The heatsink lifted off easily - I was suprised how light it felt (looks heavier).
First clean the heatsink’s thermal plate as directed but do the CPU swap out as quickly as you can to prevent socket contamination.
Gently reseat the heatsink and repeat in reverse the sequence of the tightening of the screws to a soft hand tighten.
Leave the side cover off and boot up your MacPro - keep an eye out for continual flashing red LED’s on the LHS of the heatsink’ board
- an indication of thermal overload. No LED’s flashing means a successful installation.
Following these instructions I flashed my 2009 Mac Pro 4,1 - 2.66 Quad-core core to 5,1 - then swapped the CPU to a 3.46 6 core.SUCCESS!
Before attempting the CPU replacement read up on static electricity discharge - I simply grounded myself by touching the computer’s metal case several times during the installation with the computer plugged into a socket BUT with the power OFF!
Before removing the heatsink I made a diagram of the screw pattern : 0 (single extreme LHS); 1 (Upper LHS); 2 (Upper RHS); 3(Lower LHS) and
4 (Lower RHS) so I would not forget how many turns and in the correct sequence being 0, 1, 4, 2, 3.
In my case sequence One was 5 turns each, then Sequence Two was around 4 turns.(Nine turns in all per screw.)
The screws have a small ‘give’ when finally undone.