Supermicro X11SRi-IF User Manual page 27

5. Use your thumb and index finger to hold the CPU by its edges. Align the CPU keys,
which are semi-circle cutouts, against the socket keys.
6. Once they are aligned, carefully lower the CPU straight down into the socket. To avoid
damaging the CPU or socket, do not drop the CPU onto the socket, move it horizontally
or vertically, or rub it against the socket pins. Note that you can only install the CPU
inside the socket in one direction.
7. With the CPU inside the socket, inspect the four corners of the CPU to make sure that it
is properly installed.
Socket Keys
27
Chapter 2: Installation
CPU Keys