3700x ARRIVED!!! Updated Asus C6H Hero to bios 7201. Removed 1700. Dropped in 3700x. 1st boot took a bit while system retrained.. installed chipset drivers.. restarted, set mem to XMP (3200).
All up and running :-)
I'm happy. A simple bios update and able to drop the latest CPU in and even able to get PCIe 4.0 as a bonus