7900 GTX has a standard heat pipe cooler and it runs even cooler than it used to before. The card runs at 650 MHz now but it can get to 700 MHz as well, you just need to overclock.
7900 GT uses a Nvidia recommended standard cooler that doesn't cool the memory. But obviously the memory doesn't get that hot anyway. We don't know about the price of these cards. There are a bunch of them at Gainward's booth. Here is how they look.

Gainward 7900 GTX 512

Gainward 7900 GT 256 MB