> Reading a quotation I found " 423-pin PGA Socket, Intel Pentium 4
> Processor
> 400 MHz."
> Is there a P 4 running at such a frequency?

        All P4s currently run at 400MHz Front Side Bus. P4s use a "quad pumped"
clock, which simply means that the chip sort of multiplies whatever clock
you give it by 4. The motherboard supplies the chip with a 100MHz clock and
the CPU multiplies it by 4. This is similar to the DDR in DDR RAM, although
the bus physically runs at 133MHz the chip multiplies the clock by two
(although in this case it simply looks at both the rising and falling edge
of the clock, clock multiplication isn't really needed) the RAM runs at
266MHz. If you want to get technical P4s simply phase shift the incoming
clock by 90 degrees, giving two clocks, 90 degrees apart, and it simply acts
of every rising and falling edge of those two clocks. The reason they do
this is because at the frequencies we are talking about physical distance
because a very important factor, running a 100MHz cleanly is much easier
then keep a 400MHz clock going across a bunch of wires. TTYL

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