> 3GB in P4C800-E DeLuxe

  • Thread starter Thread starter Jan Eri
  • Start date Start date
J

Jan Eri

Hi,

I am running with 3 GB in a P4C800-E DeLuxe with the latest BIOS
version, this is recognized as 3072MB when booting

When I install another GB to a total of 4 GB, only 3326 MB is reported
during boot (not 4096 MB as I would expect). The Asus User Guide for
this system says about this situation that the system may detect "...
a little less than 4GB...". With more than 700 MB missing I think it's
more than "a little" missing.....

Has anyone else seen this?

The RAM is 4 pcs of Crucial PC3200, 1GB, CL3, 128Mx64

regards,
Jan
 
"Jan Eri" said:
Hi,

I am running with 3 GB in a P4C800-E DeLuxe with the latest BIOS
version, this is recognized as 3072MB when booting

When I install another GB to a total of 4 GB, only 3326 MB is reported
during boot (not 4096 MB as I would expect). The Asus User Guide for
this system says about this situation that the system may detect "...
a little less than 4GB...". With more than 700 MB missing I think it's
more than "a little" missing.....

Has anyone else seen this?

The RAM is 4 pcs of Crucial PC3200, 1GB, CL3, 128Mx64

regards,
Jan
Click to expand...

The PCI bus address space and I think the AGP aperture, come
from the missing zone. Some chipsets have a remapping capability
(generally this is on server boards), so you can have what appears
to be a contiguous space. On the 875/865, you are stuck with the
hole. Try cranking down the AGP aperture ?

For official docs, try downloading the 875P Northbridge datasheet
from the Intel site. I tried to follow the info on the memory map,
but I guess my brain isn't up to Intel standards :-)

http://developer.intel.com/design/chipsets/datashts/index.htm?iid=PCG+devleftnav&
http://developer.intel.com/design/chipsets/datashts/252525.htm

HTH,
Paul
 
Jan,

As Paul details, this is a somewhat frequently mentioned issue.

Could you follow up on Paul's suggestion to review your AGP aperture
setting? If you had say a high spec 3d card with say 128MB or more of video
ram, things you could try - that may not work too well - would be to reduce
the AGP aperture to the least value or trying a minimum spec 2d card (EG an
8 or 16 mb card), disabling all unused controllers and so on.

My theory here is that doing so might remove memory range reservations that
the Intel chipset places on memory. If you wish to see those, you can go
into Control Panel, System, Hardware, Device Manager, then on the View menu,
select View Resources by Type. This does not telly too well though. On my
system for example it indicates the PCI Bus has over 3GB of memory
allocated..... So obviously there is a more to it than meets the eye.

There may be no change at all - but if you could post back your experience,
we would appreciate it.

- Tim
 
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