Is the 8700G now being throttled at 75c? Screenshot below is from a Cinebench multi-core run. Build is AsRock 620I ITX with BIOS 2.08. This did not occur with previous BIOS version,
AMD 8000 series G processors mistakenly have STAPM enabled. Gamers Nexus was the first to point it out, here's an article by Anandtech if you'd rather read about it.