Edna Sloan wrote:

> I have an LX chipset Soyo MB with bus speeds of 66,68,75 and 83.  CPU is
> celeron 300a which runs fine in a BH6 board @ 100 b us.  In the lx board it
> will only run properly at 68 bus.  At 75 it will boot up and run ok except
> for graphic programs, like PhotoDeluxe, etc, or internet pages, and will
> lock up.  I also have an ISA sb16, and PCI lightstpeed 128 video, udma 33
> Quantum HD,and scsi 2930 card for a scanner.  I am guessing that its the
> video card that's the problem.  I have tried different bios settings -
> slower memory, cache, pio, and video settings with no change.  I have
> checked the OC sites and forums but don't find anything about PCI devices
> that will run at 75 or 83 bus.

That's right, the problem is the PCI card, keep this in mind, when you
overclock, the PCI device will run at higher than 33Mhz, in case of 75, the PCI
runs at 75/2=37.5, 83 will run at 83/2=41.5mhz, far over PCI bus spec. Not all
PCI cards can run at those high speed.
Modern chipset (running at 100mhz or higher) can properly divide bus speed by 3
or 4 (100 doing 100/3=33, 133 doing 133/4=33), however, BX and LX don't do
that, they only divide by 2, so be careful on overclock issue.
Abit mobo has great overclock capability, you can set PCI speed to force it
runs at 100/3=33 not 100/2=50. that's why you have no problem with BH6 mobo.

Jun Qian

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