Date: Wed, 23 Feb 2005 12:02:29 -0700 From: Scott Long <scottl@samsco.org> To: "O. Hartmann" <ohartman@mail.uni-mainz.de> Cc: freebsd-amd64@freebsd.org Subject: Re: More than 4 GBytes RAM on Socket939 system? Message-ID: <421CD345.2060305@samsco.org> In-Reply-To: <421CC86E.2050509@mail.uni-mainz.de> References: <421C4B1B.5070102@mail.uni-mainz.de> <20050223180142.GB26395@dragon.nuxi.com> <421CC86E.2050509@mail.uni-mainz.de>
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O. Hartmann wrote: > David O'Brien schrieb: > >> On Wed, Feb 23, 2005 at 10:21:31AM +0100, O. Hartmann wrote: >> >> >>> Will it be possible to address more than 4GBytes of RAM with the above >>> mentioned board (nVidia nForce4-SLI chipset)? >>> >> >> >> Yes. If you can install >4GB RAM, the CPU+motherboard will use it. >> >> >> >>> The limitations are settled in the chip core, I think. >>> >> >> >> No the limitation is with the CPU, which has 40 physical address lines. >> So you use 2^40 bytes of RAM. >> >> >> >>> AMD64 processores only address 4 memory slots and can not address >>> 128MBit memory chips, >>> >> >> >> What is a 128 MBit chip? >> >> > > Dear David. > I found this info on ASUS homepage for the A8N-SLI and it means (I think) > a single IC, 128MBit x 8 organized. > > Thanks for this really good news! I guess you're implying that the memory controller on the 939 only has enough address decode and refresh logic to drive DRAM chips of a certain maximum size? David, can you comment? Scott
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