Acer Extensa 2900D - Manual (Page 57)

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Key component upgrades
Your computer is designed to deliver solid performance. However, in
time, you might find that your applications demand even more
computing power. For this reason, you are able to upgrade key
components.
Note: Contact your authorized dealer if you decide to perform a
key component upgrade.
Memory upgrade
Memory is expandable to 2 GB, employing 128/256/512/1024-MB
industry standard Small Outline Dual Inline Memory Modules
(soDIMMs ). The computer supports Double Data Rate (DDR) SDRAM.
There are two memory slots on your computer, one of which is occu-
pied by standard memory. You can upgrade memory by installing a
memory module into the one available slot, or replacing the standard
memory with a higher-capacity memory module.
Installing memory:
1 Turn off the computer. Make sure that the AC adapter is
disconnected, and then remove the battery pack.
2 Turn the computer over to access the memory compartment on
the bottom of the unit. Remove all screws (a) from the memory
compartment door, and then lift the door off (b).