The
i7-6900K is based on
Broadwell architecture while the
906EC is based on
Coffee Lake.
Using the multithread performance as a reference, the i7-6900K gets a score of
427.5 k points while the 906EC gets
494.2 k points.
Summarizing, the
906EC is
1.2 times faster than the
i7-6900K . To get a proper comparison between both models, take a look to the data shown below.