clock speed multipliers

Wig

I'm a bit confused here.

This says

"All processors work with two operation frequencies, an internal frequency and an external one. They get their internal operation frequency multiplying their external clock by a multiplication factor. For instance, the Athlon XP 2400+, which works internally at 2,000 MHz (the value indicated by the Athlon XP processors is not their real clock), gets this clock multiplying their 133 MHz external clock by 15 (133 MHz x 15 = 2,000 MHz)."

And this says
The same chip has a bus speed (FSB) of 266MHz and a multiplier of 15

That is also the info given on wiki for the athlon XP 2400

And this says The "external clock" is 266MHz

I have that chip installed and my FSB is set to 266MHz

So How does it get to an internal 2000MHz using an FSB/external clock of 266MHz and a multiplier of 15? I suppose the answer lies in the fact that 133 is half of 266 and they used the 133 figure in the example calculation, they just omitted to say why they used 133 when all the data says the external speed is 266Mhz.

Also, given my FSB is 266MHz (or is it 133MHz?) what would be the best RAM to use?
133MHz DDR266,
166MHz DDR333 or
200MHz DDR400?

spud17

To get you totally confused, possibly me also.

It's all to do with Double Data Rate, note, I'm only a beginner at this.

http://en.wikipedia.org/wiki/Double_data_rate

GunJack

run CPU-z and it'll show you exactly what's running at what speed...soz, don't have a linky handy

Wig

So where my motherboard manual says FSB 200MHz, 266MHz, 333MHz & 400MHz

They actually should have written 100MHz, 133MHz, 166MHz and 200MHz respectively and/or written it as 200MT/s, 266MT/s 333MT/s & 400 MT/s

Thanks

Wig

GunJack wrote: »

run CPU-z and it'll show you exactly what's running at what speed...soz, don't have a linky handy

Prolly don't work with Win98 I was actually looking for one earlier tonight that would work with Win98.

spud17

This says it works with all versions..


http://www.filehippo.com/download_cpuz/tech/


This says Win 9X

http://www.filehippo.com/download_cpuz/tech/844/


I *think* that's correct in post #4, as I said I'm only a beginner, wait 'til Ritchie gets here, he'll sort us out.

Slurps cider. :beer:

Wig

Yeah, I'll give it a go.


Nope. Says it expects a newer version of windows........

OK, so I went to the authors webpage and downloaded the WIN98 version fingers crossed.....

Yipee It works!!

AMD Athlon XP thoroughbred
2000MHZ
Bus Speed 133MHz
FSB Rated 266 MHz

So maybe FSB is not the same as Bus Speed?
'Bus speed' must logically = 'External clock'

spud17

OK, so I went to the authors webpage and downloaded the WIN98 version fingers crossed.....

Probably the same as I added to my post.

gonzo127

am i the only person who is thinking 'my god how is someone is still using windows 98'?

Richie-from-the-Boro

gonzo127 wrote: »

am i the only person who is thinking 'my god how is someone is still using windows 98'?

No you're not the only person, include me also. I'm feeling guilty because I read spud17's cider enabled post lass night, where he said in in #6 .. .. .. wait 'til Ritchie gets here. I'm feeling guilty because I was here .. .. .. but didn't jump in to help.

I thought about it for less than a millisecond and was driven mad by pictures in my mind of the core speed / multiplier / bus speed / rated FSB / do I raise the FSB or clock / what will it do to the PCi or AGP / will the memory ratio change / then there is double & quad pumped / then 1/4 and 1/5th dividers for boards with no AGP lock / memory / overheating etc.

So I broke out the Carling and watched a movie instead :beer:

PS Sorry spud17 you have one on me too M8 :beer:

gonzo127

Richie-from-the-Boro wrote: »

No you're not the only person, include me also. I'm feeling guilty because I read spud17's cider enabled post lass night, where he said in in #6 .. .. .. wait 'til Ritchie gets here. I'm feeling guilty because I was here .. .. .. but didn't jump in to help.

I thought about it for less than a millisecond and was driven mad by pictures in my mind of the core speed / multiplier / bus speed / rated FSB / do I raise the FSB or clock / what will it do to the PCi or AGP / will the memory ratio change / then there is double & quad pumped / then 1/4 and 1/5th dividers for boards with no AGP lock / memory / overheating etc.

So I broke out the Carling and watched a movie instead :beer:

PS Sorry spud17 you have one on me too M8 :beer:

haha my brain just homed in on windows 98 with the thoughts of omfg and didnt even think about overclocking the system,

although thinking about it now i might have the break out my 'spare' system and see how much i can get out of that old beauty (sempron 3000+ which i think is stock clock at 1.8ghz with 1gb of DDR400 ram) hhmmm wonder if i can break 2.5ghz, a quick google shows people getting them to 2.4,

hm starting to get the itch, must resist as the Mrs might actually kill me in my sleep if i spend the entire bank holiday weekend overclocking a old system that isnt likely to be used, short of the total destruction of my main system