PC’s don’t need a discrete GPU to play games. Many CPU’s have onbord graphics that can play a decent amount of games. The main issues are power consumption, heat dissipation, and the expectations of the user. The steam deck for example has a 720p screen. That will mean less work for the graphics hardware how ever even with this advantage the processor has a power limit of I think 15 watts. This is because all that heat in a small area is hard to get rid of especially for a handheld.
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