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iwill ka266r (at bus clock question)

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Dec 31, 2000
what is this?? the manual says at bus in terms of a fraction of the cpu clock speed, the default is 2/4 but i can select clk 2/5 or 2/6- what does this do and would one of the other settings give me a better overclock? I have a 133/266 athlon at a multiplier of 138x120=1563
the next fsb setting is 126 and I was unable to get it to do that extra fsb jump from 120 to 126