Zalman had a great idea, but missed - Keeping a lot of water cooling way outside the computer is a Good Idea(tm) but to really do it right - 1 - add an inexpensive 120-mm-fan size radiator to the line running between the Z tank to the heat sinks and stick the radiator/fan out of a window (OK, on the sill between screen and glass) for fall through spring- move to the top of an ac for summer, and youll cool a near-150- running P-4 hothead into a 2-digit cool-ruunner- Add a short hose to the tank inlet so newly arrived water goesw to the top and not right out the pump's suckhole and you'll shave 10 degrees off the output eater before it hits the radiator, meaning you'll keep runni ng cool as your AC cycles on and off all summer long.
Corse you can do it cheaper buying all but specialtystuff at an aquarium/pool place and building your own 2-4L external tank, maybe cut total I spent from $350 w/therm. to $200 w/superpump-just as quiet and guaranteed. key is cooling and keeping a lot of water *outside* your hot box