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The memory bus connects the northbridge and RAM, just as the front-side bus connects the CPU and northbridge. Often, these two buses must operate at the same frequency. Increasing the front-side bus to 450 MHz in most cases also means running the memory at 450 MHz. In newer systems, it is possible to see memory ratios of "4:5" and the like.
The Intel 440BX is the third Pentium II chipset released by Intel, succeeding the 440FX and 440LX.With the new 100 MHz front side bus, Pentium II CPUs were able to scale better in performance by reducing the difference between processor clock and bus speed.
For calculation, the CPU uses actual bus frequency, and not effective bus frequency. To determine the actual bus frequency for processors that use dual-data rate (DDR) buses (AMD Athlon and Duron) and quad-data rate buses (all Intel microprocessors starting from Pentium 4) the effective bus speed should be divided by 2 for AMD or 4 for Intel.
Bus Speed & Type [a] Cache Socket Memory Controller Features L1 L2 L3 SIMD Speed/Power Other Changes Am386 Am386: Sx/SxL/SxLV [1] 1 No 25–40 [1] FSB 100 PQFP [1] discrete: Am486 [2] 500, 350 Am486: 1 No 25–120 FSB 8 168 pin PGA 208 SQFP discrete: 500, 350 Enhanced Am486: 66–120 FSB 8, 8/16 168 pin PGA 208 SQFP [3] Am5x86 350 Am5x86: X5 ...
66 (more specifically 66.667) megahertz (MHz) is a common divisor for the front side bus (FSB) speed, overall central processing unit (CPU) speed, and base bus speed. On a Core 2 CPU, and a Core 2 motherboard, the FSB is 1066 MHz (~16 × 66 MHz), the memory speed is usually 666.67 MHz (~10 × 66 MHz), and the processor speed ranges from 1.86 gigahertz (GHz) (~66 MHz × 28) to 2.93 GHz (~66 MHz ...
The Northwood and Willamette cores feature an external Front Side Bus (FSB) that runs at 100 MHz which transfers four bits per clock cycle, thus having an effective speed of 400 MHz. Later revisions of the Northwood core, along with the Prescott core (and derivatives) have an effective 800 MHz front-side bus (200 MHz quad pumped).
It is connected directly to a CPU via the front-side bus ... using Pentium 4 processors or Celeron processors that have a clock speed greater than 1.3 GHz and ...
The Intel QuickPath Interconnect (QPI) [1] [2] is a scalable processor interconnect developed by Intel which replaced the front-side bus (FSB) in Xeon, Itanium, and certain desktop platforms starting in 2008. It increased the scalability and available bandwidth.