GTX 1080 PSU?

[ramo55]

I've been reading left and right about what the minimum PSU for the gtx 1080 is. On the box it says minimum 500w, on the internet it ranges anywhere from 380 to 600 so i'm really not sure. as of now, I have a 550W corsair psu, would that be enough? The cpu is a 4770k, overclocked to 4ghz. I tried the coolermaster power calculator and it say 460 watts or something so I'm lost right now.

[Guest]

Which Corsair 550W PSU?

 

[ramo55]

Just now, jonnyGURU said:

Which Corsair 550W PSU?

 

rm550x https://www.corsair.com/uk/en/Categories/Products/Power-Supply-Units/Power-Supply-Units-Advanced/RMx-Series/p/CP-9020177-UK

[Daniel Z.]

5 minutes ago, ramo55 said:

rm550x https://www.corsair.com/uk/en/Categories/Products/Power-Supply-Units/Power-Supply-Units-Advanced/RMx-Series/p/CP-9020177-UK

That's more than good enough for the 1080

[ramo55]

1 minute ago, Daniel Z. said:

That's more than good enough for the 1080

any idea why the box says minimum 500w? is that just to be on the safe side or whats the idea behind that number?

[Tristerin]

2 minutes ago, ramo55 said:

any idea why the box says minimum 500w? is that just to be on the safe side or whats the idea behind that number?

Bogus number, to ensure you have more than enough so no one can complain when they try to add this to their 280w LiteOn PSU computer.

[Fasauceome]

2 minutes ago, ramo55 said:

any idea why the box says minimum 500w? is that just to be on the safe side or whats the idea behind that number?

it's just to be on the safe side.

 

11 minutes ago, ramo55 said:

I tried the coolermaster power calculator and it say 460 watts or something so I'm lost right now.

psu calcs are bogus

[Darkseth]

5 hours ago, ramo55 said:

I've been reading left and right about what the minimum PSU for the gtx 1080 is. On the box it says minimum 500w, on the internet it ranges anywhere from 380 to 600 so i'm really not sure. as of now, I have a 550W corsair psu, would that be enough? The cpu is a 4770k, overclocked to 4ghz. I tried the coolermaster power calculator and it say 460 watts or something so I'm lost right now.

Like in the other Thread i mentioned: These "calculators" are often not realistic. They don't show you the realstic power usage, but more like a recommendation.

 

And what's recommended on the Box is a Number which also takes bad PSUs into account, who don't deliver the Power they should. Like a Combat Power 750w PSU, that alrady shuts down at <500w Loads, and costs 25 bucks.

 

 

I have a GTX 1080 MSI Gaming X (a  Model, that has a little bit more power usage. Stock, it consumes 215-220 Watt, while other models are at 180-200 watt).

I also have an i7 6700K @ 4.4 Ghz at 1,28 Volt.

2 HDDs, 2 SSDs, 3 Fans, 4 Ram sticks.

 

If i leave my GTX 1080 at pure Stock (it runs very inefficient there), my PSU draws like 350-360 Watt out of the Wall.
Minus the Efficiency (let's calculate with 90% PSU efficiency), the PSU might draw 360 Watt out of the Wall, but the Computer only consumes 325 Watt~. Keep that Efficiency difference in Mind).

 

So even here, a good 450w PSU would be perfectly enough. I would recommend 500-600w. Not because you Need it, but because of:

- a PSU has it's best efficiency at 50-60% load. So: 600w PSU is most efficient, if the Computer draws like 300-350 Watt, maybe <400 Watt)

- To have some breathing room for the Future. Who knows what your next GPU / CPU might be.

 

 

Oh yea, i mentioned a GTX 1080 doesn't run very efficient (like almost every other GPU). here's something nice:

I undervolted mine to 0.800 Volt (instead 1,05 Volt), 

and downclocked it according to that to 1823 Mhz (instead 1963 Mhz).

But i Overclocked the Memory from 5000 Mhz to 5500 Mhz.

 

Total Performance Loss maybe 0-5%. I never notice anything ever, beause i have G-Sync.

 

my GTX 1080 power consumption went form 220w down to 140w~.

 

My whole Computer draws <240-250 Watt out of the Wall during Gaming. Making it a total Power consumption of about 220-230 Watt at best.


___________________

TL;DR: 

If you undervolt, your Computer will be at 250~ Watt powerdraw, +- 20.

 

If you don't touch your GPU, and don't use one of the "higher powerdraw" models, but more one of the "normal TDP" models, it should be below 350 Watt.

So, minimum a good 400-450 Watt PSU is enough. 500w would be better because of some breathing Room.

 

You can't go wrong with a dec ent/good 500-600w PSU. Even if 450w would work perfectly fine too.

[Mick Naughty]

When it lists its recommendation, it normally has the specs of the cpu ran with it. Which is normally low end. 
Id just get a quality unit that doesn’t need adapters for the card and can support everything you have. I don’t go lower than 650 myself. 

[mathijs727]

I'm currently running the RM550x with a GTX1080 (and AMD 3900X CPU) and it's fine.

Except for extreme overclocking you should not be running into any issues.

 

I did check with a power meter once and it showed like 250W of total system power usage so I'm not worried at all.