Azhar Ali Chohan wrote:
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Michael Karas, I have seen new latest PCs with programmable system clock and bus speed for example, 66Mhz, 100Mhz or 133MHz bus speed, through BIOS setup without changing hardware.

I'm pretty vague on all this but I think the 'bus' referred to here is the Front Side Bus (FSB) which is the bus between the CPU and memory. I don't think it is related to the PCI bus speed.