I've got the zotac 8200, and installed an Arctic Cooling Low profile heatsink and it seemed like it was gonna bend a little too. (Keep in mind, this is an am2+ board)
AM2+ chips have to have a backplate, and the hs came with its own that seemed similar to the one that came with the motherboard, but it was more flexible. This backplate bent for sure when I screwed the heatsink on. I think this kept me from actually bending the motherboard.
So if intel socket chips use backplates, make sure you use the one that came with your cpu cooler if it did.