I'm building a case from scratch and this is the cooling loop that I came up with. Note that the side with the pair of 5870's is the max heat load that I'd likely put on that side. I left out the pumps and reservoirs to simplify the illustration. Yes, it's a dual system case. Basically I want to use something like a Koolance plate heat exchanger to dump the heat from the P4 system (server) to the main loop right before it hits the radiator.
If this isn't practical, I'll just use a motherboard tray with a 120mm fan port and use a single 120 radiator. I figure the temps wouldn't be too bad if I have to use my backup plan because I'm using a 2x 120 radiator with a single fan (damaged the first fan, too lazy to replace) and temps aren't too bad.
*OR*
Would it be more practical to just add the P4 to the loop?
http://i86.photobucket.com/albums/k9...g?t=1285159402