Next Nvidia high end chip will be the G81

[Tefra]

Nvidia holds the crown with G80 and the R600 is still over a month away. R600 won't win in all categories, so Nvidia might still be fine with an overclocked G80. Overclocked G80s are coming in volumes and we got a hold or few that we are testing at press time. Unfortunately, EVGA doesn’t offer overclocked G80s in its step up program. G81 might not show its face that soon, but Nvidia is at least experimenting with a new process. We would be very surproised if we see high end 65 nanometre before the end of the second quarter but more realistically later than that.

Source: theinquirer.net