backside heatsink and tighten with bolt 8mm.
The process of lapping makes the heatsink base smooth to a near mirror finish, which improves heat conductivity.
Over the last few days I have installed the CPU and heatsink into the motherboard to get it ready for installation.
The SLK-948U perform very well, its the good CPU heatsink for an excellent heat dissipation.
finned heatsink is drilled to enable easy mounting into the equipment case.