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FSB, CPU bus, difference?

The CPU Bus and the FSB are basically the same, or at least related. On a Pentium 4, for example, the CPU Bus is the 'actual' FSB, and on P4s, is either 100 Mhz, 133 Mhz, or 200 Mhz. The FSB on a Pentium 4 is quad-pumped to 800 Mhz FSB, the 'effective' FSB.
 
on the comp i got a benchmarker (CPUZ) says that my FSB speed is 100 Mhz and my Bus speed is 400 Mhz, what's the difference between tha two?
 
Maybe I messed things up. On an Intel P4, the effective bus speed is 4x FSB then. Your FSB is 100 Mhz, but because Intel Pentium 4s use 'quadding' which makes the effective FSB 4x the FSB.
 
yeah i know this, the question i am trying to answer is are these two things different? and why is it neccesary to list them separetly...?

btw, ty for replies. :p
 
They are different from each other. It used to be that FSB and CPU Bus speed were the same. However, with the advent of double-pumping and quad-pumping that AMD and Intel introduced, Bus speed and FSB became differentiated from one another. The FSB is now the 'actual' bus speed, whereas the CPU bus speed is the effective speed due to the techniques intel and AMD (or whoever) uses.
 
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