These would be the fastest dual-cores in Intel's entry-level ULV offer to date, but do not expect anything too crazy, since they are using the old 14 nm manufacturing process. The Pentium Gold 6405U comes with 4 threads and is clocked at 2.4 GHz, while the Celeron 5205U does not support hyperthreading and is clocked at 1.9 GHz.
https://www.notebookcheck.net/Intel-Comet-Lake-U-Pentium-Gold-6405U-and-Celeron-5205U-CPUs-now-available.440685.0.html