Question extremely efficient but lower power power supply?

GunsMadeAmericaFree

Senior member
Jan 23, 2007
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I am putting together a new system. It's already pretty efficient, with a Ryzen 5 5600G processor.
However, I also realize that there are different efficiencies from a power supply perspective. I remember
ages ago, there were gold, silver and other colors that supposedly gave an indication of power efficiency.
I obviously don't need a high powered one, because I tend to go with built in graphics, or limit myself to video
cards that use 70 Watts or under.

Is there a more modern way to evaluate efficiency of power supplies, other than silver/gold type ratings?
 

Pohemi

Diamond Member
Oct 2, 2004
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There are also Platinum and Titanium ratings, but they'll likely be higher wattage (especially the Titanium).
 

mindless1

Diamond Member
Aug 11, 2001
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How much extra are you willing to pay, to shave very little off the power bill? The first one igor linked, no way would I pay $123 for a system probably peaking under 150W or up to 200W with the sub-70W video card, unless there's a chance you might want a high power gaming video card in the future.

The efficiency differences running in this 150W range (typical/avg. idle power under 100W) are not much, very few watts difference, maybe $4/year (or less) difference on the power bill. I pulled that "4" out of thin air, you can do vast research and math and testing with multiple PSU if you like, since each system and use scenario is a little different.

No, there is no more modern way, other than shooting for something higher than bronze like gold or platinum (which in this case, IMO is overkill), or looking at reviews to see each PSU's efficiency at this low ~100W-150W load range. At the same time, a higher tier PSU could be expected to give you more years of lifespan even at a lower load, and there is the warranty length increase if that matters to you.

I'm just suggesting that if the build isn't using expensive components and doesn't use a lot of amps, something like a $54 600W Thermaltake GX2 Gold should be fine, otherwise wait for some sale/deal as PSU prices are still pretty high right now, some models that were on sale around $60 2-3 years ago are up around $120 now:

 
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GunsMadeAmericaFree

Senior member
Jan 23, 2007
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Dang, I just found a spare power supply up on the shelf in the basement when I filed away some paperwork last night. It must have been from a sale 2-3 years ago, because I had completely forgotten about it. I'll have to look up the specs later after work.
 
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mindless1

Diamond Member
Aug 11, 2001
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Go ahead and use it, would take several years (if ever) for something more efficient to pay for itself in power bill savings, unless what you bought and found last night, was an ancient group regulated, generic unit.

Then again I like to always have a spare PSU on hand, so if that's your only spare, I'd buy another PSU anyway, with high enough specs that it could handle *any* other system I have running.
 

In2Photos

Senior member
Mar 21, 2007
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Then again I like to always have a spare PSU on hand, so if that's your only spare, I'd buy another PSU anyway, with high enough specs that it could handle *any* other system I have running.
Same. I had an EVGA 650W that would have covered all the other systems in the house, but I just bought an 850W for my new build.
 

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