my report:
ordered the mugen 2 and thought "well... 1400 rpm are not enough", so i ordered an extra
ultra kaze with 3000 rpm. well, i didn't realize that the ultra kaze is much thicker than 25mm.
right when i got the two things i tried to mount the ultra kaze on the mugen 2.. -.- ofc it didn't work. i just had to be a little bit resourceful, so i used
cable tie to mount the ultra kaze 3000 on the mugen 2 - fits perfectly.
my board:
evga 680i: mugen 2 is mounted facing the rams with the longer side, but the ultra kaze blocks two of my ram slots. i can use them and even change the rams underneath it, but they shouldn't be dominators or similiar

also the mugen 2 touches the nforce chipset cooler and somehow causes a short circuit on the board, so i had to put a piece of plastic between both cooler - it now works perfectly.
my tower:
coolermaster centurion 5: fits perfectly in the tower without touching the psu.
ve got the ultra kaze running with 3000 rpm and it's f*cking loud and i love it
now ive got 4x 120mm and 1x 80mm fans in my centurion 5 plus 2x wd raptor plus 2x wd/seagate 7200u/min plus a msi geforce nx8800 ultra, so u can imagine what noise the computer does

))
ps: e6850 @ 3,8 ghz @ 1,5 vcore @ 40° idle @ 60° load
4 gb kit black dragon series cl4 ddr2-800 @ 1066 mhz @ 5-5-5-15 @ 2,175 volt
and i'm sorry for my bad english