Yes but the power difference here isn't 1kW, so over an hour it's not 36 cents. At peak usage the difference is 100 watts, so 3.6 cents difference per hour if y

Yes but the power difference here isn't 1kW, so over an hour it's not 36 cents. At peak usage the difference is 100 watts, so 3.6 cents difference per hour if you're running at benchmark level performance constantly. Realistically even at 0.36EUR/kWh the idle power difference means you're probably spending 1-2 cents per hour. That's really nothing. We're talking about saving about as much as replacing 1 halogen light bulb with an LED bulb.