What is your current setup? There is no way you should be seeing 71C on watercooling; something isn't right.
what are you talking about ?,71C @5.0Ghz 1.44V is normalhttp://www.overclock.net/intel-cpus/914262-official-sandy-bridge-5ghz-club.html
@humanage...." Oh, and to show temps further, I hit 71c on load 5GHz @ 1.43v."..what do you expect >???
if you don't like the temps ,you can increase your RAD face,get better TIM,reseat your CPU
EDIT;you have to bleed your system properly,T-line is PITA,flip the exhaust fan ..make it intake,your pump is twisted ,you may be getting air packets in it...,etc