Thanks for the guide ,this has helped me solve a few problems I had.
I have tried my own ssdt created using pikers latest ssdt gen for the i5 6600k and only got 4 speedsteps 900mhz,3500,3600 and 3700mhz.
with your ssdt I get the same speedsteps and without a ssdt I get 1000,1300,3500,3600mhz...