7960x capping PBO at 4.8Ghz (bug in bios)?

On my Arock motherboard, I realized that under all conditions, the speed of the process (as reported by /proc/cpuinfo on Linux) was being capped at 4.8Ghz. I was able to add a 200Mhz offset to the bios (the limit) and it let it get to 5ghz, but this is still 300mhz off of the rated cap for this cpu. Is there a bug in the bios of this MB or a general issue--can anybody else check this and report their findings? Thanks! Geekbench once I got PBO working properly: https://browser.geekbench.com/v6/cpu/4073708 edit: And broken again... literally without a reboot, it went from boosting to 5.5 to back to 5.0 as the cap. Geekbench after: https://browser.geekbench.com/v6/cpu/4073941. Delta isn't significantly different. I'm calling it a day.