Acer 9520 ram 3 gb usable

[wgiuntini]

Hello,
windows 7 64 bit installed, 4Gb of phisical ram (I've just upgraded it from 2 to 4Gb), but the OS report 4Gb and 3 usable. My video card take 1 Gb (there are already 512Mb build in)

 

[buwish]

What kind of memory did you put in it, i.e. brand-specs?

 

[wgiuntini]

Crucial RAM
Module Size: 4GB kit (2GBx2)
Package: 200-pin SODIMM
Feature: DDR2 PC2-6400
Specs: DDR2 PC2-6400 • CL=6 • Unbuffered • NON-ECC • DDR2-800 • 1.8V • 256Meg x 64

They define this memory as "Memory Upgrade for the Acer Aspire 9520 Laptop/Notebook"