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Hey, I just saw this, yeah, I probably could sometime this week and give you some pointers. Let me know which MSI board and what memory you have as well.

Also, what cooling are you using? Air, AIO 240mm, 360mm, custom loop? Also, what are you goals? Just cooler temps, or more performance as well?

My setup:
Ryzen 5900X
Msi mpg x570 gaming plus
Bequiet Dark Rock Pro 4
Kingston fury beast 2x16GB 3600Mhz (with XMP)
MSI RTX 3070ti ventus oc.
Now i have disabled PBO, my temps idle 38-42, cinebench R23 multicore 80, single core 75, when playing pubg about 76. I read, people making same or better performance with lower temperature with undervolting, but at this place i'm a little bit 'green man' )

So, you actually want to use PBO to undervolt, and at the same time you will get better performance. Are you familiar with the Curve Optimizer when PBO is enabled? The goal is to use a negative offset in the Curve optimizer to get lower voltages with higher clocks, then test for stability. Also, setting TDC, ETC & PPT manually will help a lot with temperatures as well.

I think yes, you know this better. I see people using curve optimiser -30, -20, -12 for Ryzen 5900X. I need more info about this. I now PBO disabled. I need enable it at 'PBO advanced'?

Yes, PBO advanced should open up all the settings for you. You will want to look at normal EDC, TDC and PPT limits as well for your 5900X. It "should" be similar to my 5950X as it is 2 CCDs. For reference, my PPT = 250W, TDC = 200A and ECD = 140A.

EDC has one of the largest effects on heat and clocks under load. I found 140A~160A to be a perfect range. If you are on AGESA 1.2.0.7, there is an EDC bug though. To fix it, leave it set to "Auto" in the BIOS and change it with Ryzen Master if you want to stray from stock settings. I believe the 5900X default is 140A like the 5950X.

Ok. From the first i need change PPT, TDC, ECD to your numbers and don't touch curve optimiser? Just PPT, TDC, ECD?