Brian Rerecich (rerecich@segosf.hlo.dec.com)
Wed, 21 Apr 1999 15:32:41 -0400
I don't want this to turn into a war, but Eric here is right.... Chris is
wrong.
ECC = x72
non-ECC = x64
ECC only has one bit per 8 data bits. I should know since I design the
stinkin' chipsets!!!! :)
Any, enjoy your new board.
-Brian
Chris Price wrote:
>
> Eric Dittman wrote:
> >
> > > 1) These motherboards do NOT use ECC memory, correct? The documentation
> > > for the motherboard certainly implies this.
> >
> > I tried a pair of non-ECC PC-100 memory on mine and they didn't
> > work. I installed a pair of ECC PC-100 memory and they worked.
> > The manual listed memory configurations consisting of x72 memory,
> > which is ECC.
>
> Incorrect;
>
> Standard dimms are 64 bits wide. Parity memory has one extra parity bit
> for every 8 data bits, so 64/8= 8, and 64+8 =72bits, so therefore 72bit
> dimms are PARITY, not ECC.
>
> ECC memory has *4* parity bits for every 8 data bits, so 64/8,
> 8x4parity bits=32 parity bits, and 64+32, so therefore ECC should be
> 96bit memory.
>
> > Non-ECC DIMMs are x64.
>
> Correct.
>
> Chris
>
> --
> __________________________________________________________________________
> Pournelle's Law:
> If you do not know what you are doing, deal with people who do.
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-- =========================================================== Brian Rerecich SHR3-1 Pole U18 Hardware Engineer Alpha Core Logic Group Compaq Computer Corporation rerecich@segosf.hlo.dec.com 334 South Street Phone: (508)841-2400 Shrewsbury, MA 01545 DTN: 237-2400 ===========================================================-- To unsubscribe: send e-mail to axp-list-request@redhat.com with 'unsubscribe' as the subject. Do not send it to axp-list@redhat.com
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