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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
front side bus
FSB
(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 ran the bus and processor at 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 overclocking processors.
{Toms Hardware - The Bus Speed Guide
(http://www.tomshardware.com/reviews/bus-speed-guide,49.html)}.
{Toms Hardware - The Overclocking Guide
(http://www.tomshardware.com/reviews/overclocking-guide,15.html)}.
(2002-02-21)