4 Gig in new Prec 490 showing as 3 Gig?

[doctormo at gmail.com (Martin Owens)]

Run the program dmidecode and look for the following:

As you can see my machine is limited to 2GB of ram, 1GB per slot.

Memory Controller Information
        Error Detecting Method: None
        Error Correcting Capabilities:
                None
        Supported Interleave: Four-way Interleave
        Current Interleave: Four-way Interleave
        Maximum Memory Module Size: 1024 MB
        Maximum Total Memory Size: 2048 MB
        Supported Speeds:
                70 ns
                60 ns
        Supported Memory Types:
                SIMM
                DIMM
                SDRAM
        Memory Module Voltage: 3.3 V
        Associated Memory Slots: 2
                0x0008
                0x0009
        Enabled Error Correcting Capabilities:
                None

Memory Module Information
        Socket Designation: DIMM0
        Bank Connections: 0 2
        Current Speed: 2 ns
        Type: ECC DIMM
        Installed Size: 512 MB (Double-bank Connection)
        Enabled Size: 512 MB (Double-bank Connection)
        Error Status: OK


On 03/05/07, Jarod Wilson <jarod at wilsonet.com> wrote:
> On Thursday 03 May 2007 15:48:52 Derek Atkins wrote:
> > Jarod Wilson <jarod at wilsonet.com> writes:
> > > iff your kernel is built with PAE support, which in my world, is not the
> > > case for the base kernel. Red Hat's stock i686 kernel is non-PAE, as
> > > there are i686 systems that don't support PAE, and will fail to boot. Red
> > > Hat also ships an i686 kernel-PAE package for those that need PAE. But so
> > > far as I know, PAE is really only relevant/needed if you have *more* than
> > > 4GB of RAM on a 32-bit system. That seems to fall in line with the rest
> > > of Alex's comments below.
> >
> > Yeah, I suppose I could go install the PAE kernel to try it..
> > I know I have 4GB.  But lots of places seem to imply that
> > the chipset max is 3GB.
> >
> > I was hoping that Linux would be able to access it all, but
> > I can't see how to get Linux to see that extra 1GB.
>
> Yeah, some hardware simply isn't built to handle that much memory in an
> efficient manner. I have two different x86_64[1] systems with 4x 1GB stick
> in 'em, both running x86_64 Fedora 7. One can only access right around 3GB no
> matter what, the other can get at the full 4GB.
>
> Note that the 3GB system is a desktop-class AMD64 board with 4 memory slots,
> the 4GB system is a server-class dual socket opteron board with 8 memory
> slots.
>
> [1] so PAE vs. non-PAE doesn't even come into play
>
> --
> Jarod Wilson
> jarod at wilsonet.com
>
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