Was getting identical idle temps in HWinfo in BIOS.
So reverted back to BIOS 804, same issue.
Loaded defaults, same issue.
Finally cleared CMOS using button on back panel and it seems I am back to normal!
Have no idea how this occurred but will stick with BIOS 804 for now.
My main motivation in trying ther latest beta BIOS is to see if the fanxpert issues have been fully resolved.
Seems quite flaky to me right now, especially in manual mode.