🚀 go-pugleaf

Guy Barwood - Dilithium Computing <dilithium@dilithium.com.au> wrote in
message news:Z3F46.4916$l02.10938@news1.sunsh1.vic.optushome.com.au...

> Your statements are essentially correct however it is not the
> number of DIMMs that is the real limit, it is the number of banks.

Its more complicated than that. As far as being able to run the
ram at the best specs, its actually the number of ram chips per
data line that also affects what timing params can be used.

I just said that its not as desirable to use the pair of 64MB dimms
instead of a 128MB dimm, because the single dimm gives more future.

> There is no advantage (other than keeping DIMM sockets
> empty) in using 1x128Mb double sided DIMM (which has
> two banks) as 2x 64Mb single sided DIMMs (which have
> one bank each), they both consume 2 banks.

Its more complicated than that too. Not all
chipsets have a limit on the number of banks.

> An example is the Intel D815EEA motherboard.  It can only support
> 4 banks at 133MHz (board has 3 DIMM sockets), so you can use up
> to 384Mb (board max) at full 133MHz only if you use single 3x128Mb
> sided DIMMs, use double sided 128Mb DIMMs and you can only have
> up to 256Mb at 133MHz, any more an the RAM speed drops to 100MHz.

And that last is just more detail on what I was talking about.

> Also, you have not thought of the option that the board
> is faulty at 133MHz but functioning properly at lower
> speed (the board is not clearly working properly)

You dont know what I thought.

Its less than clear just what he means by his finger trouble.

> and the cheap RAM is actually 100MHz therefore the cheap RAM
> appears to work (while it is actually nor working as advertised) and
> the expensive RAM is functioning correctly and the motherboard is
> failing at 133MHz.  As unlikely as this may be it is real possibility.

And in practice it turns out to not be the problem. Yes, there were
obviously some more obscure possibilitys, I dont always choose to
attempt to list every single obscure possibility. My choice.

> We do not have enough info to say for certain that the Kingmax RAM is faulty.

Duh.


> Rod Speed <rod_speed@yahoo.com> wrote
>> John <faclach@mediaone.net> wrote

>>> Why is it not desirable to have more than one dimm of PC133?

> > Basically with unbuffered dimms, the load is effectively
> > the number of ram chips per data line. As the number
> > increases, due to the number of dimms, you start to
> > have a problem with being able to run it at 133Mhz.
> >
> > I didnt mean to imply that 2 isnt viable, just that its better to have
> > a single 128MB dimm in that system than 2*64MB dimms, just because
> > that gives more future, being able to add another 128MB dimm later etc.
> >
> > > I am running 2 (256mb) ????
> >
> > Thats fine. Some systems cant run 3 PC133 dimms at 133MHz reliably tho.
> >
> >
> > > Rod Speed <rod_speed@yahoo.com> wrote
> > >> Barry Ward <baz@powerup.com.au> wrote
> >
> > > > > I recently put together an AOPEN AX3S based system where
> > > > > I bought all the parts from a dealer in Brisbane. I also bought
> > > > > from him  a stick of 128 Meg of Pc133 (Kingmax) memory.
> > > >
> > > > > The memory stick would not work - so I bought a cheaper
> > > > > 64 meg stick from another dealer and this worked fine.
> > > >
> > > > > Took the 128 meg stick back to the original dealer and got it
> > > > > replaced with 2x64 meg sticks ---  BUT these will not work either.
> > > > > No matter whether I use them singly or in any combination
> > > > > ---only the 64 meg stick from the second dealer will work.
> > > >
> > > > > Now, am I missing something here -is it possible
> > > > > that 3 sticks from this dealer can be bad??
> > > >
> > > > More like not bad, just not doing PC133
> > > > properly if you are running them at 133MHz.
> > > >
> > > > Just force the original dealer to give your money back.
> > > > He legally has to do that when they clearly wont work
> > > > in that motherboard which obviously isnt defective when
> > > > the 64MB dimm from the other supplier works fine.
> > > >
> > > > 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.