front side bus

(redirected from Front-side bus)
Also found in: Acronyms, Wikipedia.

front side bus

(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.
Mentioned in ?
References in periodicals archive ?
16GHz white MacBook features a 667MHz front-side bus, 1GB of 667MHz DDR2 SDRAM, 120GB SATA hard drive at 5400rpm, DVD+R DL/DVDRW/CD-RW optical drive, Intel Graphics Media Accelerator 950 and Gigabit Ethernet port, with a USD1,299 suggested retail price.
0 GHz PowerPC G5 processors, each with an independent 1 GHz front-side bus, for an astounding 16 GBps of bandwidth.
Single- and Dual-Core AMD Opteron processors deliver exceptional performance and performance-per-watt to the market because they are built on AMD64 technology with Direct Connect Architecture, innovated to reduce bottlenecks inherent in traditional front-side bus architectures and enable a more efficient approach to computing.
0 GHz 13" white MacBook is available for a suggested retail price of GBP879 (inc VAT) with 667 MHz front-side bus, 1GB of 667 MHz DDR2 SDRAM, expandable to 2GB, and an 80GB Serial ATA hard drive (5400 rpm).
The AMD Athlon XP processor is compatible with AMD's Socket A infrastructure, and supports the advanced 266MHz front-side bus.
The HP NetServer LC 2000, which incorporates up to two Intel Pentium III 733MHz processors with a 133MHz front-side bus, offers high expansion capacity, with memory expandable up to 4Gb and I/O and internal storage expendable up to 144Gb.
RapidIO has found a home interconnecting DSPs, HyperTransport has become the front-side bus and processor-to-processor interface for all AMD processors, and PCI Express is the new standard for board-level peripheral interconnects in all computing applications.
Employing an innovative design, the AMD Duron processor features a sophisticated cache architecture with 192KB of total on-chip cache, a high-speed 200MHz front-side bus, and a super scalar floating point unit with 3DNow
The Dell Precision 420, the company's fastest ever workstation, incorporating single or dual Intel Pentium III processors at either 733 or 600 MHz and Intel's 840 chipset with 133MHz front-side bus.
With AMD's Direct Connect Architecture, the processor cores, memory controllers, and the I/O are directly connected to help eliminate the bottlenecks inherent in traditional front-side bus architectures.
It also features a sophisticated cache architecture with 192KB of total on-chip cache and data pre-fetch, a high-speed 200MHz front-side bus, and a superscalar floating point unit with support for AMD's 3DNow