OCC has published a new review on the Foxconn GeForce 9800GTX

The good news is that the Foxconn 9800 GTX does indeed provide a nice bit of headroom above the stock clockspeeds of 685MHz on the GPU core and 1100MHz on the memory. So if you look at the final results as a percentage, the overclocking results are pretty impressive. The increase on the GPU core came in at 152MHz, or about 18.5%, and the increase in the memory speed amount came to 116MHz, or just over 9%. The performance potential is there, you just have to go look for it. At this point, Nvidia's driver package does not allow for the fan speeds to stay at 100% when manually changed. Having tried several utilities to do this, the results just did not stick. So maximizing the overclocking capability will mean requirig that driver issue be resolved.

Foxconn GeForce 9800GTX Review