TYAN TS75-B7122 Service Engineer's Manual page 39

6. To secure the heatsink assembly, use a T30 Security Torx to tighten the
screws in a sequential order (1234).
NOTE: When disassembling the heatsink, loosen the screws in reverse order
(4321).
7. Repeat the procedures described earlier to install the second processor and
heatsink.
39
http://www.tyan.com