Ok, so I have always assumed that since a lot of this old hardware doesn't use anywhere near the level of cooling that a modern machine does, se/30 motherboard

Ok, so I have always assumed that since a lot of this old hardware doesn't use anywhere near the level of cooling that a modern machine does, se/30 motherboard doesn't appear to bother with a CPU fan or heatsink, it uses a great deal less power. Am I incorrect in this, or is it all just the CRT?