We just built up a couple of these.. The ones we bought were socket 771 (a server board), so NO they wouldn't take regular 775 fans/coolers. Ours DID come with the clips needed to hold the thing down, and provide a stable mount for the sink. These clips were a little weird, in that they were screwed into motherboard stand-offs - but in the end it was an alright design. Its FAR better to have a mount that goes UNDER the motherboard even in 775 socket systems. There is nothing more frustrating than to find that the stupid cooler pins popped back up from a standard Intel cpu cooler. The 775 'push-pin' fan is a totally BAD design, and should have been recalled, imho.
So again, the socket type determines the cooler type, and NO these socket 771 chips won't take socket 775 coolers.