Why not paste unedited reply from Robert?
"Every motherboard you have ever seen or heard of meets the AMD minimum specifications for electrical capacity, and exceeds it by some amount of margin. The CPU will not use any VRM headroom beyond the minimum specification unless you tell it to do so with PBO or manual OC. If someone isn't overclocking, better-than-AMD-recommends power supplies just look pretty.
I hope this, in a roundabout way, answers your question.
EXAMPLE: A 105W Ryzen Processor will never use more than 142W socket power; 95A from VRMs when they're thermally-constrained; or 140A from the VRMs when they're not constrained. That's hard-coded into the firmware until you tell the CPU to ignore it. Any motherboard rated for 105W Ryzen processors will meet this and then some. If the motherboard is significantly overbuilt, that extra capacity is does not assist the processor in any way until you override the OEM behavior."
Key take-away points are:
* every AM4 motherboard ever produced meets and exceeds AMD's minimum specification for given TDP (which is 95A sustained and 140A burst load for 105W)
* no matter CPU model, it will not go beyond minimum specification unless you enable PBO or manually override current limits
* Any motherboard designed for 105W TDP (no matter A320 or X570) will guarantee normal non-OC operation of your CPU
Simple take-away - If you plan OC and maximising performance, pay attention to which board you buy or already own and make decision based on that.
For anyone already invested in the platform, no need to worry, just buy new CPU of your choice, update BIOS and enjoy at least stock operation without any issue. Most of AM4 1st and 2nd gen motherboards will allow decent overclock, same as they did on older Ryzen.
Any one of us can use a bit of common sense and imagine backlash from unhappy customers if they got different stock performance on their old B350 board officially supporting new Ryzen 3900X compared to someone with X570 board. Stock is stock and this is what AMD is officially guaranteeing on any AM4 board with official BIOS support. Anything else, like PBO or XMP is technically OC and there are no guarantees.
Vote with your wallet guys, I personally will keep X370 board and enjoy new Ryzen, while saving money for new GPU (well, technically my son will have to save money ).