It turns out the cpu is NOT overlapped. The Tuniq's FAN is hitting the motherboard's chipset cooler. There is about a millimeter difference, that's what's causing the scraping sound. I have figured out how the solve this problem...by placing a washer at the top of the Tuniq at each of the four screws to raise the fan higher. Sorry for jumping to conclusions but that was my first thought--the CPU because I lapped it.