PolarFLO CPU block: This is a bad performer.
http://www.overclockers.com/articles373/wbsum.asp Don't worry about NB cooling, as it offers nothing in either stability or overclock. The Innovatek reservoir (if it's the one I think it is) doesn't have a divider, so there will be lots of turbulence at the outlet, and it has little channels that will only be 3/8" or 1/4". 11*5.5 is plenty of room for a big heater core... Heater cores own the BIX so much it's a little amusing.