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Date: Mon, 22 Nov 2010 00:05:52 +0100
From: Jiri Slaby <jirislaby@gmail.com>
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To: Andreas Hartmann <andihartmann@01019freenet.de>
CC: linux-kernel@vger.kernel.org
Subject: Re: missing 700 MB of RAM
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On 11/21/2010 08:02 PM, Andreas Hartmann wrote:
> I've got 8 GB RAM installed, but linux reports 7,3 GB. Where is the
> missing RAM (700 MB)?
...
> The motherboard is a GA-MA78GM-S2H (64bit, AMD) with a on board Radeon
> HD 3200 VGA card. The card uses 256 MB of RAM - so 444 MB of RAM are
> missing. Where are they gone?

Hi, ask your BIOS:

> BIOS-provided physical RAM map:
> BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
> BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
> BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
> BIOS-e820: 0000000000100000 - 00000000afde0000 (usable)
> BIOS-e820: 00000000afde0000 - 00000000afde3000 (ACPI NVS)
> BIOS-e820: 00000000afde3000 - 00000000afdf0000 (ACPI data)
> BIOS-e820: 00000000afdf0000 - 00000000afe00000 (reserved)
> BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
> BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
> BIOS-e820: 0000000100000000 - 0000000230000000 (usable)

It reports 7677M of usable mem. Or maybe your loader is cheating on you?
I doubt so...

regards,
-- 
js