Is an i7 6700HQ Overclockable
Is an i7 6700HQ Overclockable
Not familiar with other models besides the HK ones. Most mobile BIOS systems don't allow any kind of overclocking either. That's probably a good idea since the CPU is already working hard, and going further could damage it.
I think the Intel Extreme Utility might allow some minor overclocking, similar to a BCLCK OC on a desktop. However, laptop cooling solutions are generally enough for base or boost speeds only. It's unlikely you could achieve meaningful improvements without overheating.