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Every PC runs on the best power supply unit. It takes AC power from the wall and turns it into low-voltage DC power, which then powers all your devices. So, you need a good power supply if you want your motherboard, CPU, RAM, graphics cards, drives, fans, and RGB lights to get steady, reliable power. If you don’t, you’ll have stability problems quickly, and your computer will shut down on its own.
When building a PC, there are a lot of things to think about when choosing the power plant. There’s a lot to think about here, from wattage and efficiency to modularity. Luckily, we’ve done all the research for you. We’ve chosen the best power supplies on the market today, from cheap ones to ones that are so powerful they can run two systems at once.
Best Power Supply Comparison Table
Model | Voltage | Manufacturer | Dimensions | Weight | Price |
---|---|---|---|---|---|
Corsair RM750x | 100-240V | Corsair | 160 x 150 x 86 mm | 1.93 kg | $129.99 USD |
Seasonic Prime Titanium TX-1000 | 100-240V | Seasonic | 190 x 150 x 86 mm | 2.54 kg | $399.99 USD |
Corsair CX650M | 100-240V | Corsair | 150 x 140 x 86 mm | 1.8 kg | $79.99 USD |
Cooler Master V850 | 100-240V | Cooler Master | 160 x 150 x 86 mm | 2.01 kg | $169.99 USD |
Seasonic FOCUS GX-550 | 100-240V | Seasonic | 140 x 150 x 86 mm | 1.25 kg | $89.99 USD |
FSP Dagger Pro | 100-240V | FSP | 125 x 63.5 x 160 mm | 1.32 kg | $219.99 USD |
Gigabyte UD1000GM PG5 | 100-240V | Gigabyte | 180 x 150 x 86 mm | 2.8 kg | $329.99 USD |
Corsair RM850X | 100-240V | Corsair | 160 x 150 x 86 mm | 1.93 kg | $139.99 USD |
Corsair RM750x

Specification | |
---|---|
Power Output | 750 Watts |
Efficiency | 80+ Gold |
Modular | Fully |
Dimensions | 160mm x 150mm x 86mm |
Warranty | 10-year limited |
The RM750x is clear proof that Corsair’s RMx line is one of the best on the market because it combines high performance with reasonable prices. Even though there is a lot of competition, Corsair’s R&D manager Jon Gerow and his team of engineers are able to make products that keep raising the bar.
This CWT platform, which is only used by Corsair, is built to a very high standard. The capacitors on both the primary and secondary sides are made in Japan, and the magnetic levitation fan and the FETs should be able to last longer than the ten-year warranty.
The Good
- 750 watts is a lot of power.
- Excellent rating of 80 or more Gold
- Fully modular design makes it easy to keep track of cables
- Comes with a 10-year warranty, which is a lot.
The Bad
- Compared to other 750-watt power supplies, it may cost more.
Seasonic Prime Titanium TX-1000

Specification | |
---|---|
Power Output | 1000 Watts |
Efficiency | 80+ Titanium |
Modular | Fully |
Dimensions | 190mm x 150mm x 86mm |
Warranty | 12-year limited |
The Seasonic TX-1000 is a great power supply that is built very well. In addition to the great soldering, it has Japanese capacitors everywhere, including a lot of polymer capacitors and a fan with a fluid dynamic bearing. Engineers at Seasonic did their best to make sure that the fan was as efficient as possible in all load ranges, as well as quiet and reliable.
This PSU is in the top tier when it comes to performance because it has tight load regulation on all rails, great ripple suppression without the annoying in-line caps, and a great hold-up time. On top of that, the efficiency of the 5VSB rail is high, and the PSU gets some of the highest efficiency readings we’ve seen so far when the load is low.
The Good
- 1000 watts of power, which is a lot.
- 80+ rating for best efficiency in its class Titanium
- Fully modular design makes it easy to keep track of cables
- Comes with a long warranty of 12 years.
The Bad
- Costs more than other power supplies in the same category
Corsair CX650M

Specification | |
---|---|
Power Output | 650 Watts |
Efficiency | 80+ Bronze |
Modular | Semi |
Dimensions | 140mm x 150mm x 86mm |
Warranty | 5-year limited |
If you’re building a PC that doesn’t need a lot of power, you can get by with a power supply like the Corsair CX-M Series CX650M that has less wattage. You don’t get a fully modular PSU for $80, but it is semi-modular for a cleaner build, better cable management, and more airflow. It’s even 80 Plus Bronze certified, which gives you a guarantee that it will work well.
Even though it’s not an SFX model, the CX650M isn’t too loud and isn’t too big, but it can still pump out 650 watts. That much power should be enough for most mid-range builds. For example, you could use an AMD Ryzen 5 or Intel Core i5 processor and a graphics card like an RTX 3060.
The Good
- Affordable price point650 watts is a good amount of power.Semi-modular design gives you some freedom in how you manage cablesIncludes a 5-year guarantee
The Bad
- Fully modular designs may give you more freedom than semi-modular ones.
Cooler Master V850

Specification | |
---|---|
Power Output | 850 Watts |
Efficiency | 80+ Gold |
Modular | Fully |
Dimensions | 150mm x 140mm x 86mm |
Warranty | 10-year limited |
If you want to build in a mini ITX case, you don’t have to settle for a low-power system. The Cooler Master V850 power supply has all the juice you need to run a powerful system, but it comes in a small SFX form factor to fit into mini builds. The Cooler Master V850 is a fully modular power supply, so any of the cables can be switched out.
Cooler Master gives you cables with the package, but you can change them if you want a different style or need different lengths and shapes to fit inside your case. The power supply has an 80 Plus Gold efficiency rating and a fan with fluid dynamic bearings that makes it run more quietly.
The Good
- 850 watts of power is a lot.Gold rating of 80 or more for efficiency
- Fully modular design makes it easy to keep track of cables
- Includes a 10-year guarantee
The Bad
- Costs more than some other power supplies in the same category
Seasonic FOCUS GX-550

Specification | |
---|---|
Power Output | 550 Watts |
Efficiency | 80+ Gold |
Modular | Fully |
Dimensions | 140mm x 150mm x 86mm |
Warranty | 10-year limited |
Seasonic may not be the most well-known power supply brand, but it makes a lot of power supplies for well-known companies like NZXT. Seasonic’s mid-range line of power supplies is called the Focus series, and this 550W unit is more than enough for most PCs.
It is semi-modular, has an 80 Plus Gold rating, and gives all of your devices stable power. Even though it is semi-modular, Seasonic lets you choose which peripheral cables you want to use, as well as a PCIe cable if your GPU needs it. It’s a little pricey for an 80 Plus Gold PSU, but you shouldn’t overlook the quality of a Seasonic power supply.
The Good
- Good power for systems in the middle.
- Gold rating of 80 or more for efficiency
- Fully modular design makes it easy to keep track of cables
- Includes a 10-year guarantee
The Bad
- Compared to other 550-watt power supplies, it has a higher price.
FSP Dagger Pro

Specification | |
---|---|
Power Output | 650 Watts |
Efficiency | 80+ Gold |
Modular | Fully |
Dimensions | 125mm x 63.5mm x 100mm |
Warranty | 10-year limited |
FSP is a company that makes power supplies for other companies, such as be quiet! They make good power supplies that work well and give connected hardware clean, stable current. We really like the FSP Dagger Pro line of SFX units, which are made to work well in smaller PC builds.
This 650W model is fully modular, can handle a full gaming system, is rated 80 Plus Gold, comes with a seven-year warranty, and has a strong 12V rail. The fan can get a little loud when the computer is under a lot of stress, but it won’t be much louder than the other fans spinning inside the case.
The Good
- The small size makes it easy to fit into small form factor builds.
- 80+ Gold for high efficiency.
- Fully modular design makes it easy to keep track of cables
- Includes a 10-year guarantee
The Bad
- Compared to some other power supplies in the same category, it has less power output.
Gigabyte UD1000GM PG5

Specification | |
---|---|
Power Output | 1000 Watts |
Efficiency | 80+ Gold |
Modular | Fully |
Dimensions | 180mm x 150mm x 86mm |
Warranty | 10-year limited |
The Nvidia RTX 4000 range hasn’t reached the 1,000W limit yet, but we won’t know what the AMD RDNA 3 series needs until team red reveals the Radeon 7000 GPUs. If you don’t want your power supply to fall behind in the next few years, you might need a 1,000W monster like the Gigabyte UD1000GM PG5, which is ready for almost anything.
It already has support for the latest PCIe Gen 5 16-pin power connector, which will probably be used to power all GPUs in the future. The 120mm smart hydraulic bearing fan on the power supply, according to Gigabyte, should last 1.4 times longer than a standard sleeve bearing found on some cheaper models.
The Good
- 1000 watts is a lot of power.
- Good rating of 80 or more Gold
- Fully modular design makes it easy to keep track of cables
- Includes a 10-year guarantee
The Bad
- Compared to other 1000-watt power supplies, it may cost more.
Corsair RM850X

Specification | |
---|---|
Power Output | 850 Watts |
Efficiency | 80+ Gold |
Modular | Fully |
Dimensions | 160mm x 150mm x 86mm |
Warranty | 10-year limited |
The Corsair RM850X is a great power supply all around. It has good parts, a quiet fan, and a great build. It is fully modular, so you can use only the cables you need. This helps keep your case from getting cluttered with cables. It has six PCI-Express 6/8pin connectors, so even the most powerful graphics cards will have plenty of room.
There is no native support for the new 16-pin Nvidia power connector on its RTX 40-series cards, but you can use the adapter just fine. This model comes in different wattage capacities, up to 1,000W if you want to power high-end cards like an RTX 4090 with it, but you can easily run that with an 850W PSU.
The Good
- 850 watts of power is a lot.
- Gold rating of 80 or more for efficiency
- Fully modular design makes it easy to keep track of cables
- Includes a 10-year guarantee
The Bad
- 850-watt power supplies may be more expensive than others.
FAQs
What power supply is the best?
- Corsair CX450
- Corsair CX550F RGB
- Corsair RM550x
- XPG Core Reactor 650W
- Cooler Master V750 Gold V2
- EVGA SuperNOVA 850 G7
- MSI MEG Ai1000P PCIe 5
- Thermaltake Toughpower GF3 1350W
Is A 1000 watt power supply overkill?
No. It means that a 600W PSU will need about 1200W from the power supply it is plugged into to give its full output. 1000 watts is too much for a general consumer PC or a gaming PC that most people can buy. This means that 1000 watts is still too much, even when the RTX 3080 is used.
What power supply do I need for RTX 4080?
We suggest a power supply with 850W or even 1,000W. In this case, we’ve put together a list of the best power supplies for the RTX 4080 that you can buy. So, you will be able to run the RTX 4080 with a 750W PSU, but keep in mind that this is just the bare minimum for the GPU to work well.
Is 850 watt power supply overkill?
You can’t have a PSU that is too strong. The PSU is rated based on how much it can draw at its peak, not how much it always puts out. 850W is way too much, but when it comes to a PSU, more is always better.