Room temperature is 21.5c. It's a sunny day here but the PC is in a well ventilated, shady room. The radiator sits in clear air as pictured earlier in the thread.
The 8800GTS 640mb card clock speeds are still at Core 648mhz/ Shader 1620mhz/ Memory 1000mhz.
After 1 hour of the Nvidia smoke demo the card temperatures had risen to core 53c/ card ambient 43c.
After 2 hours the card temperatures rose to core 54c/ card ambient 45c.
I then stopped the test.
8800GTS 640mb load temperatures 2 hours of Nvidia Smoke Demo
When looking at idle temperatures it takes a lot longer for the passive watercooling to drop back down to idle again.
You need to give it a good two hours of idling after a benchmark before the card will return to its actual idle temperature.
You have to give the whole room a chance to cool down too. After stopping that Nvidia smoke benchmark the room temperature half an hour later has risen by 0.2c.
That's probably one of the best reasons for changing the 2D clocks: It will keep your room a bit cooler in summer as the card puts out less heat!
What room temperature did you do the test at? With passive cooling temperatures are massively affected by the ambient room temperature.
