This is not true we have a pretty good idea of where the A13 stands. Anandtech has run SpecInt and SpecFP on the A13 and shows it to be in the same range of per

This is not true we have a pretty good idea of where the A13 stands. Anandtech has run SpecInt and SpecFP on the A13 and shows it to be in the same range of performance as a Xeon Silver 4112 (2.6ghz base/3.0ghz turbo), which is a 14nm chip from 2017. So not as fast as the latest processors on a per core basis, but still pretty damn fast. Can't really make assumptions, but you would think with the higher thermal envelope Apple can boost clock speeds making them even more competitive.