Dell 810 Owner's Manual page 106

Figure 3-11. Installing and Removing a Memory Module
1 memory module
3 alignment key
8 Align the memory module's edge connector with the alignment key of the
memory module socket, and insert the memory module in the socket.
NOTE:
install the memory module in the socket in only one way.
9 Press down on the memory module with your thumbs to lock the memory
module into the socket.
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.
10 Repeat step 6 through step 9 of this procedure to install the remaining
memory modules. See Table 3-2 and Table 3-3.
11 Slide the front-chassis assembly into the chassis. See "Front-Chassis
Assembly" on page 98.
12 If applicable, install the front bezel. See "Installing the Front Bezel" on
page 83.
106
Installing System Components
3
The memory module socket has an alignment key that allows you to
1
2 memory module socket ejectors (2)
2