Re: Hardware Problem - Asus A8N-VM CSM

[Marc Perkel <marc@perkel.com>]

Bill Davidsen wrote:
> Marc Perkel wrote:
> > Langsdorf, Mark wrote:
> > > > > The problem. 2 out of the 4 sees all 4 gigs of ram. The other 2 
> > > > > see only 2.8 gigs of ram. And it's hardware related because in the 
> > > > > bios setup the ones that show 2.8 show it in the bios.
> > > > >
> > > > > The motherboards were not prchased at the same time. All have 
> > > > > different brands of ram. And the processors are different. The 2 
> > > > > that don't see all the ram are the newest ones.
> > > > >
> > > > > I tried swapping ram between one that saw 2.8 gigs and one that 
> > > > > saw 4 gigs and the problem stays with the motherboard.
> > > > > I haven't yet swapped out the processors.
> > > > >
> > > > > So - I'm a little stumped. Can someone point me in the right 
> > > > > direction?
> > > > >       
> > >
> > > Usually, missing memory comes from the PCI I/O hole, or the
> > > IOMMU/AGP/framebuffer overlays.  Does your BIOS have an
> > > options for creating a memory hole or hoisting memory?  If
> > > so, are the settings between the 4G machines different from
> > > the 2.8G machines?
> > >
> > > Also, do you have an IOMMU aperture enabled and if so, how
> > > large?
> > >
> > > Are there any hardware differences between the systems, like
> > > different AGP or PCI graphics cards?
> > >
> > >  
> > > > Answering my own question perhaps. Could it be related to whether 
> > > > or not the processor is a "revision e" chip?
> > > >     
> > >
> > > Possibly, but I'd expect the RevE parts to see more DRAM than
> > > the earlier parts.
> > >
> > >
> > >   
> >
> > I fixed the problem. It wasn't a Revision E issue after all. I just 
> > pulled the battery and when it came up clean it saw all the memory. 
> > Thanks for your help.
> Would have been interesting to use the "reset to factory defaults" 
> option, just to see if some bit isn't set to known state doing that.

Actually that's what it tuened out to be. It had nothing to do with 
Revision E.
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