4G Memory Only Recognised 3.4G

[Jayson Rowe]

Soo-Hyun,
The only reliable way would be to download the x86_64 version and 
re-install you system.

I do not believe you could succesfully "upgrade" to 64-bit via apt.

On Tue, 18 Dec 2007, Soo-Hyun Choi wrote:

> My system has Intel Dual Core (E2140) processor and my Ubuntu installation
is 32-bit copy. I now understood why my 4GB memory cannot be fully used in a
32-bit system. Then, how can I change my system to 64-bit system?

Many thanks,
Soo-Hyun


On Dec 18, 2007 1:09 AM, John DeCarlo <johndecarlo at gmail.com> wrote:

> On Dec 17, 2007 7:26 PM, Soo-Hyun Choi <s.choi at hackers.org.uk> wrote:
>
> > Recently, I have installed 4 x 1GB memory sticks with Ubuntu 7.10, but
> > my system only sees it as 3.4GB. Is this a typical phenomenon? Or, how
> > can I fix this problem?
> >
>
> The first reply had it about right.  A 32 bit system can only address 4
> GB.  When you have less than 4 GB memory, the system can map your BIOS and
> video memory and other items to unused addresses.  When you have 4 GB, you
> see that the result of this mapping means you can't use all your RAM.
>
> You could try using a 64 bit version of Ubuntu, then you will see all your
> RAM.
>
> --
> John DeCarlo, My Views Are My Own
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