Archived from groups: alt.comp.hardware.overclocking.amd (
More info?)
"Whoever" <nobody@devnull.none> wrote in message
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ine.LNX.4.61.0501041231030.17659@localhost.localdomain...
> Wes,
>
>
> On Tue, 4 Jan 2005, Wes Newell wrote:
>
>> On Tue, 04 Jan 2005 01:33:10 +0000, Whoever wrote:
>>
>>> Q: Will the XP processors run at lower FSB speeds than the rating?
>>>
>> They're rated for a FSB of 50MHz, but should run at a lower speed. I
>> haven't found a MB that will even get down to 50MHz though much less
>> lower. What I think you meant to ask was if they'd run at a lower speed
>> than the default and the answer is most definately yes. They'll also run
>> at much higher speeds.
>
>>
>>> Explanation: I have a MB with 200MHz FSB and possibly a spare Athlon-XP
>>> 1800 (266 MHz FSB)
>>>
>> Nope the 1800+ uses a default FSB speed of 133MHz, not 266MHz. It's
>> called
>> a 266FSB for marketing BS. See The Real Front Side Bus in link in sig
>> line. Most MB's that say they support a 200MHz FSB probably refers to the
>> real speed of 200MHz. That would be 400FSB.
>
>
> Yes, you are correct. I was using the marketing numbers. So I have an
> XP-1800 which has a DDR interface at 133MHz (marketing rating = 266MHz
> FSB) and I want to know if it will work in a MB which only supports a FSB
> at 100MHz/DDR (marketing rating 200MHz). According to your website, it
> should, but the processor will run a little slow (more like a 1400+:
> 1800/1.33 = 1353).
>
> I also want to know if I am limited to using the XP 2600+ processor in the
> board that currently has the XP-1800+ and has the 133/DDR interface
> (marketing FSB rating = 266MHz), or if I can actually use a faster
> processor -- even if it does not run faster. For an explanation of the
> question, look at the prices of the 2600+/266 processors -- they seem to
> have rarity value pricing!
>
> Again, your website seems to read that again, this is possible, but the
> processor will run slow, because the maximum multiplier is locked within
> the CPU -- if I understand it correctly, a 2800+ processor (for example)
> would run like a 2200+ processor (2800*133/166 = 2243)
>
> Am I correct in my calculations?
>
> >
>>
>> This Duron only uses a 100MHz FSB. Now if you mean your other board
>> supports a 200FSB (100MHz) then the 1800+ will not reach it's default
>> speed without raising the multiplier from 11.5 to 15 or 16.
>
> This would actually be quite a nice option for me -- the computer runs
> 100% of the time, so an underclocked XP might run cooler and hence be more
> reliable than a duron at full speed (while still being a more powerful
> processor).
>
a 2800 processor will only run at 2 ghz or there about, a 2600 will run at
1.9 a 3200 will run at 2.2, all AMD top end processors run at 2.2 ghz, even
..3400, that is apart from FX processors some of which hit 2.4ghz and 2.6ghz
but the mere model name AMD XP Athlon 2600+ doesnt mean its a 2.6 ghz
processor, its just the model number, the way you calculate the speed of a
processor is go to the BIOS
find the FSB
for my 2600+ the fsb should be 166MHz
then the multiplier, which i believe i have at 11.5 or maybe 12
anyhow if you take the multiplier
11.5 and multiply it by the FSB 166
11.5*166=1909 thats the processor speed in MHz
so say you have an FSB of 100 MHz and a multiplier of 10 then the speed
would be of cource 1000 MHz or 1GHz
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