PCShopTalk posted a review on the Intel Core i7 920 Processor

Running the Q6600 at 3.6GHz and at 1.6V did generate temperatures as high as 64.3C even with Water Cooling (Cooler Master Aquagate Max). Unfortunately, this was the only setting that the Q6600 would like. The Q9400, on the other hand, only reached 51.7C under full load while it was overclocked at 3.84Ghz at 1.4125V. While the voltages on the Q9400 are lower than the Q6600, the Q6600 hit 53.5C under stock speed and stock voltages (1.3V). The Core i7 920 however reached a temperature of 66.25C under full load when it was overclocked to 3.8GHz.

Intel Core i7 920 Processor Review