVIDIA GeForce 9800 GTX preview