[decodeddiesel]

hmmmm...are we talking a single bong tower to cool both CPUs? For the double tubbing you're gonna need a lot of pump power. Probably a Danner Model 7 at the least. Your idea to balance flow with a valve is a good one, you're gonna want to do this as best you can to ensure balanced temps/flow between the 2 CPUs. I would try to avoid "Y" junctions as best you can as they are murderous on flow rates. Also I wouldn't make your bong too tall as the flow on Danners drops very quickly once you go over about 3 feet of lift. One thing to remember with a bong, air flow is critical!!