cat /proc/cpuinfo shows 3.00GHz model but 1400.000 cpu MHz?

I ran this command on ssh to see CPU info: cat /proc/cpuinfo
And it says:

...
vendor_id       : GenuineIntel
cpu family      : 15
model           : 4
model name      : Intel(R) Pentium(R) 4 CPU 3.00GHz
stepping        : 3
cpu MHz         : 1400.000
cache size      : 2048 KB
...

Why is cpu Mhz 1400 ? Wasn’t it supposed to say 3000Mhz ?
OS is CentOS 6.0

the 1400 means that at which speed the processor is running RIGHT now.
3000 is the Max cpu speed.

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