4 Extreme Edition 3.4 GHz

This is it. The fastest processor for Socket 478. It is the Pentium 4 Extreme Edition 3.4 GHz. This is quite a sought after processor, even to this day commanding a premium. It will require decent cooling so watch out for that, otherwise it can throttle and slow down during benchmarks.

Performance is great and if you're looking to build the ultimate Socket 478 machine, this processor is a must.