"benson.gs" <guest@unknown-email.com> wrote in message
news:4f0c07c29ac2bfaa14ffb0e64274224f@nntp-gateway.com...[color=blue]
>
> I just recently added a 2GB 1066MHz DDR3 PC8500 memory to my laptop
> which now has a total physical memory of 4GB. Checked if the Vista
> recognized the added RAM and the System info shows 4GB. Likewise, the
> Memory diagnostic tool reported "No errors found" in the 2 x 2GB memory
> modules. However, the task manager reports total physical memory is only
> 2516 MB and cache is reported at 1173 MB. Can somebody in the forum
> enlighten user of what's going on? Does this indicate that only 2.5GB is
> "used" by Vista? Where is the 1.5GB RAM?
>
>
> --
> benson.gs[/color]

Upper 768MB (0.75GB) of memory is reserved for add on peripherals. That's
leaves 3.25GB for program and OS use.

It's hard to tell where the rest of the memory went without the make/model
of your laptop.

Your laptop maybe using a video chip that uses main memory as video memory
and has carved itself some 800MB chunk of memory from your pool of 3.25GB.
You might be able to reduce that in the BIOS, but without knowing what the
make and model is I couldn't give you a definite answer.