Dell POWEREDGE C6105 - Manual (Page 136)

136 | Installing System Components
5 Align the memory module's edge connector with the alignment key of
the memory module socket, and insert the memory module in the
socket. See Figure 3-31.
NOTE: The memory module socket has an alignment key that allows you to install
the memory module in the socket in only one way.
Figure 3-31. Installing and Removing a DIMM
1 memory module 2 memory module socket
3 memory module socket ejector (2)
6 Press down on the memory module with your thumbs to lock the
memory module into the socket. See Figure 3-31.
When the memory module is properly seated in the socket, the ejectors
on the memory module socket align with the ejectors on the other
sockets that have memory modules installed.
7 Repeat step 4 through step 7 of this procedure to install the remaining
memory modules in the approved configurations. See Table 3-2.
8 Replace the system-board assembly. See "Installing a System-Board
Assembly" on page 93.