chart of stable Mhz - VID of my R5 3600
my 3600 has the 2nd and 4th cores very weak, I guess they need 0.1v more than other cores to run P95 small FFTs stable at same frequency. that result my CPU can't get a good OC result.
below chart is what I get from testing -- X axis is the frequency, Y axis is the VID required to get it run P95 small FFTs without error. blue line is what I set in Ryzen master, red line is what Hwinfo show during P95 run. From the chart we can see if need to push all cores at 4.2G the VID need to be 1.39v, although my cooler can't handle the heat.