Best Power Supply (PSU) for Mining Cryptocurrency in 2021

10 Mins read

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Although it’s quite common to think that a GPU-based mining rig requires huge amounts of electricity to operate, there is lot of misinformation circulating online regarding this topic. It’s true that mining rigs need a lot of power to work, and it’s also true that power supply is one of the most important components in a mining machine, however, in order to efficiently mine Ethereum (ETC) or Monero (XMR) cryptocurrencies, you don’t really need to have a monstrous 2000 W power supply.

A lot of people on cryptocurrency forums post misleading information and lies about how powerful your mining PSU should be. Some of them even say you may need to purchase multiple power supplies in order to power your mining rig. Most of this information is not true, and in fact, is a matter of simple math which everyone can do. Here is why.

Read more: The Best PCI-E Riser Cables for Cryptocurrency Mining in 2021

You see, there are two important things that you need to consider when buying a PSU for your new mining rig. Firstly, mining doesn’t consume all of your system’s resources, nor it uses the full capacity of your graphics card. GPUs are primarily designed for gaming, and they feature various components that are unnecessary for mining. This means that only GPU cores are busy running mining calculations, while other components are idle most of the time.

Secondly, graphics cards, unlike CPUs, perform just as good when they are underclocked or undervolted. Some graphics cards can be underclocked as much as 200 MHz, and their power levels can be reduced up to 60% depending on the model. What this means is that a mining rig featuring six GPUs that is rated at 1200 watts of power consumption will actually consume only about 600 watts of power.

Which Power Supply Should I Get?

Before you decide to purchase a power supply for your mining rig, you need to determine the total amount of wattage your mining system will draw. To do that, all you have to do is sum up the wattage of all of your system’s components. You will probably get a big number, however, keep in mind that this represents the maximum theoretical load of your system, which in reality will probably never occur. Now, add in the equation the fact that your CPU will most of the time run in an idle state, and that your undervolted or underclocked graphics cards will consume 10-60% less power depending on the model.

Having an oversized power supply, however, does have some benefits. PSUs usually work best at about 80% load. This enables them to slow down their fans, and generate less heat waste. So overall, if your system consumes around 800 watts under full load, then a 1000 watt power supply should be more than good enough.

If you plan to build a mining rig, then we recommend getting a modular power supply. This will save you the hassle with cables, and will allow you to comfortably connect all of your system’s components, and remove unused cables that you don’t need. Lastly, if you aim to be a professional miner, then you should get yourself a smart power supply. These PSUs usually have integrated circuits that allow you to remotely monitor your system’s power consumption and voltages in real-time.

With all that said, let’s now take a look at the best mining power supplies you can get in 2021. Some of them which we are about to show you are better optimized for heavy-duty workloads, while some of them are even well-suited for high-end gaming PCs.

Best Overall: Corsair HX Series HX1200

Form Factor: ATX | Power: 1200 W | Efficiency rating: 80 PLUS Platinum Certified | Modularity: Modular

  • Very powerful
  • High-quality capacitors
  • Zero RPM fan mode
  • 10-year warranty
  • Lacks Smart features

The Corsair HX1200i is probably one of the best power supplies which can be used in a mining rig. This 80 PLUS Platinum certified PSU can boast with an extremely tight voltage control, very quiet working operation, and fully modular cable set. The HX1200 is a great choice for high-performance PCs where reliability is essential, and operating costs have to be reduced as much as possible.

This PSU can also boast with Zero RPM fan mode, support for 8 PCIe connectors, and MTBF of 100,00 hours. Although it doesn’t feature any Smart capabilities which allow you to remotely monitor its performance, this is one of the best PSUs for building a powerful mining rig, as it can deliver up to 100 amps of power on a single +12V rail, and is backed by a hefty 10-year warranty.

Best 1600 W PSU: Corsair AXi Series AX1600i

Form Factor: ATX | Power: 1600 W | Efficiency rating: 80 PLUS Titanium Certified | Modularity: Modular

  • Insanely powerful
  • Can deliver 133 amps on a single rail
  • 80 PLUS Titanium certified
  • Fully modular
  • Large and heavy
  • Expensive price

Designed for workstation and high-performance PCs, the Corsair AX1600i PSU is the ultimate tool to eliminate all system bottlenecks and achieve unrivaled performance. This Titanium certified PSU features fully modular design, state-of-the-art gallium nitride transistors, 100% Japanese electrolytic capacitors, and multiple voltage and circuit protections. It is also probably one of the most powerful PSUs currently available on the market, as it’s able to deliver 1600 watts of continuous power delivery with up to 94% efficiency. The Corsair AX1600i can also boast with the fact that it can deliver up to 133 amps on a single 12V rail, which makes it a perfect PSU for powering systems that use a lot of video cards (e.g. mining rigs, distributed computing systems or rendering workstations).

Best 1500 W PSU: Silverstone Tek ST1500 80+ Silver

Form Factor: ATX | Power: 1500 W | Efficiency rating: 80 PLUS Silver Certified | Modularity: Modular

  • Very powerful
  • Can deliver 120A on a +12V rail
  • Features ultra-quiet 135 mm fan
  • Optimized for multi-GPU builds
  • Huge dimensions
  • Doesn’t have on/off switch

Despite featuring 80 PLUS Silver certification, the Silverstone ST1500 is a highly reliable and robust power supply unit that is able to deliver 1500 W of continuous power output, as well as 1600 W of peak power output. Thanks to its high-quality components, this PSU can deliver stable performance and unbeatable efficiency for your high-end workstation PC, or an Ethereum mining rig.

The Silverstone ST1500 can also boast with fully modular design, ultra-quiet 135 mm fan, and support for up to 8 GPUs. With an MTBF of 100,00 hours, this is also one of the more reliable PSUs on the market, and also one of the most powerful, as it can deliver up to 120 amps of power over its +12V rail. Another great thing about this PSU is that it was built with SLI/CrossFire GPU configurations in mind, so the whole process of installing the PSU and hooking up the cables to your GPUs is extremely easy. The only major flaw of this PSU, besides its huge dimensions, is the fact that it lacks on/off switch.

Best 1300 W PSU: EVGA SuperNOVA 1300 G+

Form Factor: ATX | Power: 1300 W | Efficiency rating: 80 PLUS Gold Certified | Modularity: Modular

  • EVGA 10-year warranty
  • High-quality components
  • Can deliver 108 amps on +12V rail
  • Features advanced DC-DC converter
  • Lacks Smart monitoring capabilities

The EVGA SuperNOVA 1300 G+ is an affordable high-performance power supply that will best suit various cryptocurrency miners, workstation professionals, and PC enthusiasts. This 1300 W PSU features fully modular design, variable resistor module, two DC to DC modules, a full suite of protections, and it comes with a 10-year warranty. The fan on this power supply comes with fluid dynamic bearings which reduce the fan’s wear and tear, as well decrease overall noise. Thanks to its high-quality capacitors and premium components, this PSU can deliver up to 108 amps on single +12V rail. The SuperNOVA 1300 G+ can simultaneously power up to six GPUs, and the only thing we don’t like about this PSU is that it lacks Smart monitoring features.

Best 1200 W PSU: Thermaltake Toughpower iRGB Plus 1200W Platinum

Form Factor: ATX | Power: 1200 W | Efficiency rating: 80 PLUS Platinum Certified | Modularity: Modular

  • Features patented RGB lighting
  • Advanced PFC & LLC controllers
  • Supports up to 8 GPUs
  • Cloud monitoring software
  • Buggy software

Buying a PSU with RGB lighting for your cryptocurrency mining rig may seem like a waste of money, however, the Thermaltake Toughpower iRGB Plus 1200W 80+ Platinum power supply unit is an exception. Besides the fact that this one of the very few PSUs featuring a pre-installed patented RGB fan, the Toughpower iRGB is also packed with lots of high-tech components which make it perfect for building a reliable and powerful mining rig.

This PSU comes with an all new circuit design with PFC & LLC digital controllers, has a highly efficient RGB fan blade designed for high static pressure requirements, and features an extremely strict voltage regulation compared to other PSUs. Besides all that, this PSU also features smart capabilities, which means you can monitor its performance in real time through a mobile app, or cloud management system. The Toughpower iRGB can also boast with the fact that it can deliver up to 100 amps of power on +12V rail, which is one of the main reasons why this is one of the best PSUs for serious mining professionals.

Best 1000 W PSU: Seasonic FOCUS Plus 1000 Gold

Form Factor: ATX | Power: 1000 W | Efficiency rating: 80 PLUS Gold Certified | Modularity: Modular

  • Great value
  • Three-phased thermal control
  • Physical fan control button
  • 10-year warranty
  • Can power only up to four video cards

Seasonic has been widely known as an industry leader in producing high-performance PC power supplies. The FOCUS Plus Gold 1000 model is no exception in that regard, as this 80 PLUS Gold certified power supply unit is able to deliver great performance alongside 10-year warranty. The FOCUS Plus Gold 1000 features fully modular design, and is able to offer 90% efficiency at 50% system load.

This PSU also comes with three-phased thermal control, and it has physical fan control button which allows you to toggle the active fan working modes. The FOCUS Plus Gold 1000 can deliver up to 83 A on +12V rail, and can power up to four GPUs. Overall, this is a very reliable and straightforward PSU that is able to deliver enough power to high-performance systems for an affordable amount of money.

Best 850 W PSU: EVGA SuperNOVA 850 G5

Form Factor: ATX | Power: 850 W | Efficiency rating: 80 PLUS Gold Certified | Modularity: Modular

  • High-quality components
  • Great reliability
  • ECO mode
  • Very quiet fan operation
  • Can power up only 4 GPUs
  • Sometimes exhibits coil whine

The SuperNOVA 850 G5 is yet another power supply from EVGA on our list of the best mining PSUs. You may ask yourself why’s that? Well, the answer is quite simple. EVGA’s power supplies simply offer the best price-to-performance ratio, and as such are perfect for powering cryptocurrency mining rigs.

The SuperNOVA G5 is a successor to the award-winning G3 series, and like its predecessor, it’s able to push the envelope with the latest certifications and Intel power-on standards. The G5 features 100% Japanese capacitors, ultra-quiet 135 mm fluid dynamic bearing fan, energy-optimized ECO mode, and 80 PLUS Gold certification. This PSU can power up to four GPUs simultaneously, and can deliver up to 71 A of electric current on +12V rail with 91% efficiency. Provided that you need a cheap, reliable, and fairly capable PSU, then SuperNOVA 850 G5 is the best choice for you.

Best 750 W PSU: Corsair RMX Series RM750x

Form Factor: ATX | Power: 750 W | Efficiency rating: 80 PLUS Gold Certified | Modularity: Modular

  • Compact dimensions
  • Very quiet operation
  • Low heat waste production
  • Good reliability
  • Could be cheaper
  • Too weak for serious mining rig
  • Power delivery could be better on +12V rail

The 750 W power supply unit probably offers the bare minimum to power any serious mining rig. Such a PSU can barely support single NVIDIA GeForce RTX 3080 graphics card, let alone three or four more GPUs. This kind of PSU could probably prove most useful to miners who have a couple of low-powered AMD Radeon RX 580 or RX 570 GPUs, and have a weak quad-core CPU installed in their rig. The Corsair RMX Series RM750x seems like a perfect PSU for this kind of setup, as it features 80 PLUS Gold certification, fully modular design, and can deliver up to 62 amps on +12V rail.

This PSU can also boast with virtually silent operation, very low heat waste production, and good reliability. The RM750x can power up to four GPUs, and can be fit into almost any case due to its compact size. The price of this PSU could be cheaper, but given that is made by Corsair, it’s not too surprising to see it retail at price of around $135.


In order to efficiently mine cryptocurrencies, you don’t need to have an immensely powerful PSU. If you undervolt or underclock your GPUs, you can expect to reduce your overall system consumption by up to 60%. However, it all comes down to the number of GPUs you plan to use in your mining rig. If you’ll be using more than six GPUs, then power supply units with more than 1400 watts of power should provide enough electricity to your system. If your mining rig will feature four to six GPUs, then getting a 1000 W or 1200 W PSU is the best way to go. We hope our buying guide helped you in search for the information you were looking for. If you still feel confused, and need advice about buying, feel free to post a comment below. We will try to help you.

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About author
Before he joined ViCadia, Nicholas worked as a journalist for several tech magazines. Over the years he gained a lot of knowledge about computers. His main area of interest are processors, motherboards, and operating systems.
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