Sony PCV-RX791 - Manual (Page 48)

VAIO Digital Studio System Reference Manual 36
4 Push down the handle on each side of the memory module to eject
the module from its socket.
5
Grasp one edge of the memory module and lift out. Store the module
in a static-free bag.
!
Touch any exposed metal part of the chassis to discharge static
electricity in your body before handling the memory module.
!
All empty sockets must be filled with either RIMM or CRIMM modules in
pairs.