10 May
2010
10 May
'10
4:36 p.m.
On 05/10/2010 11:43 AM, Tony Duell wrote:
So I ask again. What clock signal is this 2GHz
refering to?
The x86 processors from Intel and AMD contain an internal PLL which
multiplies the external clock to produce an internal clock for the
processor pipeline. Most of the CPU core is running on that core
clock. (In the case of the Pentium 4 and derived processors, some of it
actually operates at twice the core clock.) Instructions take a
variable number of cycles to execute, but there are multiple
instructions "in flight" at any given time. The average number of
instructions executed per clock cycle is greater than one.
And does it
relate in any way to some signal I can actually put a probe on?
It does in that it is a multiple of the signal that you can probe.
Eric