So, i have a Intel i5 6400 2,7 ghz, which has a 1151 socket, and i bought a be quiet! pure rock slim cpu cooler with a 92mm fan, which is supposed to fit on the sockets 1150, 1151, 1155, and 1156. So i have a match. But the damn thing just won't fit. It got those Intel push pin things, but if i place the heatsink evenly on the CPU, it doesn't sit properly and wiggles around, none of the pins are in as deep as they should be. If i really push one in as deep as they should be, and fasten it, the other 3 pins basically hang in the air and the entire thing no longer properly touches the CPU. I fastened 2 of them diagonally across, which required a lot of pressure, and the entire fucking main board just bent in the middle, so i loosened them again. I have no idea why this thing won't sit properly.