I've debated doing something like that until I learned it isn't all it's cracked up to be. A guy's CPU was overheating even with a cooled current (flowing) submersion setup. I can't remember all the specifics why he was having that issue, but pinpoint or traditional liquid cooling is a proven effective way to cool computer hardware. Submersion has only been done by one manufacturing company combined with traditional liquid cooling, yet the specs show it's really not a dramatic difference in performance. A good liquid cooling setup with a high cfm equal intake and exhaust chassis/system fans will result in a high stable overclock. 4.5+ GHz is feasible with the right setup. Any higher you're going need Liquid Nitrogen or Helium. You might as well get two Xeon CPUs if you want more processing power. Thermal Paste can make a big difference too. It was proven by Benchmark when they tested 80 different pastes... etc... Overall a custom cooling system should be well thought out before jumping into the nitty gritty.