I have a Gigabyte P55-UD4 with an Intel i5 750, Socket LGA1156, the boxed cooler was kinda noisy, when idling the cores were at ~40°C and when rendering stuff in 3DsMax my CPU temp went up to ~70°C
So I got myself a Mugen 2 Rev. B...
It works fine, my cores are down to ~30°C in idle, ~45°C when rendering, but mounting it on the mainboard was kinda hard.
Here's some pictures:
I had no one to help me out, so I had to prop up the board like this, held one of the fxing cups with a pair of tweezers and turned the corresponding screw with a screwdriver, while pushing down on the board itself with my chin, so it wouldn't move >_>
As you can see above, the passive cooling units on the board make it hard to reach the cups with your fingers, and you have to insert your RAM before installing the cooler. There is still room between the fan and the RAM, but not much. (I put the fan on that side, so it would blow the air out of the back, where it's supported by a case fan)
And this is the worst part, that plate on the back of the board is larger than the opening in the backplate.
I carefully removed a little of the insulation washer (not all of it, there's still some of it between the plates) and had to gently press down on the cooler, so I could get the screws through the assembly clip far enough to get them in the fixing cups.
Not fun, but it works.
EDIT:
Um... Yeah, I just noticed that the backplate has a notch, so I simply had to turn it around and wouldn't have had such a problem with it.
Don't know why I didn't notice that when installing the cooler
Well, I feel like an idiot now, but it works and I honestly don't want to take my comp apart again just to turn the backplate around...