SetsulTry deliding. The Ivy Bridge/Haswell TIM is pretty bad.
Delliding = Grab a hammer and a vice, remove the IHS (that metal thing above the processor itself) and replace the shitty intel thermal paste.
Sounds a lot more dangerous than it really is.
Without the thermal issues 4.5-4.8 should be possible, depending on your processor.
It's less that the TIM is bad (some guys have done controlled testing for gap height and found the TIM is actually decent quality) and more that the gap between the IHS and the die is too big by default. The process of de-lidding effectively reduces the gap when remounting the IHS. It's been shown that this is the big difference maker in reducing temperatures, rather than the replacement of the TIM itself.
Either way it'd be nice if they improved the gap issue to improve the thermal transfer.