nVidia 7900 GT Card Roundup @ Trusted Reviews

Snip: However, considering these are all based on the reference design that most manufacturers use, this does give a fairly good indication of what you might expect. The lowest overclock out of these cards was 560MHz on the core and 885MHz on the memory. Both of these are still significantly over the stock speeds and demonstrate how good nVidia?s yields must be.

Full review @ Trusted Reviews