XP recognizes 750 MB instead of 3 GB of RAM on Acer Aspire Laptops

Hello!,

I use two Acer Aspire Notebook:
1 - A5920G
2 - A6920G

Both work in multiboot, with Windows Vista, XP and Ubuntu.

Vista is installed in the 2nd primary partition of 30 GB (the first primary is inaccessible because code 27, for Recovery use).
Windows XP SP3 is installed in the 3rd primary partition of 20 GB.
Ubuntu is installed in extended, and the Data partitions also, as logical partitions.

The laptops have each of one 3 GB of RAM (native original), 1x2 GB + 1x1 GB.

Vista recognizes and uses 3 GB of RAM, in both laptops.
Ubuntu recognizes and uses 3 GB of RAM, in both laptops.

XP otherwise recognizes and uses only 768 MB (512 MB + 256 MB), in both laptops.
The drivers for XP were downloaded from ACER Support Web site, properly for the specified laptops.

When I boot the laptops by HBCD 11.0, Windows XP SP3 in virtual mode recognizes 3 GB of RAM.

How can I force the installed Windows XP to recognize the whole RAM of 3 GB?

Regards.

 

Welcome to HWF

If your system has more than 2 GB of RAM installed, it will only work on a 64-bit operating system. XP is 32-bit, so that means it comes up with weird values. Linux and Windows Vista can recognize more than 2 GB using a 32-bit version, but it won't be able to actually use it.