The
i5-4590 is based on
Haswell architecture while the
906ED 2.1GHz is based on
Comet Lake.
Using the multithread performance as a reference, the i5-4590 gets a score of
144.8 k points while the 906ED 2.1GHz gets
657.2 k points.
Summarizing, the
906ED 2.1GHz is
4.5 times faster than the
i5-4590 . To get a proper comparison between both models, take a look to the data shown below.