🚀 go-pugleaf

Howdy!

John <faclach@mediaone.net> wrote in message
news:Nvt46.36195$1t.1905477@typhoon.ne.mediaone.net...
> Why is it not desirable to have more than one dimm of PC133?  I am running
2
> (256mb) ????

        Because the extra DIMMs will capacitively load the driver logic,
making "it's squirrely" more likely than with one.

        See, each input to a DRAM chip (be it fast page, EDO, Synchronous,
or whatever) is a capacitor.  Now, when you put capacitors in parallel, they
increase the effective value.  One thing that having capacitance on a
digital line is, is that it causes that nice sharp twitch of the 0-to-1 or
1-to-0 transistion to be softer.

        Think "tube amp sound" for an example of a softening signal.

        Now, if that signal gets TOO far out of spec, you end up with a
delayed transistion, which might cause you to need to go to CAS3 on CAS2
memory, or even cause "glitching" when the SDRAM triggers on noise but not
the proper signal.

        RwP

> "Rod Speed" <rod_speed@yahoo.com> wrote in message
> news:3a525eaf$1@news.iprimus.com.au...

> >
> > Its not as desirable to have more than one dimm with PC133,
> > so you'd be better with a 128MB dimm that works than a pair
> > of 64MB dimms if you can find one that works in that motherboard.