Yet another old PC computer. Previously I wrote about AMD Sempron 2300+. This one is newer, some kind of two core (not sure if it is Dual Core or Core 2 Duo), but power draw is similar.
It takes between 5.2 and 5.9W when powered off. When idle, it uses around 61W. After running burncpuk6 on one core, power usage increases to 80W. Running it on both cores increases energy use to 100W. Looks then, that putting load on each core is 20W more.
When I added dd, I noticed 102.3W on wattmeter. And running dd without stressing CPU was 68W.