With two ultras and the 64 that's a lot of heat to get rid of. You are going to need either one monster rad or go with a two stage setup. Even with the monster rad, the second ultra is going to be running real hot as you will likely be dumping 50C water onto it from the first one. So your options are to have two seperate loops or put a second rad in between the video cards.
As for sizes, go with 1/2" all the way (port, pump, tubing, rad, res) you will need all the flow you can get.
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