Question about when I run cpuz?

Question

This is on my old computer, whats the difference between rated FSB and Bus speed.

It says 133 Mhz for Bus speed

and says Rated FSB- 533 Mhz

whats the difference or can someone explain why

Answer 1

The bus speed is the actual clock frequency of the FSB, in this case 133 MHz.

Intel uses a technique called 'quad-pumping' on the FSB, which allows it to perform 4 transfers per clock cycle, effectively making it seem like 133 x 4 = 533 MHz, which is the rated FSB.