na na na...
you cant give more watts to an CPU.
this Watts we say is how much power the CPU consomes, and TDP (in watts too) is how much heat its generate
lets give an example
X CPU works with 1GHz, 1 volt and consomes 50W
well if i downclock this cpu to 500 mhz and 0.5 volt, the cpu will consome 25W
if i overclock to 2 Ghz and 2 volt the cpu will consome 100W
understand
the reason you CPU could not reach higher speed is not this, but another reason