Re: PII vs PIII

From: kony (spam_at_spam.com)
Date: 10/11/03 

Date: Sat, 11 Oct 2003 08:54:59 GMT

On Fri, 10 Oct 2003 18:31:51 +0000 (UTC),
glhansen@steel.ucs.indiana.edu (Gregory L. Hansen) wrote:

>>The fact that the top speed for this board is 600MHz leads me to think
>>that it will only work with the "Katmai" flavour of P-III not with its
>>successor the "coppermine". The Coppermine was the one where they
>>halved the amount of L2 cache on the basis that they made it full
>>speed at the same time. These chips require a lower core voltage than
>>the Katmai ones and some motherboards don't have voltage regulators
>>that are capable of supplying the correct one. So, if it says top
>>speed is 600MHz they probably mean that you're limited to the older,
>>512KB cache, P-III's.
>
>I didn't realize there was such a difference between a PIII 600MHz 512K
>cache and a PIII 600MHz 256K cache. Are all PIIIs with 512K Katmais, and
>all PIIIs with 256K coppermines?

Regarding the previous paragraph this is in reply to, you could check
the motherboard manual or spec sheet if available, or take the numbers
off the voltage regulator controller chip, head to the respective
manufacturer's website, check the datasheet for the voltage levels it
supports. For an extra level of certainty you could take a continuity
meter and check the corresponding VID pins on that regulator with the
VID pins in the socket (with CPU removed), as per the socket pin
functions seen on Intel's CPU data sheet for the CPU. Hmm, I just
remembered, it's a slot one board... same procedure but checking
continuity at the slot contact instead of a socket pin.

Then there's the BIOS support... see if there's a setting in the BIOS
for "Halt on CPU error" or similar. If so, disable it. You may need
to update the bios, and in rare cases (some Intel boards) you don't ev

>
>When I asked about the VRM, I was told the part number 0950-2837 was for
>any PII/PIII up to 600MHz, and they specifically said it's not for
>"coppermine". I've asked if the machine would support a faster PIII if a
>different VRM were installed, but haven't gotten an answer yet, and I'm
>beginning to wonder if I will. I think the motherboard has the 440BX
>chipset, if that makes a difference, but I know it also matters which
>motherboard the chipset is sitting on. And maybe a BIOS upgrade, which HP
>may or may not have, and which I've never done.
>
>The more I learn about this, the more it all gets complicated by little
>bits of information like what you've just said above.

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