Even the top of the line gaming PC's hardly draw 750w under full load, mine is pretty much the maxed out Gen4 and running stable diffusion will put it at 575w at absolute most, and that's including my monitor and peripherals (speakers w/ subwoofer, USB etc). Normal gaming will vary, 2077 pushes it to the 450w range sometimes but not much. And even then, I'm gaming for maybe 3 hours at most?

If I were running Stable Diffusion over night, that's one thing and it would definitely get my room to 90F. But a few hours gaming, even 8+ hours isn't too much to account for, especially if it's used to offset other costs - for example using an electric heater/radiator that draws 1500w and has no other use other than providing temporary heat.

I also think we have plenty of ways to game with low power if the mobile PC market is anything to go by. We don't necessarily need 3080-4090's drawing 500w for their full loads. Especially if we adopted other means of powering our grid, at that point it's only an issue of the heat generation, which is sort of a necessity anyway so if we're going this way then we may as well build homes with PC generated heating in mind! (\s but maybe lets do it?)