The ProBook 445 and 455 are barely three months old and they will soon be updated with faster models come this Summer. Much like the upcoming Lenovo IdeaPad C340 series, the newer SKUs will have second generation AMD Zen APUs for potentially cheaper starting prices than the usual Intel U-class options.
https://www.notebookcheck.net/Upcoming-HP-ProBook-445R-G6-and-455R-G6-will-carry-AMD-Ryzen-Zen-processors.414624.0.html