The
i9-7980XE is based on
Skylake architecture while the
506E8 3GHz is based on
Kaby Lake.
Using the multithread performance as a reference, the i9-7980XE gets a score of
1223.8 k points while the 506E8 3GHz gets
210.9 k points.
Summarizing, the
i9-7980XE is
5.8 times faster than the
506E8 3GHz. To get a proper comparison between both models, take a look to the data shown below.