Intel SHG2 - Manual (Page 47)

Upgrading 47
5. Lift the socket lever on the processor socket labeled CPU1. (If adding a second processor, lift
the socket lever on the processor socket labeled CPU2.)
6. Align the pins of the processor with the socket, and insert the processor into the socket. Lower
the socket lever completely.
✏
NOTE
When installing a second processor, note that the secondary processor socket
is oriented so that the processor pins are rotated 180° relative to the primary
processor socket.
OM14365
A
B
C. Alignment Triangle Mark
D. Alignment Triangle Cutout
Figure 28. Opening Socket Lever and Attaching Processor