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updated bios and has been rock solid since, having problems with VR now but suspect it is graphics card rx580
Try adding +5 to cores with curve optimiser.
Interesting point, but whats the possibility of getting 2 CPU's that are only capable of running 3200.. almost everyone's system I've seen (mostly youtube and forum sigs) are running 3600 with no issues (including myself). I think we can rule the CPU for now imo.
Next guess is that it's most likely a power issue with the mobo, what's your Vcore at ? You could try upping your Vcore a little bit (research this but don't let it scare you), test, reset to defaults, lower your CPU clock speeds and test again, see how that alters the behaviour of the chip. From what I understand you could use curve optimiser to do the same but haven't entered that rabbit hole myself.. yet.
It's a total pain in the ass when you don't have compatible components to test with
The chip is likely unstable when hitting the high SC 4.85 frequency so dialling in a 4.65 all core OC prevents it from reaching this and maintains stability.
If you look at the product page for the 5800X it says a max boost clock of 4.7 yet in reality these boost to 4.85 so maybe AMD have tried to push it a bit far and some of the chips don't like it.
