Date: Thu, 31 Mar 2005 10:47:33 -0800 From: "David O'Brien" <obrien@FreeBSD.org> To: "Greg 'groggy' Lehey" <grog@FreeBSD.org> Cc: FreeBSD-amd64@FreeBSD.org Subject: Re: Problems with AMD64 and 8 GB RAM? Message-ID: <20050331184733.GC1687@dragon.NUXI.org> In-Reply-To: <20050330224445.GW84137@wantadilla.lemis.com> References: <20050330222439.GU84137@wantadilla.lemis.com> <20050330223546.GA4705@troutmask.apl.washington.edu> <20050330224445.GW84137@wantadilla.lemis.com>
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On Thu, Mar 31, 2005 at 08:14:45AM +0930, Greg 'groggy' Lehey wrote: > > I had 4 bad out of 12 tested where the DIMMs were Crucial PC2700 2GB > > Reg. ECC DIMMs. > > OK, this makes sense. It might also explain why the 4 GB > configuration only recognizes 3.5 GB. No. This is due to the 3.5-4.0GB PA address range that the PeeCee architecture reserves for the PCI config space, AGP GART, memory mapped I/O, etc... Many Opteron BIOS's don't bother to hoist the "covered" memory above 4GB. Please see the freebsd-amd64 archives -- this has been discussed many times. -- -- David (obrien@FreeBSD.org)
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