I've got all weekend lol but just by looking at the surface area of the IFX and the fact I can get two fans, front and middle it has to be the more efficient.
(rear fan will have to be the case 120mm exhaust as I can't fit a third one on the cooler and retain the exhaust fan)
Trouble is they both use different back plates
meaning I have to haul the board out twice (this is where Zalmans universal mount wins imo) but you never know, I've had the cpu up to 3.6GHz since I got home (Zalman) so it looks like I'm in for a big weekend.
I'll fire up my lappie to report back here and start stripping the desktop I suppose