The
Z1 Extreme is based on
Zen 4 architecture while the
906EC is based on
Coffee Lake.
Using the multithread performance as a reference, the Z1 Extreme gets a score of
553.4 k points while the 906EC gets
494.2 k points.
Summarizing, the
Z1 Extreme is
1.1 times faster than the
906EC. To get a proper comparison between both models, take a look to the data shown below.