AMD box processors come with a fan, and that grey square is the thermal compound. but when i built my intel system 6 years ago (??) i put about a spot that (if it were a sphere) an 1/8 inch in diameter. 'course the processor was diffferent back then, what kind of processor is it?
only worning - computers dont like waffel runoff. dont put to little or too much, just enough to cover the die.