X-Bit Labs has their hands on an Asetek Vapochill XE.  Not only they are reviewing it, but seing how high they can push their collection of P4’s.  Benchmarks too.
Today we are going to offer you an unprecedented material devoted to super-extreme overclocking of the top Intel Pentium 4 processors, namely Pentium 4 Extreme Edition 3.20GHz (Gallatin), Intel Pentium 4 3.20C GHz and 3.4C GHz (Northwood) and Intel Pentium 4 3.20E GHz (Prescott). With the help of the outstanding phase-change cooling system from Asetek we will make these CPUs overcome the 4GHz barrier in no time!