>ECC bits required scale as lg2(wordsize protected); for 64
>bits you need 8 extra; ditto for byte parity.  Note, though, that 
>if you are ECCing 64-bit words there are two practical problems:

>1)  32-bit writes require r/m/w cycles, which slows things down a lot.

As it applies specifically to this case of a Triton-2 motherboard: I
have heard, in fact, that they do indeed run noticably slower when
running with ECC enabled.

So, if you don't absolutely *need* ECC, you're probably much better
off with parity, anyway.  At least then you still know when something
breaks down, even if it isn't automagically fixed.

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  Michael L. VanLoon                                 michaelv@HeadCandy.com
        --<  Free your mind and your machine -- NetBSD free un*x  >--
    NetBSD working ports: 386+PC, Mac 68k, Amiga, Atari 68k, HP300, Sun3,
        Sun4/4c/4m, DEC MIPS, DEC Alpha, PC532, VAX, MVME68k, arm32...
    NetBSD ports in progress: PICA, others...

   Roll your own Internet access -- Seattle People's Internet cooperative.
                  If you're in the Seattle area, ask me how.
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