Messages in this thread | | | Date | Fri, 4 Aug 2000 16:46:58 +0200 | From | Ookhoi <> | Subject | Re: DRAM to CPU Frequency Ratio (Athlon) |
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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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