Archived from groups: alt.comp.hardware.overclocking (
More info?)
bigdaddy wrote:
> Well since no one else will give you a straight forward answer I will,
> the reason it is not showing in windows as 2800+ is because the BIOS
> does not see it as a 2800+ All windows knows is the information given
> to the OS from the BIOS, not like you can uninstall a processor. NOW
> that being said let me tell you why you BIOS does not see it as a
> 2800+. It knows it isn?t. Let me give you an example I have a 2500+
> Barton Over clocked to 3200+ My BIOS at post shows a 3200+ because I
> changed the front side bus to 400 MHz (from 333 where the 2500+ runs)
> Now because 2500+ and 3200+ both use the same multiplier "11.0" It
> cannot tell the difference. 11.0 at 333Mhz(166x2) is 1826Mhz or 1.8Ghz
> (11x166=1826) so do the math for the 3200+ 11.0 at 400(200x2) is
> 2200Mhz or 2.2Ghz (11x200=2200) if you understand that you can plainly
> see that your BIOS cant see a 2800+ just because of the speed because
> the Multiplier is not correct for a 2800+ but Is correct for a 2600,
> so it makes the best guess that you have Over clocked your 2600+ and
> guess what, Its right. Because I have changed mine to 400MHz front
> side bus the setting are Perfect for a 3200+ it has no choice but to
> see multiplier of 11 and freq. of 2.2Ghz, Must be a 3200+ so to sum it
> up the Multiplier is NOT right for a 2800+ so its not going to see it
> no mater what speed you set it to. You might research the multipliers
> of other chips, since the 2800+ is a larger Multiplier , if not
> locked, you can use the 2800+ multiplier with the 2800+ front side
> setting, 333Mhz(166x2) and it will see that it is a 2800+. As to the
> CPU ID string stuff most BIOS's let you turn Processor ID ON or OFF. I
> hope this clears some of this stuff up. Oh and windows sees my
> processor as a 3200+ as well as Sissoft sandra (shows # 3200).
>
That may very well be how that motherboard works but not all do. Most, if
not all, of mine report the actual speed, or the corresponding model rating
at that speed, regardless of whether the multiplier or FSB is 'right for
that model' or not.
For example, my K7S5A reports an overclocked 1800+ as a 2000+ and neither
the FSB nor the multiplier are what a 2000+ processor would be (neither is
the actual speed, but it's 'close').
My BP6 reports the overclocked Celerons as Celeron 450 even though there is
no such animal, as a 'standard' processor anyway.
My P2B-VM with a 1.1 gig tualatin overclocked to 1.36 gig is just
bumbfoozled, however, and reports it as something cockeyed like 423 MHz,
probably because it doesn't understand the reported multiplier.