NEC Express5800/120Rh-2 N8100-1126F - Manual (Page 300)

9-26 Upgrading Your Server
10. Push the CPU lightly to the socket, and push down the lever to secure the CPU.
11. Put the heat sink on CPU.
NOTE: Be aware of direction of heat sink (see figure below).
12. Fix the heat sink clips with four screws.
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