There was an article on either toms/anandtech...but have to go back to work now, so cant look for, but VTT/QPI voltage scales not only on uncore mhz, but also on amount of ram, as more ram places more demands on mem controller...in addition to diffs in chips, matters a lot whether using 3x1, 3x2 or 12 gb of ram. I am using 3x1 since still on xp 32bit, which is why once I am at 1.30-1.32 VTT, using 18x uncore, raising it more does nothing for me. Those with 6 and 12gb probably on average, benefit more...we need a big chart somewhere of everybodies details and overclocks would be interesting to learn from...and no I am not offering to do it.