SIIG Transport GX21 B5350 - Manual (Page 19)

2.2 Installing motherboard components
Chapter 2: Setting up 13
4. Lift the CPU locking lever as shown below.
5. Place the CPU in the CPU socket, ensuring that pin 1 is
located as shown in the following illustration.
6. Press the CPU locking lever back down to secure the
CPU in the socket.
7. Repeat steps three to six for the second CPU.
8. Apply thermal grease to the top of the CPUs and place
the CPU heatsinks on the CPUs.
pin 1