EK Vardar fans are recommended for radiators. They consume only 1.44 watts of electric power:
https://www.ekwb.com/shop/ek-vardar-f3-120-1850rpm2x480 radiators would be able to handle 6 HD7970s, even with overclocking.
Pumps require about 10-20W. One 20W pump is enough to power the loop with two radiators and 6 HD7970s.
All in all, watercooling is much more power-efficient than aircooling, especially for multi-GPU rigs. Only obstacle is the high initial cost of watercooling equipment.
Wow, a huge "Thanks" from me, for you :) I am really thankful for your help. Ofcourse I want to thank the other helperful people too. :)
13 years of watercooling experience here. Feel free to ask anything you want.
Uhm... I don't know if this sounds stupid but... do 2 240 radiators are as good as one 480 radiator? I could two 240 radiator for less than one 480. Also I can't find that many 480 radiators :/
2x240 should be as good as 1x480, provided they are of same fin density (and same fans used).