Going from a 85% to a 90% effecient PSU worth it?



New Member
How much actual wattage drop with a given PC going from a 85% efficient PS to a 90% efficient rated around 600w? IOW's when measuring the AC current at the wall, using a 600w supply as the example, how much less wattage could I expect? 5, 10, 15 watts?

Is the extra $$ worth it?


Procrastinating Member
Instead of asking your question in that form, think of your usage. How much time does your PC spend at idle? Do you game? The reason behind these questions is that your PC will probably spend much of its time at idle or at relatively low power levels, typically something between 50 and 100 watts, and most psu's are less efficient at low power outputs, varying from brand to brand and model to model. So to answer this question properly, you'd need to know your typical usage and then look at a given psu's actual efficiency at that power level. The best psu tests, such as at SPCR and JohnnyGuru will have those figures.


If you were running a significant amount of them 24/7 maybe.. single psu with avg usage? Nah. Unless you're upgrading from a generic or needed the extra amps etc.. i'd not bother.


Active Member
Ditto, In almost any cases, upgrading even from a 80+ Bronze to a 80+ Gold or Platinum will not pay for itself unless you use it 24/7 for 2 years or so, especially since Gold/Platinum tend to be very expensive.
They are fine for replacements or new builds, but upgrading strictly for efficiency would not be worth it IMO, unless it's a from very old standard 80+ design.