A humble Pentium III system

Reply 40 of 44, by PCBONEZ

Posted on 2015-12-03, 22:07

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As I understand it what holds Katmai back is that the off-die cache chips can't keep up at higher speeds.
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I don't have one to verify this but I read somewhere that the Pentium III 450 with sSpec SL35D was blessed with the same cache chips as used on the 600MHz Katmai and because of that it will run at 600MHz just fine.
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Reply 41 of 44, by PcBytes

Posted on 2015-12-04, 05:22

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gerwin wrote:
PcBytes wrote:
133 gave me 560MHz.

You must have set it to 112 MHz FSB there.

112MHz FSB gave me 500MHz. Seriously,POST reported it as 500MHz on 112MHz FSB.

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Reply 42 of 44, by Tetrium

Posted on 2015-12-04, 08:59

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PcBytes wrote:

112MHz FSB gave me 500MHz. Seriously,POST reported it as 500MHz on 112MHz FSB.

I've seen several times before strange CPU speeds being reported during POST by some motherboards, even if it was an underclock. I see it especially when using a chip that isn't recognized by the BIOS because the BIOS build date predates the CPU that it fails to correctly identify. So it might not even be the correct CPU frequency.

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Reply 43 of 44, by TELVM

Posted on 2015-12-04, 11:11

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PCBONEZ wrote:
... I read somewhere that the Pentium III 450 with sSpec SL35D was blessed with the same cache chips as used on the 600MHz Katmai and because of that it will run at 600MHz just fine.

Yep:

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Reply 44 of 44, by gerwin

Posted on 2015-12-04, 13:36

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Tetrium wrote:
PcBytes wrote:

112MHz FSB gave me 500MHz. Seriously,POST reported it as 500MHz on 112MHz FSB.

I've seen several times before strange CPU speeds being reported during POST by some motherboards, even if it was an underclock. I see it especially when using a chip that isn't recognized by the BIOS because the BIOS build date predates the CPU that it fails to correctly identify. So it might not even be the correct CPU frequency.

Yes, It is much more likely that the measurements are off, or human error, then that there is suddenly a Retail Pentium III with an inconsistent multiplier.

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