By the way, how much does liquid cooling help? Is it considerably cooler than AS5 and a good hsf?
Not in my experience with the bigwater
But the bigwater has 1/4" tubing, much smaller than the standard 3/8" or even more commonly used for serious setups, 1/2" tubing. Couple that with a mediocre radiator and a medium quality copper block and you have....a medium resulting WC setup
My temps would hit 45C full load with the bigwater, whereas with the SLK-900A and an 80mm Vantec tornado they haven't gone above 38-39C.
Another purpose of water cooling is the fact that it's a lot more quiet than this tornado and a case load of fans.
Also, yes, a high quality water cooling setup will most definitely give you better temperatures than any air cooling could possibly offer. Mind you we still would put AS5 on the CPU regardless of air or water...I think once you hit phase change you can forget about thermal paste