Possible to overclock Dell Notebook 640m?

I tried to overclock my old dell laptop with clockgen, setfsb and cpucool, they claimed to have the right pll as well but it still didn't work - with clockgen i could change the fsb and apply it and the memory speed would change, in clock gen, but in cpu-z nothing had changed :(

I dont think its very easy to overclock a laptop.
 
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