front side bus
<hardware> (FSB) The bus via which a processor communicates with its RAM
and chipset; one half of the Dual Independent Bus, the other half being the
backside bus. The L2 cache is usually on the FSB, unless it is on the same chip
as the processor [example?].
In PCI systems, the PCI bus runs at half the FSB speed.
Intel's Pentium 60 processor used a bus speed and processor speed of 60 MHz. All
later processors have used multipliers to increase the internal clock speed
while maintaining the same external clock speed, e.g. the Pentium 90 used a 1.5x
multiplier. Modern Socket 370 motherboards support multipliers from 4.5x to
8.0x, and FSB speeds from 50 MHz to a proposed 83 MHz standard. These higher
speeds may cause problems with some PCI hardware.
Altering the FSB speed and the multiplier ratio are the two main ways of
Toms Hardware - The Bus Speed Guide.
Toms Hardware - The Overclocking Guide.
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