What's the black edge behind the mobo at your cpu?
Is it rubber trim for a hole in your mobo mounting panel?
I'm about to nibble a hole in mine. So sick of pulling the mobo to swop cooling back plates.
Had any hassles with the two black heat blocks near your cpu? I found they didn't make good contact on the middle of each row. Had to bend them in a tad and regrease them. Got rid of piles of that gunk gap filling TIM they used.