Is 550W PSU enough for GTX1080ti

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Zaporro

Zaporro

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Im planning to put together this build:

i7-8700k (when it's released hurr durr)
GTX1080Ti (EVGA FTW3)
Corsair AIO liquid cooling (probably H115i)
32GB ram
one 2560x1440 and one 1920x1080 screens

Is 550W enough for it (ill be picking something from seasonic G series or XFX core/pro, need to take a look at PSU Tier list again) or should i get 600W (hard to find something like that) or 650W?



 
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turkey3_scratch
I would advise to ignore PSU calculators as well as recommendations from AMD/Nvidia for power supplies for their GPUs. They don't know what your system specs are, and they try to take into account piece of crap PSUs. PSU companies also very likely have Nvidia and AMD in their pockets.

For the OP's system specs there, a 550W PSU is perfectly fine. The only way it would be pushed is with some very very heavy overclocking, like really big. I don't see it even being possible. An overclocked 1080Ti could get near 300W, and adding in an OC 8700K when it's out and rest of system, you're looking at a load of around 450W with an all very heavily overclocked system.
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10tacle

10tacle

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A good Tier 2 or Tier 1 550W will be fine. The only reason you'd want more wattage is if you plan on going 1080 Ti SLI down the road for 4K or something. FYI for now, stay away from the EVGA G3 series. There are some potential issues going on with that line that has been reported. If you can find an EVGA SuperNova G2 out there, that will be okay. For now, there are some unanswered questions about the G3 series in a Tom's review of their 450W variant and upcoming other G3 review:

http://www.tomshardware.com/reviews/evga-450-b3-psu,5160.html
 
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10tacle

10tacle

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In this example of a FTW3 1080 Ti test, they drew 407W from the wall under load running a Unigine Heaven bench, which would be about 75% of a 550W capability. Their hardware was an i7 6700K using an EK L360 liquid cooler.

https://www.bjorn3d.com/2017/05/evga-geforce-gtx-1080-ti-ftw3-gaming-review-unleash-the-beast11g-p4-6696-kr/5/
 
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aquielisunari

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I go over here https://www.newegg.com/Product/Product.aspx?Item=N82E16814487338 and see 600 Watts or greater power supply.
PCI Express, PCI Express 2.0 or PCI Express 3.0 compliant motherboard with one graphics slot.

The manufacturer does pad their requirements. However I wouldn't buy a PSU with JUST enough power.

https://www.newegg.com/Product/Product.aspx?Item=N82E16817438083&cm_re=650W_G2-_-17-438-083-_-Product OR
https://www.newegg.com/Product/Product.aspx?Item=N82E16817438054&cm_re=650W_G2-_-17-438-054-_-Product

If you opt for the refurbished G2(which I would) I would also buy the 2 year protection plan. Make sure you KNOW what kind of protection that offers, when the protection begins, what it doesn't protect against and what your responsibilities are.
 
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Zerk2012

Zerk2012

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407 from the wall means the PSU was pushing about 350 watts not 407.
87% to get gold rating meaning for ever 100 watts from the watt it's putting out 87 watts of its rated capacity.
 
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Zerk2012

Zerk2012

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That also means nothing because they have no clue what the rest of your PC parts are.
 
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Zerk2012

Zerk2012

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Get the Seasonic G 650 watt model I have that in my PC and then you have plenty of power even for overclocking..
 
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feelinfroggy777

feelinfroggy777

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Yes, it means something, a lot actually. To quote: "Minimum of 600 W or greater power supply". So that is the minimum Nvidia suggest, regardless of the system. The OPs question was is 550 enough? Not according to Nvidia its not.

For a top end system that's sole purpose if for high performance, why would we go with a PSU that is below the minimum requirements?

But you are right Nvidia does not know the system requirements and neither do we. This entire conversation is hypothetical because the OP is including a CPU that has not been released or tested. All we have seen is a box. Considering this CPU is the first of its kind for Intel mainstream CPUs, we really don't have a similar chip to compare it too. With 2 more cores and 4 more threads than the 7700k, I would think that the power draw would be more than the 7700k, especially overclocked.

It would be foolish to spend $1500 on a system and get a PSU below the minimum 600 watts that Nvidia recommends.
 
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Zerk2012

Zerk2012

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Actually no it means absolutely nothing. If I had a 65 watt processor and one drive I would not need 600 watts.
If I had one of the massive 220 watt AMD processors then it would not even be enough.
They have no clue what the rest of your PC is and you can buy a 600 Watt power supply that will pop if you draw close to 400 watts from it.
The only thing they should state is the TDP of the card nothing else.
95 watt processor and the Seasonic G 650 Watt I suggested above covers it all.
https://www.pcgamesn.com/intel/intel-14nm-coffee-lake-release-date/#specs
 
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feelinfroggy777

feelinfroggy777

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Times like these I just quote The Dude "that's just like your opinion man".
 
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turkey3_scratch

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I would advise to ignore PSU calculators as well as recommendations from AMD/Nvidia for power supplies for their GPUs. They don't know what your system specs are, and they try to take into account piece of crap PSUs. PSU companies also very likely have Nvidia and AMD in their pockets.

For the OP's system specs there, a 550W PSU is perfectly fine. The only way it would be pushed is with some very very heavy overclocking, like really big. I don't see it even being possible. An overclocked 1080Ti could get near 300W, and adding in an OC 8700K when it's out and rest of system, you're looking at a load of around 450W with an all very heavily overclocked system.
 
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turkey3_scratch

turkey3_scratch

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HardOCP has an overclocked 1080Ti Lightning and a 5Ghz 7700K. They got 502W from the wall with this https://www.hardocp.com/article/2017/07/24/msi_geforce_gtx_1080_ti_lightning_z_video_card_review/10

PSU is a Corsair CX850M. Going by this most likely efficiency is 86%. So that is 430W. That's with the GPU overclocked and CPU heavily, too.



I don't know why you wouldn't get something better than those, because IMO they're all poor options. I'd say the first mistake is only using the Tomshardware tier list, it's severely outdated, and you're looking to pick all old units that are out of production or replaced by now. The G Series units can get loud under higher loads and are replaced by the Focus + now. They also don't have the best protections compared to some other units. And XFX has fallen off the face of the earth with power supplies.

The rest of your hardware is so much money, you should be spending a little more on the PSU. Just $15 more could get you something vastly superior to your predefined choices.
 
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Zaporro

Zaporro

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Yeah i took a look and started checking names and half of them are unavaliable anymore. There are brand new evga supernova G2 available here, i was looking at Seasonic Focus Plus Gold too or Seasonic Prime (both of these are priced about same). At that price range there are also Corsair RMx series and XFX Black series.
 
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