The stock intel heatsink that came with my boxed Q6600, when installed, actually bends my Gigabyte EP45-DS3R. I had to RMA my first of these boards because of component failure, and now I'm suspecting that my replacement board may be under undue duress, as well. It's less than a centimeter of bow, but there are some light cracking noises when the thing goes on. I usually buy OEM CPUs and aftermarket heatsinks, and this is my first exposure to this particular heatsink, so I have no idea if this kind of thing is normal. I imagine a mobo can take only so much flexing. It's a little nerve-wracking. Piyono