Does a bigger power supply cost more in electricity bills(more to the question).

[curtains]

Does a bigger power supply cost more run(as in electricity bills) if say your running the same components, so say u had 2 identical computers but the only thing different was the power supply lets just say a 300w and a 600w to make things simple(i know that you wouldnt usually use a 600w psu in one that only requires a 300w one)?

 

[apj101]

any electricity change would depend on the hardware within the pc not just the PSU that feeds it, but any change is highly negligible

 

[Kornowski]

If you are worried about the PSU using more energy, thus costing more to run.

You could get a PSU that fits in with the 80 power standard rule.

Like my Antec, it's 80% efficiant, meaning that it will waste less power, lowering the amount going to waste, lowering the electric bill and helping the planet out.

 

[ceewi1]

A power supply will only put out the amount of power required. In general, PSUs will be slightly less efficient when run at low loads, but the difference is only a couple of percentage points, and the actual efficiency of the PSU is a far more important concern.

 

[Geoff]

Just to reiterate what others have said, the power of the PSU doesnt depict how much power the PC will use. Say you bought a 500W and a 1000W PSU, the power supply will only use what is needed by the PC.