I have same watercooling setup as Rabor, but with 3 x Scythe Flex fans at 800rpm... I get temps of 52-54°C at 3.8Ghz with 1.43 volts, though I got a B stepping of the 6850...

Also note that the 8800GTS doesn't put out so much heat as the Ultra (calculate a few degrees there), my GTX idles at around 32°C, now testing the Q6600 GO and the vidcard idles at 36°C...

Also you use the innovatech block, isn't that more restrictive in comparison to EK ones ?