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Date:      Sat, 05 Jul 1997 19:12:38 -0700
From:      Ludwig Pummer <>
To:        Michael Alwan <>, Shawn Ramsey <>
Cc:        Don Wilde <>, Carey Nairn <>, questions@FreeBSD.ORG
Subject:   Re: EDO vs non-parity RAM
Message-ID:  <>
In-Reply-To: <>
References:  <>

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At 09:05 PM 7/5/97 -0400, Michael Alwan wrote:
>Shawn Ramsey wrote:
>> Also, if you board doesnt support parity RAM, and is an Intel chipset, it
>> won't cache more than 64MB of RAM! The only decent Intel chipset really is
>> the HX chipset. (Supports ECC and 512MB of cachable RAM)
>Enlighten me: how does a motherboard "cache" RAM?  My Biostar 8500TUC
>has the HX chipset, but according to the manual, *supports* just 128MB
>of RAM, and can only *cache* 64MB of RAM.  (Obviously the motherboard
>must itself be constucted to take advantage of the chipset.)  Is there
>any point in putting more than 64MB on the motherboard?  Will more than
>64MB of data just swap out to virtual memory, even if I have more than
>64MB of RAM?

The motherboard must support 128MB, and a "tag SRAM" chip must be put on
the motherboard to allow it to cache more than 64MB of RAM. And I don't
know what cacheing the RAM does, except that it _does_ increase system

I learned all this from Tom's Hardware Guide (

--Ludwig Pummer
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