Re: A7V333 filling 3 Memory Banks

Paul wrote:

> In article <433c62aa$0$49009$14726298@xxxxxxxxxxxxxxx>, "Egil Solberg"
> <egilso@xxxxxxxxxxx> wrote:
>
> > Daniel Mandic wrote:
> >
> > > Really? A KT333 does not accept more than three dimms at 133MHz?
> >
> > I'm reading Paul as if it does not support more than 2 at 166MHz.
> > He didn't mention how many modules are supported at 133MHz.
> >
> > http://www.anandtech.com/mb/showdoc.html?i=1636&p=19
> >
> > There are some boards mentioned here with 4 slots. It could be
> > interesting to download manuals for those boards to see what kind
> > of memory config was allowed.
>
> Interesting. I took a look at the manual for this one:
>
> http://www.shuttle.com/Share/simages/productimages/ak35gt2r.jpg
>
> It has four DIMM slots. Three DIMM slots can be populated with
> double sided DIMMs at DDR333 rates. At that speed, Asus only
> claims to be able to support two double sided DIMMs.
>
> In terms of what the designer can influence, all the boards
> will be using the same Northbridge chip. The designer can
> play with the termination networks for the DIMM busses,
> and the designer can play with the impedance selected for the
> copper tracks that connect the DIMM slots. Perhaps small
> changes there can influence whether the memory bus works
> best when more heavily loaded, or when more lightly loaded.
>
> The rules for DIMM speed versus number of slots are just
> rules of thumb. JEDEC tries to make the behaviors reproducible,
> by specifying that all modules have the same capacitance on
> the lines etc. So at least JEDEC wants to see consistent
> behavior. But not everyone else will see things that way.
>
> There is an option on the KT333 for Command Rate
> 2T. It is actually the default on the A7V333. The board
> will be more stable with three sticks, if it is set to use
> Command Rate 2T for the address bus to the memory.
>
> This article is one of the ones that shaped my opinion of
> how hard this stuff is to get right. This article discusses
> doing DDR333 on just two slots. The file is a 5MB download.
>
> http://download.micron.com/pdf/technotes/TN4607.pdf
>
> Paul

Hi Paul!



All at all, I would not run a 266FSB-DDR AMD with 333 RAM, as this
board can. It is not a KT333A or a KT400!!!
Even a 333FSB-AMD (like a Barton) in this Board :-), I would also run
with 266. Gives an underclocked Barton, but at least synchron. So far I
know, only the RAM may be 333MHz, the Chipset just can 266FSB,
respective 133MHz.

Who cares.....




Best Regards,

Daniel Mandic
.

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