The microcode update that Intel is sending motherboard providers in response to the new ‘Plundervolt’ may turn off the ability to adjust CPU voltages via software. Is undervolting or overclocking at risk?

A new attack on Intel’s CPUs, called Plundervolt, may have an unforeseen consequence. The mitigation that fixes it appears to lock the CPU voltage to default settings, possibly preventing users from undervolting or overclocking them.
…
Read full post here:
https://www.pcworld.com/article/3489538/plundervolt-attack-against-intel-core-cpus-prompts-fix-that-disables-cpu-voltage-settings.html