10nm rates to be more power efficient.
the smaller density will in part be used to get more components on a chip.
Partly for better performance, partly for economics.
Intel high power consumption today comes from overclockers or others looking for maximum multicore performance.
For most of us, it is time to abandon overclocking as a means to get something for nothing.
Processors of today are binned and sold at their maximum performance level.
Current processors do a good job of turbo management.
How well you can do is determined by how good your cooling setup is.
No doubt, you will get more for your money with intel 12th gen.
Otherwise, why introduce a new product at all?