RTX 30 series what power supply do you need for the RTX 3090, 3080, and 3070

Written by Stuart Thomas on Tue, Sep 8, 2020 8:00 PM

Nvidia’s next-gen RTX 30 series graphics cards are nearly upon us, launching in just over a week’s time (at least for the RTX 3080 that is) this has obviously gotten a lot of us excited to upgrade our PC hardware in time for the next-gen consoles and games. But what power supply do you need for the RTX 3090, 3080, and 3070?

Seasonic have previously confirmed that they recommend an 850W PSU for the RTX 30 series, which got a lot of people worried about needing to buy a brand new power supply for their system. Fear not though, as the RTX 30 series is a little bit less demanding than that at least.

Here’s a breakdown of each RTX 30 series GPU and their Thermal Power Specs:

GPU Max temp (in C) Power connectors TDP
RTX 3090 93 2x PCIe 8-pin 350W
RTX 3080 93 2x PCIe 8-pin 320W
RTX 3070 93 1x PCIe 8-pin 220W

(*Note: The specs listed above are based on the Nvidia Founders Edition graphics cards, as such certain custom AIB partners may have different specs per GPU, so check their official specifications if you were thinking of going with another brand)

This is obviously one of the most demanding generations of GPUs in terms of power draw, with both the RTX 3090 and RTX 3080 breaking past 300W. Now obviously that means more power is going to need to be distributed across your system, which may require a larger PSU than the one you already own.

A 550W-650W power supply is fairly standard these days, especially after the previous-gen RTX 20 series GPUs came out 2 years ago. But the new RTX 30 series recommends at minimum a 650W power supply for the RTX 3070.

The RTX 3080 on the other hand is recommended to have a 750W PSU, just 100W shy of the previous leaks by Seasonic. Surprisingly, the monster 8K 60fps RTX 3090 graphics card doesn’t actually require anything bigger than a 750W power supply either.

RTX 3090 recommended power supply size

The top-end RTX 3090 has a power draw of 350W, making it one of the most demanding GPUs in terms of power draw. For the Nvidia’s Founders Edition you will need a 750W power supply in order to provide sufficient power, though Nvidia also states that a lower PSU rating could work, though that depends on your system configuration. If you are looking to use a lower power rating, then it is recommended you check with your PSU vendor.

You will also need 2 dedicated 8-pin PCIe power cables running from the PSU separately. If you purchase the RTX 3090 Founders Edition then these cables will be supplied for you.

Additionally, though not related to your PSU size, the RTX 3090 comes in at 12.3 inches (313mm) in length, 5.4 inches (138mm) in width, and will require 3 expansion slots on your PC case. So make sure you have enough space in your PC case in order to install this graphics card.

If you’re not sure what PC case to pick, here’s our own guide to the best PC cases for the RTX 3090 and the rest of the RTX 30 series including the RTX 3080 and RTX 3070.

RTX 3080 recommended power supply size

The flagship GPU of this new generation, the RTX 3080, has a total power draw of 320W which makes it a pretty hefty and demanding card. According to Nvidia, you will need a power supply rated at 750W in order to run properly. Once again though, Nvidia has stated that a lower power rating could still work depending on your system configuration, but its recommended to check with your PSU vendor first whether the lower-rated PSU supports the RTX 3080.

The RTX 3080 also requires two dedicated 8-pin PCIe power cables running sperataley from the PSU. The RTX 3080 Founders Edition will come packaged already with these 2 cables provided.

In addition, the RTX 3080 has a length of 11.2 inches (285mm) and a width of 4.4 inches (112mm), though unlike the RTX 3090 above, this card will only take up 2 expansion slots in your PC case.

RTX 3070 recommended power supply size

The RTX 3070 is probably one of the most exciting cards of this generation due to its performance improvements for the price, and comes in at a much lower 220W power draw. For this card you will need a lower rated 650W power supply. Nvidia hasn’t provided quite the same handy infographics as the two cards above, but provides the same information in the specs list at least.

The RTX 3070 may also work on a lower-rated PSU than 650W, though once again this does depend on your own system’s configuration. If you are looking to use a lower rated power supply then its recommended you check with your PSU vendor for RTX 3070 compatibility. 

The RTX 3070 requires a single 8-pin PCIe power connector running from the PSU, and a suitable cable will come bundled with the RTX 3070 Founders Edition.

The RTX 3070 is detailed as 9.5 inches (242mm) in length and 4.4 inches (112mm) width. Like the RTX 3080 above this GPU will only require the standard 2 expansion slots in your PC case.

RTX 30 series power draw and recommended PSU size breakdown:

GPU GPU Power Draw Recommended PSU size
RTX 3090 350W 750W
RTX 3080 320W 750W
RTX 3070 220W 650W

Power supply quality ratings and power supply efficiency

Of course, in the world of PC hardware, getting a sufficient PSU size is not all you have to think about. Instead, you must also think about the quality and efficiency of your power supply. This is where PSU efficiency ratings come in.

The efficiency of your PSU is just as important as the power rating, as it determines the amount of power that gets drawn from your wall socket and converted into power to distribute among your PC system. A 50% efficiency rating will mean that a 300W PSU will draw 600W from your wall socket in order to provide enough power. However, efficiency is affected by a range of factors, including the amount of load on the PSU itself.

So what is a good power supply efficiency? Well, whilst you can really get any power supply you want, an 80 Plus certification is highly recommended due to its relatively low-cost premiums and benefits. An 80 Plus certification just means that the PSU will be at least 80% efficient when at loads of 20%, 50%, and 100%.

As an example, this means that the same 300W PSU we used as an example before would only draw a maximum of 375W from your wall, which is a pretty significant drop from the 600W calculated before.

Okay, but why does efficiency matter? Well, if you are energy-conscious then the higher the efficiency the better, as this means less power will be drawn from your wall socket. Additionally, lower efficiency types will produce a lot more heat within your system (as more energy gets wasted during AC to DC conversion), which in turn will use your fan more often. So if you want a quieter PC then you’ll also want a higher efficiency rating.

Lastly, a higher efficiency will mean a safer PC build as well. Generally, it's fine to use non-80 Plus certified PSU sizes in terms of safety, but if you want to be extra safe then you’ll want to stick to those certifications.

Okay so now that’s everything right? Well no, there’s actually one more thing. The 80 Plus certification actually comes in different tiers to determine how efficient certain PSUs actually are. The standard 80 Plus rating (also known as 80 Plus White) for instance will get you that par 80% efficiency across all types of loads.

There’s also 80 Plus Bronze, 80 Plus Silver, 80 Plus Gold, 80 Plus Platinum, and 80 Plus Titanium. Each of these tiers come with slightly better efficiency ratings at each load. A breakdown of each 80 Plus certification tiers and their efficiency ratings can be seen below:

Load 80 Plus 80 Plus Bronze 80 Plus Silver 80 Plus Gold 80 Plus Platinum 80 Plus Titanium
20% 80% 82% 85% 87% 90% 92%
50% 80% 85% 88% 90% 92% 94%
100% 80% 82% 85% 87% 89% 90%

Now the numbers may seem like a significant upgrade from each other, but in the end there’s not a whole lot of difference between 80 Plus Bronze and 80 Plus Titanium. Whilst there will be some benefits choosing the higher tier Titanium grade, the difference is marginal. You will definitely save money on your energy bill but only by a few dollars at most on average. 

In terms of safety, there’s nothing dangerous or risky about getting an 80 Plus Bronze certified PSU compared to a Titanium one, but the 80 Plus Titanium will indeed be just a little bit more reliable.

Best PSU for RTX 30 series including RTX 3090, RTX 3080, and RTX 3070:

PSU Form Factor PSU Capacity Efficiency Rating Price (USD$)
Corsair RM850x ATX 850W 80 Plus Gold 130
Cooler Master MasterWatt 750W ATX 750W 80 Plus Bronze 90
Corsair AX1000 ATX 1000W 80 Plus Titanium 400
Corsair AX1600i ATX 1600W 80 Plus Titanium 700
Corsair RM750x ATX 750W 80 Plus Gold 200
Thermaltake Smart RGB 700W ATX 700W 80 Plus 80

So that’s it on power supplies and PSU efficiency ratings, now you will hopefully be able to choose the perfect power supply for you to pair with the RTX 30 series GPUs like the RTX 3090, RTX 3080, or RTX 3070.

What do you think? Are you excited for the RTX 30 series GPUs? Will you need to upgrade your PSU size? Which one are you thinking of getting? Let us know!

Will you be upgrading your PSU size?

What PSU rating do you normally get?

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06:16 Sep-18-2020

GTX 980 had an 165W TDP. GTX 1080 had an 180W TDP. RTX 2080 had a 215W TDP. RTX 3080 is all the way up to a 320W TDP? You mean to tell me that we waited two years, performance went up about 25%, and power consumption went up about 50%? Is Nvidia joking?

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23:35 Sep-16-2020

I personally have a Thermatake smart 650 watt because my corsair 550 watt blew. 3070 or less 650 is perfectly fine me thinks!

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12:49 Sep-10-2020

speaking of power supplies, I'd say most important and useful spec when building a matching psu+gpu combo is to look at graphics card manufacturer website of exact model you intend to buy and note the required/recommended AMPERAGE, it often happens to be more limiting factor than wattage, especially with some psus having split power lanes;
about the card dimensions, I checked how's my ASUS STRIX 1080 Ti and surprisingly it's just a little smaller (29.8 x 13.4 x 5.25 cm) than RTX 3090 - that said, I thought mine's already huge, so I'm really curious if there'll be 3.5 or 4-slot aftermaket models of 3090

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09:39 Sep-10-2020

Some of the AIB versions even have 3x8 pins listed in the requirements? Whaaaat. (3080 Gigabyte Aorus Extreme)

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21:30 Sep-09-2020

So my thermaltake 80 plus white 600w is enough for an rtx 3070?

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20:05 Sep-10-2020

Depends on other components, since nVidia recommendation has to keep worst cases in mind, which likely is i9 with MCE enabled. But in general, if you will do calculations, probably closest in consumption will be 2080Ti, which is like 30W more. So I think it should be doable with R7 2700, as long as you don't push overclocks too much. At least that would be my guess.

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17:02 Sep-09-2020

i have a Seasonic M12II EVO, will it be enough for an 3070? or the AMD equivalent?

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18:01 Sep-09-2020

Under full synthetic CPU and GPU load my 620w unit suckes down about 400w from the wall you should be just fine

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15:58 Sep-09-2020

I've got enough juice but not enough connectors

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12:30 Sep-09-2020

I'm about to piss a lot of people off.... is sli still useful and are there any benefits for doing so via 3080 or 90 x 2?
I'm truly curious about this.

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13:42 Sep-09-2020

i think only the 3090 can sli.. they're slowly killing it off.. most would tell you it's already dead

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12:08 Sep-09-2020

I doubt it'll need 750w PSU we'll know for sure when reviews are released
I was thinking to get SF600 platinum a sfx PSU from corsair, platinum for quieter operation and better cables otherwise gold should be enough

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10:57 Sep-09-2020

My Corsair AX850 Professional Gold will handle the 3080 just fine :D

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08:54 Sep-09-2020

I'll be sticking up with my Corsair TX650M 80+ Gold for RTX 3070 I guess. That's good news for me ;)

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07:14 Sep-09-2020

Well, I have a Seasonic G-650W 80+ Gold with a GTX Asus 980 Poseidon wich is already 300W consomption... 20W more for the 3080 should be fine! Right right?

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02:40 Sep-09-2020

I think my seasonic prime tx is going to be fine

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00:25 Sep-09-2020

Soo what if I had a Seasonic prime Titanium 80 Plus 650 watt ? I would think a 3080 would work fine with it.

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05:46 Sep-09-2020

Yeah, i think that a good quality 650w psu would work. For example my pc, while playing gpu intensive games, takes around 380w and 3080 should take 100w more

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22:42 Sep-08-2020

I got 650W gold rated PSU and I am definitely not thinking about upgrading beyond 3070, so I am fine. But yeah, seems like new cards will definitely bring 750W PSUs back into desktop game, since nVidia went all out on power, rather than being super efficient like they got with Maxwell and Pascal. Anything above 650W for desktop was overkill for a while.

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22:27 Sep-08-2020

I bought 750W seasonic focus gold 80+ in March of this year. I think it's more than enough for 30xx series, but I'm not buying one just yet. No need for it really, my 5700xt doing just great.

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21:59 Sep-08-2020

I had a GTX 770, which is a 230W GPU on my 630W 80+ PSU, and it ran fine, i don't think i need anything better for 3070, if i actually decide to get one. I'm still curious to what AMD has to offer, and the 3060 might be an even better deal overall.

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21:10 Sep-08-2020

Personally I don't care one bit about power supply ratings.


As long as it has enough power to do the job that is literally all that matters to me.

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21:26 Sep-08-2020

keep in mind efficiency rating usually correlates with psu quality, the higher the rating the better the psu (meaning it'll probably last longer and cause less problems). Also bad quality psus can damage other components in the system which is another reason to get a decent unit. As always, best to check reviews before buying

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02:17 Sep-09-2020

Also PSU problems are one of the hardest things to trouble shoot. The issues can be so random and it will frustrate you before you realize it is the PSU.

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20:50 Sep-08-2020

i have 700w on my r5 3600 and gtx 960. i think im safe if i go with 3070 lol.

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20:16 Sep-08-2020

I have a 620w bronze seasonic M12II EVO i wouldnt be nervous sticking a 3080 in it. I would still first want to see benchmarked power draw numbers before people start buying up the last remaining PSU on the market.

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| 30FPS, Low, 1080p
Core i5-7300HQ 4-Core 2.5GHz GeForce GTX 1050M Ti 4GB 12GB
Core i7-10750H 6-Core 2.60GHz GeForce RTX 2060 Mobile 16GB
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