While avoiding Chinese-made computer components approaches impossibility the deeper you go, one vendor I'd trust not to fool around with AMD's PSB is System76.

While avoiding Chinese-made computer components approaches impossibility the deeper you go, one vendor I'd trust not to fool around with AMD's PSB is System76. Not only are they non-shady, but they also try to open the firmware of the motherboards they use. While their AMD systems aren't quite there yet, the laptops they sell are. https://github.com/system76/firmware-open https://github.com/system76/firmware-open https://github.com/system76/ec https://github.com/system76/ec