Up until Haswell the standard wattage mobile CPU could be slightly overclocked through raising the max CPU multiplier by 2x. So, for example the 4700HQ could be configured to go from 3.2/3.4 Ghz in multi and st loads respectively to 3.4/3.6 Ghz.
However, AFAIK on Skylake this was changed, and there're no more room to play with multipliers. It not that big of a loss anyway, since the 200Mhz one could squeeze is easily gained back by a far more responsive clock control in Skylake (Speed Shift).
If you have a 6700HQ just enjoy it
