[quotemsg=19931195,0,127027]Good review, now de-lid it and pair with 3600Mhz+ ram and stretch its legs.[/quotemsg]
It doesn't make much sense to de-lid the 7740x. It's main advantage is that you can upgrade to Skylake-X without replacing the motherboard. You don't de-lid a CPU if you can't afford the next better CPU (assuming you're not making a more fundamental mistake). Beyond that, the 7740x has marginally higher clock speeds, but that is a moot point if you compare a de-lidded 7740x to a de-lidded 7700k.
Add the price difference into the mix, and things quickly favor the 7700k. Not including the platform, you'll probably screw up your first one or two attempts at replacing the TIM. That means the 7700k has an advantage of $100-$150 in the CPU alone. Once you account for that motherboard, you're down several hundred dollars if you go with the 7740x.
For the additional money, you don't really get anything. The additional capabilities of the x299 are totally lost on the 7740x.