Acer Altos R720 Series - Manual (Page 90)

3 System upgrade 80
Caution! Use extreme care when removing DIMMs. Too much
pressure can damage the connector. Apply only enough pressure
on the plastic levers to release the DIMM.
1 Observe the ESD precautions and pre-installation instructions
described on page 35.
2 Press the holding clips on both sides of the DIMM slot outward to
release the DIMM (A).
3 Gently pull the DIMM upward to remove it from the DIMM slot
(B).
4 Observe the post-installation instructions described on page 36.
To reconfigure 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.