What did you set your PBO limits (PPT, TDC, EDC) to? If its stock 5600x limits (i.e. 76w 60a 90a) then it makes sense for the effective clock to be limited to those values

But if you already set PBO limits to motherboard, idk...maybe someone else can help?

I'll test the 200mhz settings for a while to check if mine also give the same behavior, brb

Edit: ok no point in testing, since I remember I already did this before. with pbo limits set to motherboard, the mhz offset will help single single thread, but wont help much in multithread since its already the silicon limit. during CB MC runs is still around 4675mhz for me, but SC does boost to 4850mhz

Idk how true this is, but i read some reddit and other forum posts out there saying that 1.35v++ is ok if only a few cores being boosted in short bursts, but its getting unsafe if that 1.35v++ is during sustained allcore boosts.
The cpu will definitely reduce its boosts a bit when it reaches that set temperature, but if u feel that it doesnt affect your specific game performance then why not.