Many people seem to be having problems getting these sunbeam units installed on the gigabyte ultra durable series. I own an ep45-ud3r and was able to mount a 120mm unit without modifications. I haven't tried it but i'd imagine that people are having exactly the same problems with the 92mm unit, given that the retention bracket/system is identical.
I don't own one, but it seems as though the layout of the ud3p series is exactly the same and users are encountering the same problem, specifically, that there is zero clearance, at least not enough to fasten the metal fastener to the plastic retaining bracket after it's mounted.
Again, you can mount these monsters without modifying the motherboard and without being a gymnast. In a standard configuration, at least with the 120mm, the heatsink will be oriented with the fan at the bottom, blowing upward towards the power supply (when looking at it from the side).
Basically, it's just impossible to get the metal retaining clip to hook to the plastic mount because the heatsink labeled "ultra durable" on my ep54-ud3r gets in the way. I actually mounted the plastic retaining bracket WITH the heatsink assembly attached on the side that faces the "ultra durable", meaning, that the metal retaining clip was "hooked" on that side, seated this side of the bracket facing the "ultra durable" (the fact that there is so little clearance actually helps to keep the retaining clip seated on this side) , pushed the retaining pins in (Very tight quarters. Needle nose pliers or tweezers help!), then seated the other side of the retaining bracket and installed the pins. Now, with the both sides of the bracket fastened and the pins in and, hopefully, having put some heat sink grease on the chip (you have to install the chip and fasten it down first because you can't move the retention lever after the plastic retaining bracket for the ccf is installed) it's time to fasten the metal clip to the other side to the retaining bracket--the final step. Tilt the entire assembly (grab it around the top and use the beast as leverage) toward the other side and attach that clip. Don't fret about this because the tension is really on the clip, NOT on your motherboard. Once you tilt it, it'll snap on easily. This is actually a fairly common mounting system.
You don't need any special tools to mount this assembly and if you do it exactly the way I have stated, it's actually a snap to install.
I have pictures of the beast in place and can give further instructions if needed. email
tom2131@gmail.com
I've the transparent side panel Cm690.. thinking of goin with a tunnel like config with the top front fan blowing air in, no top rear fan, the ccf blowing air to the rear and rear fan blowing air out.. 
Any better config's? :S
