Toshiba Magnia 550d - Manual (Page 73)

Connecting Hardware Devices
CPU module
56
4 Release the lock lever of the CPU slot for the additional CPU
module.
Release the lock lever
5 Align the pins of the additional CPU module with the holes in
the CPU socket, and gently press the CPU module into the
socket so that all the pins are inserted into the holes.
Inserting a CPU module
NOTE: The standard CPU module is installed in the CPU
socket at the lower left side. Install an additional CPU module
into the vacant CPU socket located at the upper right side.