For anyone wanting to control speed/power usage under DOS on an Intel CPU,  
I have created a small utility to query/set the relevant MSRs. I have only  
tested it on a PentiumM, where the voltage translates as 0.700+vv*.016 but  
it should work on Core CPUs although the voltage formula is different.  
Beware it is possible to make your system unstable if you set values out  
of spec.

source and binary here:

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