front side bus

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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 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 overclocking processors.

Toms Hardware - The Bus Speed Guide.

Toms Hardware - The Overclocking Guide.
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16GHz black MacBook features a 667MHz front-side bus, 1GB of 667MHz DDR2 SDRAM, 160GB SATA hard drive at 5400rpm, a DVD+R DL/DVDRW/CD-RW optical drive and Intel Graphics Media Accelerator 950, with a suggested retail price of USD1,499.
0 GHz 13" black MacBook is available for a suggested retail price of GBP999 (inc VAT) with 667 MHz front-side bus, 1GB of 667 MHz DDR2 SDRAM, expandable to 2GB, and a 120GB Serial ATA hard drive (5400 rpm).
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