I'm not worried about pressures or much about the temp of the water reaching the CPU. HDD cooler i was looking at has 1/2 fittings which is the size of the water system, so that's not a problem. As far as temp goings, I'm going to try to shove 2 radiators into the case so we'll see. I don't know if you know much about Hydraulics but all pumps create flow not pressure. Restrictions create pressure and pressure is directly related to heat IE if pressure goes up (like 1/4'' fittings) so does heat--hence 1/2'' fittings. That's your lesson for the day lol