The
E5-2651 v2 is based on
Ivy Bridge architecture while the
i9-9900K is based on
Coffee Lake.
Using the multithread performance as a reference, the E5-2651 v2 gets a score of
426.2 k points while the i9-9900K gets
402.4 k points.
Summarizing, the
E5-2651 v2 is
1.1 times faster than the
i9-9900K. To get a proper comparison between both models, take a look to the data shown below.