The
i9-12900KF is based on
Alder Lake architecture while the
E5-2651 v2 is based on
Ivy Bridge.
Using the multithread performance as a reference, the i9-12900KF gets a score of
491 k points while the E5-2651 v2 gets
426.2 k points.
Summarizing, the
i9-12900KF is
1.2 times faster than the
E5-2651 v2. To get a proper comparison between both models, take a look to the data shown below.