RyNemesis: On this my point was: if desired overclock couldn't be reached with extra 5C temps with gpus on same loop, i wouldn't use said overclock at all, as that in my eyes is not reliable/stable enough, with similarly loosing stability on eg. simple situation of raising ambient temps by same ammount.
P.S.
Ivy Bridge is not THAT hot .. once you replace it's flawed TIM1 beneath IHS.