The guy behind Skulltrail and Skulltrail 2 projects François Piednoel, and the rest of its performance analysis group, have showed us Nehalem, Core i7 PC water cooled all the way to 4.61GHz.

They did it on an Intel desktop motherboard powered by Intel's desktop control center, something that lets you overclock from Windows. The voltage was all the way to 1.44V, whereas the chipset needed 1.21V.

Host frequency clock, something that we used to call FSB speed of the machine is 144MHz, which multiplied by the 32 multiplier gives you the 4610MHz number.

The CPU temperature was at 61 degree Celsius while the CPU Voltage regulator was at 31 °C and chipset at 41 °C. The clock is much higher than the one you can score on Phenom II, but Intel’s CPU used here is much more expensive.

Nehelem, Core i7 is definitely better water overclocker than Phenom II but Phenom II still overclocks higher at 6GHz+ domains.