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I was actually being generous with my 15W comment (assuming the Pro would get a larger form factor).
Switch is 11W docked. The SoC itself is probably at less than 10W.
As for the AMD APUs, the best we had a year ago was the Renoir 4800U with 1.79 TFLOPs but those were only sustainable when working at 25W.
Regardless, even if this iGPU has enough compute throughput to match a PS4, its memory bandwidth and pixel fillrate are too short to consider it similar in performance.