ok, fired her up again.. HSs just resting by weight along, no Cu bracket.. I held the 140mm in place with my hand.. temps were virtually dead even on all 4 cores (~34C).. then WCG kicked in. temps on both CPUs were even & ranged betwee 39-45C.. thats good enough - close enough to what u were getting D_A .. ok so... must be uneven bracket mounting pressure