Hot. You're putting it all on one loop though? What kinda radiator setup do you have?
Loop 1: CPU, NB
Loop 2: 5970-1, 5970-2
Dual DDC pumps w/ XSPC res tops. One of the best performing pump setups at the time that I bought them about 4 months ago. Dual Swiftech 240 radiators, on on each loop.