Well, this...
...shows it fitting on a P55 board so you should be good. If it is rotated so it pushes air towards the back of your case like most setups the fan may block the first and second memory slots but just install the fan after unless you are using a kit with a tall heatspreader (Muskin Frostbyte, G.Skill Ripjaw, OCZ Reaper etc).
The main problem that I find with clearance no longer seem to come from the boards but the chassis they are installed in. Too many manufacturers don't leave enough room between the top edge of the motherboard and the top of their case, especially if they have a top exhaust fan so that may be something to think about as well.
I wish that more manufacturers would post measurements of the heatsinks such as bottom of the contact base to the bottom of the first cooling fin so those with extra high cooling solutions on their northbridge chipsets and VRM's along with higher than normal heatspreaders on their memory could check to see if it would fit.
On an unrelated note this would look amazing on a Foxconn Flaming Katana.