why cpu MHz in /proc/cpuinfo different from model spec?

I lease a couple different dedicated servers with different hardware
specs. As far as I can tell, in /proc/cpuinfo , when it's an Intel
chip, the megahertz given in the model name agrees closely with the
actual value of "cpu MHz" reported:

model name : Intel(R) Celeron(R) CPU 2.80GHz
stepping : 9
cpu MHz : 2800.618
===
model name : Intel(R) Celeron(R) CPU 1.70GHz
stepping : 3
cpu MHz : 1717.057
===
model name : Intel(R) Celeron(R) D CPU 3.33GHz
stepping : 5
cpu MHz : 3330.268

but when it's an AMD chip, the reported cpu MHz is much less:

model name : AMD Athlon(tm) XP 2800+
stepping : 0
cpu MHz : 2125.300
===
model name : AMD Sempron(tm) 2500+
stepping : 1
cpu MHz : 1749.922
===
model name : AMD Sempron(tm) 2200+
stepping : 1
cpu MHz : 1494.263

I think the machines are mostly running CentOS. Has the evil
Microsoft/Intel conspiracy extended to engulf CentOS as well, so that
it's now deliberately reporting AMD chips as slower? :) Or is there a
simpler explanation.

-Bennett
.

Relevant Pages

  • Re: why cpu MHz in /proc/cpuinfo different from model spec?
    ... chip, the megahertz given in the model name agrees closely with the ... model name: IntelCeleronCPU 2.80GHz ... but when it's an AMD chip, the reported cpu MHz is much less: ... it's now deliberately reporting AMD chips as slower? ...
    (comp.os.linux.misc)
  • Re: why cpu MHz in /proc/cpuinfo different from model spec?
    ... As far as I can tell, in /proc/cpuinfo, when it's an Intel ... chip, the megahertz given in the model name agrees closely with the ... model name: IntelCeleronCPU 2.80GHz ... but when it's an AMD chip, the reported cpu MHz is much less: ...
    (comp.os.linux.misc)
  • Re: why cpu MHz in /proc/cpuinfo different from model spec?
    ... chip, the megahertz given in the model name agrees closely with the ... but when it's an AMD chip, the reported cpu MHz is much less: ... it's now deliberately reporting AMD chips as slower? ...
    (comp.os.linux.misc)
  • Re: why cpu MHz in /proc/cpuinfo different from model spec?
    ... As far as I can tell, in /proc/cpuinfo, when it's an Intel ... chip, the megahertz given in the model name agrees closely with the ... model name: IntelCeleronCPU 2.80GHz ... but when it's an AMD chip, the reported cpu MHz is much less: ...
    (comp.os.linux.misc)
  • Re: New computer Linux memoquestion
    ... There was a time I would only install AMD in the lowest price machines. ... Intel has been coasting for years while AMD created ... two CPUs on a single chip, with independent caches and a single memory channel. ... go out the CPU to the North Bridge, out to the memory, back in the same bus to ...
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