Looking for measured power consumption of some old DEC

In general thermodynamic terms, yes, but where I live, primary winter heat is usually natural gas or propane (for those at the fringes of town outside of the extensive natural gas network), and heating with electricity here is much more expensive than burning gas. For those that live in parts of the world where electric heat is the best/only choice, you might as well pass those electrons through something that gives you compute cycles vs a big, fat load resistor. On the "green" aspect of this - I recently saw an article that for many households, there are enough incandescents left on around the house that they impact the amount of heat the furnace needs to put out to achieve the desired house temperature (i.e., switching to CFLs shifts more energy load to the primary furnace because you have "lost" a few hundred watts of ambient heat being poured into the house through the bulbs). OTOH, it's a double win in the summer if you have AC (I do not) - less heat from the bulbs means less load on the AC.