[HARDWARE] Degeating the PII Clock Lock

Travis Stone djoir at powernetonline.com
Mon Nov 2 16:03:38 EST 1998


-----Original Message-----
From: Phillip Chambers <pj.technology at virgin.net>
To: hardware at lists.distributed.net <hardware at lists.distributed.net>
Date: Saturday, October 31, 1998 5:34 PM
Subject: Re: [HARDWARE] Degeating the PII Clock Lock


>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!
>
>Phil
>
>-----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
>chipset



In regards to all of this.

I happen to have a very bad Trident Video card that makes me have my clock
speed for my 200 mhz Cyrix set down to 133. Someday I might have enough
money to junk the thing and get a pII. Or Else I'll just buy a Diamond Viper
V550.


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