Subject: Re: Physical memory tests?
To: Michael L. VanLoon -- HeadCandy.com <michaelv@HeadCandy.com>
From: Bill Sommerfeld <firstname.lastname@example.org>
Date: 08/04/1996 10:38:41
> >Besides, at 64 bits wide, ECC memory doesn't require any more bits
> >than parity....
> Are you sure? I was under the impression that it required one or two
> extra bits. But, I'm no expert on the subject... I just know ECC
> SIMMs are a lot more expensive than "normal" SIMMs.
I'm pretty sure the HP "snake" systems use 72-bit wide memory storing
64 bits data + 8 bits ECC ..
I suspect you need more than 4 bits to ECC-protect 32 bit words, but
as the ECC word size increases, the number of additional bits you need
per bit decreases.