Do high-end graphics cards raise your electricity bill by much? – Super User

Keep in mind that a 450W PSU does not draw 450 watts of power.

Your computer only draws as much power as required for its operation. As a matter of fact, the highest demand for power is when you first turn on your PC to spin up all the hard drives, DVD/CD drives, fans, etc. The increased capacity PSU has to handle that load which can be several times the power demands of a steady-running PC.

via Do high-end graphics cards raise your electricity bill by much? – Super User.

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