Re: XP memory detection problem at 4 GB

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: Eddie (anonymous_at_discussions.microsoft.com)
Date: 07/22/04 

Date: Wed, 21 Jul 2004 19:17:46 -0700

Hi Bob,

It says 3144948. So it's only showing around 3 GB.

I think this might be related to the memory map. XP only
sees a 4GB memory map, but my bios has a setting DRAM
over 4G Remapping. What this seems to do (based on what
I've seen from running memory diagnostics) is that it
takes the last GB of 4GB of memory to the map above the
4GB boundary. So we have,
----------------------
| 0-3072 | 4096-5120 | equalling 4GB total,
----------------------
instead of,
----------
| 0-4096 |
----------

This is why I only see 3GB in XP with this set (i.e. the
first map section). When I don't have this BIOS setting
enabled one would think that I would get all four GB
before the first boundary, but nope, Windows and the
memory diagnostics see,
----------
| 0-3584 | , so it shows 512MB less than 4GB.
----------

I don't know if this is a mobo issue or what, but for
some reason the full 4GB cannot fit in the first map.
Has anyone else had any experience with 4GB of memory
behaving in this way?

I'd appreciate any help,

Eddie

>-----Original Message-----
>
>"Eddie" <anonymous@discussions.microsoft.com> wrote in
message
>news:19d101c46f70$b4589120$a601280a@phx.gbl...
>> Hi Everyone,
>>
>> I have an Athlon Fx-53 (939) system with 4GB of dual-
>> channel memory filling the memory banks of an Asus A8V
>> motherboard.
>>
>> For some reason XP doesn't seem to detect the full 4GB
of
>> memory installed. In the System Information tool it
>> claims a "Total Physical Memory 2048.00MB"
and "Available
>> Physical Memory of 2.64GB", which is incorrect (not to
>> mention seemingly illogical).
>
>Right click on the task bar at the bottom of your
Windows XP
>screen and click on "Task Manager", then on
the "Performance"
>tab. What does it say for "Total" under "Physical
Memory (K)" ?
>
>-- Bob Day
>http://bobday.vze.com
>
>
>.
>

Relevant Pages