more RAM + faster disk -> slower box?!

Sam Smith S at
Thu Nov 29 18:32:17 GMT 2001

On Thu, 29 Nov 2001, Paul Richards wrote:
> >> be a  public ceremony for Manchester BSDers in the Lass O' Gowrie where
> >> I will eat  my BSD horns and tail, date and time to be announced. :-)
> >
> > You're a gentleman, a man of your word, and you're going to get
> > indigestion.
> >
> > Apparently (thanks Sam) I need "registered DIMMs" (whatever they are) in
> > order for the board to cache more than 512MB. Our so-called engineers
> > knew nothing about this; I got the usual shrugs from them when I asked
> > about it. I mean,  I know I always get poor quality hardware, I just
> > didn't expect it to be  quite this bad...
> That makes no sense at all. Registered DIMMs have a register in them to
> help with bus loading i.e. you can stick a lot more RAM into a box that
> uses registered memory, it has no bearing on cacheability at all.

But if the Motherboard will only take 512Mb of non-registered memory,
and you put 756 in?

> Did I miss Sam's email somewhere?

It appears I only mailed Ian for some reason.

My mail consisted of a reference to: (the
relevant chipset AFAICT)

and the words
" Note that the DRAM controller will only talk to 512 unless you
have "registered DIMMs"  "


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