(Try to write some blogs in English to improve my writing technic.)

I bought a Ryzen 5700G CPU with ASRock A520M-ITX/ac as my living room HTPC. With Sony 77A80J, I can’t even set color depth to 10bit with RBG4:4:4 at 4k 60hz, let alone at 4k 120hz. It said A520M-ITX/ac support HDMI ver 2.1 on ASRock’s website, but after changing several cables, the problem was not gone away. My conclusion is that the HDMI port’s bandwidth is likely limited to HDMI 2.0b. Limited by its 14.4Gbit/s bandwidth, 2.0b allows 4k 60hz 4:4:4 8bit(12.54) / 4k 60hz 4:2:2 10bit(10.45), but not allows 4k 60hz 4:4:4 10bit(15.68).

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