To measure the effect overclocking has on temperature, we used NVIDIA’s built-in hardware monitoring feature to watch idle and load temperatures. The load temps were recorded following a looped 3DMark 05 session.
As you can see, overclocking the SLI configuration has a profound effect on the cards, particularly under load. Idle temps went up by five degrees Celsius, from 49 degrees to 54. Under load, the delta was more pronounced, as stock temps went from 72 degrees to 80 once the master board was overclocked.
Overclocking lone 7800 GTX card bumped up the idle temp from 43 degrees Celsius stock to 50 degrees, while load temp peaked at 71 degrees.