Acer Altos G710 - Manual (Page 76)

3 System upgrade 66
Note: The DIMM slot is slotted to ensure proper installation.
If you insert a DIMM but it does not fit easily into the socket, you
may have inserted it incorrectly. Reverse the orientation of the
DIMM and insert it again.
6 Observe the post-installation instructions described on page 40.
Reconfiguring the system memory
The system automatically detects the amount of memory installed.
Run the BIOS setup to view the new value for total system memory and
make a note of it.