That mutli-processor setup is complete BS.. You are taking one 1/2" tubing and splitting it in half.. so effectively only giving each side say.. 50GPH of water.. The true facts is that only so much water will go into the tubing/block at a time.. it's around 100GPH on waterblocks.. like the Danger Den Maze2.. BUT on the Swiftech there i no internal tubing.. so it might be higher flow rate .. Anyway.. You aren't putting enough water down that tube to fill both blocks with good pressure.. that setup is insane.. I wouldn't run it.. I would run seperate tubing to each CPU through 2 different pumps/reseviors. I might run them into the same radiator though.. Say if I had a 3/4" tubing radiator or even 1" .. Anyway just my worthless 2cents.