NordicHardware posted an article where OC guru Robert 'crotale' Kihlberg overclocks Intel Core 2 Extreme X6800 using a series of different types of cooling.

This is our third detailed overclocking article here at NordicHardware and we will thoroughly dissect Intel's top model, Core 2 Extreme X6800, in the same manner as we've done with AMD's FX-57 and Intel's Pentium 4 660. As usual we will use a number of different cooling solutions ranging from regular air cooling to more extreme compressor setups.

Overclocking Intel Core 2 Extreme X6800 Review