Unlike the EliteBook xx0 or ProBook xx0 series, the alternative xx5 series is equipped with AMD options that are typically less expensive than the standard Intel offerings. All of the new models will carry the same Ryzen 3 PRO 2300U to Ryzen 7 PRO 2700U APUs and integrated Vega graphics. The updated systems will succeed the poorly-received Bristol Ridge APUs as found on the EliteBooks and ProBooks of yesteryear.
https://www.notebookcheck.net/HP-EliteBook-735-745-755-G5-and-ProBook-645-G4-launching-this-month-with-AMD-Ryzen-PRO.303074.0.html