The
906EC is based on
Coffee Lake architecture while the
i7-6900K is based on
Broadwell.
Using the multithread performance as a reference, the 906EC gets a score of
494.2 k points while the i7-6900K gets
427.5 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.