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SubjectRe: DRAM to CPU Frequency Ratio (Athlon)
Hi!

> > > The question is what is the ratio between the speed of the CPU
> > > bus and the speed the DRAM should run at. 3:3 means same speed, 4:3 means
> > > the DRAM runs faster than the CPU. If you CPU runs at 100mhz for it's
> > > communication to the chipset and you use '3:3' then your memory also runs
> > > at 100mhz. If you use '4:3' then your memory runs at 133mhz while the
> > > CPU runs at 100mhz. etc, etc.
> >
> > Oke, then I do understand the option. So if I have 133MHz capable
> > memory, the 4:3 ratio _should_ make a noticeable difference. But it
> > doesn't. Now I'm curious why. :-)
> >
> > Thanx for your thoughts!
> >
> > Ookhoi
>
> I am kinda lost on why you expect a difference at all. Kernel compilation
> is mostly crunching data that is in RAM and is limited by cpu speed and
> speed of the cpu<->ram data path. So the speed of that data path has not
> changed (it's still 100mhz).

Isn't it 200MHz with athlon boards? These (K7V) say Host Bus Frequency
is 200MHz. Is that the same bus?

> My guess it that you can see an improvement in 3d stuff that uses agp, as
> the extra bandwidth provided by the ram will be useful. (I.e. when there
> is more than one consumer of the bandwidth).

Aha. Thanx a lot! :-)

Ookhoi

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