Lenovo X200 - Manual (Page 102)

Table 12. Removal steps of dimm (continued)
For ThinkPad X201 Tablet:
When installing: Insert the notched end of the DIMM into the socket. Press the
DIMM firmly, and pivot it until it snaps into the place. Make sure that it is
firmly fixed in the slot and does not move easily.
94 ThinkPad X200 Tablet and X201 Tablet Hardware Maintenance Manual