1 of 1 people found this helpful
"Is this voltage damaging the CPU?" No, this is normal voltage for your configuration. The ~1.5v is to guarantee stability, this voltage is only applied when only 1 or 2 cores are being used and the voltage is only for a brief time (think microseconds). As the cores scales up for use the voltage will scale down accordingly.
e.g. 1 or 2 cores active=~1.48v, 3 or 4 cores active ~1.4v and so on until 6 cores 12 threads active ~1.35v.
CPU-Z is great but not to monitor voltages. Try HWmonitor or HWinfo64, this will give you a much better idea of actual voltage and watts being used during load and idle. Also there are 2 different readings, the CPU core voltage (SV12 TFN) and VDDCR CPU. This will differ ~0.50v during load. The CPU SV12 TFN is the voltage you want to be looking at. Ryzen master and CPU-Z read the VDDCR voltage and at load it is higher than actual voltage on SV12 TFN.
"How can I set the voltage so it would decrease when not needed and increase to 1.3 under load?" Make sure you have C-states enabled in your BIOS/UEFI this should allow vcore to drop to ~0.750v during idle (for any configuration, stock or under/overclocked). 1.3v is not enough vcore for XFR2 and precision boost to work, so if you want 1.3v max on vcore you need to turn off core performance boost and precision boost overdrive (BIOS/UEFI AMD CBS options) and manually overclock.
"Is it bad to run the system at 1.3 volts all the time?" No it is not bad, as long as the system is stable at the clock you set . Undervolting will result in lower performance, unless you are lucky and can run higher clocks at lower voltages than stock which would be 4.25ghz@~1.45v (your stock config with XFR2 and performance boost).
Best of luck o7