This does not offer better performance but its under 700g (less than half of most high end HSF) & much smaller so case temps should improve slightly as less airflow obstruction mine keeps a Core i7-980x pretty cool & silent. You cannot really get much more performance out of air HSF than the U12 unless you turn to liquid cooling.
http://www.overclockers.co.uk/showproduct.php?prodid=HS-021-NC&groupid=701&catid=2330&subcat=2346
It's a nice little cooler.thanks for the replies, it does look like the PH-TC12DX would be a good upgrade.
EDIT : Hey Helios, do you have plans for testing a PH-TC12DX? Looks promising, and I like your reviews. Slightly better than the new Vapor-X cooler, which would be another interesting test.
copy and paste fail, I meant the PH-TC14PE sorry, the PH-TC12DX looks almost identical to the noctua i am already using. My ram is fairly low profile (normal ram height with plain heatsinks, no bits sticking out the top of them) and my case is fairly big, so anything should fit really.