I read this thread twice. Really great info here. I really wish there was an easy way of recording voltage overshoot like we can ( sort of) with vdroop when looking at vccin under load. With my 7900X, I didn't allow for much vdroop, but with this 10980 I set vccin to ~1.8-1.82 and lower my LLC as much as I can without causing issues. Currently at 1.8V vccin and LLC4 which allows the vccin to drop to ~ 1.74. So far everything seems fine. One thing I have heard is that higher vccin voltages can cause excessive heat. If this is true, it gives further advantage of using a lower vccin.