if Strix Halo is a real product (mega APU with 40 CU igpu, basically 6700 XT CU count, but modern rnda) when accounting for the nerf of switching to system ram over graphics ram performance, youd get ~PS5 performance at a 100W cpu.

you’d need to probably sit down at least 3 AMD gpu generations to bring that power consumption down to 30W where it would more practically be seen on handhelds. AMD gpu generations are roughly 25% generation over generation given same CU count. Id reckon 2028 at the earliest where it would be physically viable. (wont be cheap, would be like 1000$+ device)