Calling Gracemont (the E cores) “Atom technology” is a bit weak. They support out of order execution and AVX2.

Gracemont is faster, clock-for-clock than Broadwell and nearly as fast as Skylake running ChaChaPoly-1305, as used in WireGuard, largely due to avx2.

Intel’s benchmarking shows 80% performance peak vs peak of 4C of Gracemont vs 2C4T of Skylake.