That kind of cooling basically removes the cpu as the bottleneck in your system. If you have chosen components that can handle being run at higher than spec, you might be able to get a 50% overclock with extreme cooling.

It really isn't financially viable - it's cheaper to build a dual-cpu system, or get a second computer than to supercool a single one. Like any hobby, there are those of us who want to see how far they can go....for the challenge and bragging rights.

Me, I want to have an Athlon cpu running in excess of 2 ghz, with my current equipment (not waiting for a 2ghz cpu to be released).