> That saves me $ and helps the environment a little bit :)

Seems like a tradeoff with power though. Even emulating hardware from that era is more power efficient than actually running it. Of course, if you have custom ISA cards or something then you are likely stuck :)

I don't know about the progression of PSU efficiency, but 32bit desktops were rocking 250-400w PSUs and modern desktops would be hard to find one less then 650w so sure maybe we're more efficient for the amount of compute/W but running flat out will still hit your pocketbook harder on a modern system.