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This little program uses the rtdsc register on you x86 processor to determine it's clockspeed. 

[james@circe clockspeed]$ ./clockspeed 
$Id: clockspeed.c,v 1.1 2001/12/16 16:51:27 root Exp root $
(c) 2001 James McKenzie - No warranty
Speed is 1395.8 MHz [1395.79054-1395.80170]
[james@circe clockspeed]$

Get it here.