Both models
i5-10400F and
906ED 2.1GHz are based on
Comet Lake architecture.
Comet Lake was released in 2019 as a 14nm process-refinement. These models were released as 10th generation CPUs like 10nm Ice Lake. There are model with 2 to 10 cores.
Using the multithread performance as a reference, the i5-10400F gets a score of
370 k points while the 906ED 2.1GHz gets
657.2 k points.
Summarizing, the
906ED 2.1GHz is
1.8 times faster than the
i5-10400F. To get a proper comparison between both models, take a look to the data shown below.