was the 3rd thermalright cooler i had but the worst:-
1) rubber fan mountings weren't long enough. no big deal but sloppy,
2) the noctua can mount 2 fans in a push/pull configuration. The cost of adding a extra set of rubbers & wires would be peanuts but would add a lot more.
3) In every review i read it out performed the zalman 9500
yet when i fitted the ultra was running 3200 at 65C on load
see Zalman v Ultra