Interesting to note that leaving the CPU standard without OC-ing seemed to give the best results. I had mine OC’d @4.3GHZ all cores but it seems the 3950x is very good at turbo boosting cores as needed so no benefit to OC-ing it would seem.
@Jouleskey do you have an XMP setting in your BIOS for your ram, I have the same and I did, I just run it on that. If that’s all good then you can manually adjust settings to fine tune.
M