Speaking of that I was in MicroCenter the other day and saw what I thought was a heat exchanger for a small air conditioner inside one of their display computers. I think it was an RX7900 video card. So much for more efficient processors. Unless I needed a space heater, I'd never run one of those. Only saving grace is when it breaks I'd have a nice heat sink for my peltier module projects.
If we're going to continue down this path, maybe make these GPUs water-cooled, and have a hot water tank nearby. At least the waste heat will go towards something useful. I recently installed a 4 gallon hot water heater under my kitchen sink so I can turn off my very wasteful oil furnace during the eight warmest months. To shower I'll just kick it on about 15 minutes before showering, then turn it off again when I'm done. Anyway, the heater has a 1400W heating element. I figure a 300W GPU could do almost as good a job. It would just take two hours to recover if I used all 4 gallons, versus about 30 minutes now. With my hot water usage, that's fine. Normally I just have a few dishes at a time to wash.