XFX 8800GT Alpha Dog (
640mhz core clock version) here.
Here's my experience so far.
4x AA 8x AFFEAR - crashes in 5 mins
Crysis - crashes in 10 mins
No AA no AFFEAR - crashes in 15mins
Crysis - crashes in 15mins
No AA no AF (Downclocked to Nvidia's revision clocks)No crash so far in 30 mins, will play longer soon.
Both tests are done with
70% fan speed with Rivatuner.
Max temp is about 65-67C
Could be driver issues, no diff with the latest WHQL certified and beta drivers.
These babies run hot. Since it's a "1 piece" heatsink fan design, the overall heat could be bad for the voltage regulators heat transfer/dissapation.
I'm very much anticipated for 8800GT coolers, but they carry quite a hefty, price.
Thermalright's HR-03 GT is about reasonable, say USD55.

Scary heatsinks for the VR chips tho. Had bad experience with AC's VR heatspreader, not effective.
Zalman requires 2 items (VF1000 & RHS88), total of USD85, ouch.

But their component that cools down the RAM + VR chips is very impressive. A one piece solution, talk about proper distributed heat spreading.