Asus RS300-E7/RS4 - Manual (Page 22)

Chapter 2: Hardware setup 2-4
The CPU fits in only one correct
orientation. DO NOT force the
CPU into the socket to prevent
bending the connectors on the
socket and damaging the CPU!
Gold
triangle
mark
Alignment keys
CPU notches
5. Position the CPU over the socket,
ensuring that the gold triangle is on
the bottom-left corner of the socket,
and then fit the socket alignment
keys into the CPU notches.
3. Lift the load lever in the direction
of the arrow until the load plate is
completely lifted.
Load plate
4. Remove the PnP cap from the CPU
socket by lifting the tab only.
PnP cap
Cap tab