The
E5-2651 v2 is based on
Ivy Bridge architecture while the
5800X is based on
Zen 3.
Using the multithread performance as a reference, the E5-2651 v2 gets a score of
426.2 k points while the 5800X gets
479 k points.
Summarizing, the
5800X is
1.1 times faster than the
E5-2651 v2. To get a proper comparison between both models, take a look to the data shown below.