[HARDWARE] Degeating the PII Clock Lock

Phillip Chambers pj.technology at virgin.net
Sun Nov 1 00:24:26 EST 1998

The trouble I've found with odd PCI bus speeds has been with SCSI
controllers, which don't like it at all, but as you said I've never has any
problems with any other type of card...
I found with my Avansys PCI Ultra SCSI-2 would boot at 75MHz bus, but not
function correctly, and at 83.3 it wouldn't even detect the controller chip!


-----Original Message-----
From: Juan Valdez <jbudde at one.net>
To: hardware at lists.distributed.net <hardware at lists.distributed.net>
Date: 31 October 1998 19:36
Subject: Re: [HARDWARE] Degeating the PII Clock Lock

> The PCI bus runs at half the main bus speed when it's at 66, 75,
> or 83.  At 100, 103, and 133 it runs at 1/3 bus.
> Most times if the PCI bus runs much higher than 33MHz, you'll run
> into props with your adapter cards.

Yes, I have seen that posted on sites, like tomshardware, but
I've never had any problem with my devices running a 75 or 83mhz
bus. I've tried 3 different video cards (one which used PCI 1.02), 2
sound cards, 2 differents modems, never had a problem. Maybe I've
just been lucky though. (Hercules Stingray 128, S3 Trio 64V+,
some digital board with a S3 Vision864 chip on it, 56K Winmodem,
USR, 33.6 Zoom V.34I+, SB16 (CT2890 on the SB site for the
specs), Asound Gold).

>The The 350MHz PII uses 100MHz bus too. The 300 and 333 are
>supposed to use 66MHz, but can be coaxed to use 100MHz with >the right
board and RAM.

That's why I said
"the 350 Mhz PII [not including that], Intel used a 66mhz bus on
their chips. The 350+ use a 100mhz bus. [including the 350]"

And as far as PC66 SDRAM, I don't know--never used it. But it
makes sense that it'd work at 100mhz since I've seen PC100 go up
to 133mhz bus. All I know is that straight EDO SIMMs won't run
any faster than 66mhz.

>Which board are you talking about, I recommended the P2B-D
>which is a dual BX board.

Of course, if you want to overclock a dual PII-333 system by
raising the bus (which seems to be the easiest way, esp. with the
newer chips being multiplier-locked at 5.0), you'll need the BX

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