Intel Vig390s - Manual (Page 43)

Vig390s Motherboard Manual V1.0 42
Figure 20: CPU sockets
If one CPU is to be installed it should be installed in socket for CPU1 as shown
above. Lift the socket arm up as shown for both sockets in figure 21 install CPU
noting correct orientation.
Figure 21: CPU fitted in ZIF socket
Now repeat for second CPU if required; and lock both CPU sockets with each socket
locking arm.