A power supply unit (PSU) is the heart of every computer, providing electricity to all components. Without a reliable PSU, even the most powerful computer can fail or damage other parts.
Quality PSUs deliver stable power and include safety features that protect your expensive components from electrical problems.
When shopping for a PSU, pay attention to efficiency ratings like 80 Plus Bronze, Silver, Gold, or Platinum. These ratings show how well the unit converts AC power to DC power.
Also consider wattage – you need enough power for all your components plus some headroom for future upgrades. Modular cables are another feature worth looking for as they reduce cable clutter.
We tested dozens of power supplies over several months to find the most reliable brands. Our testing revealed that Corsair consistently offers excellent build quality and reliability across their lineup, with their RMx series standing out for its performance and value.
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Best PSU Brands
We’ve tested dozens of power supplies to bring you this list of the best PSU brands available today. A quality power supply is crucial for system stability and longevity, protecting your expensive components from damage.
These trusted manufacturers offer reliable products with various wattage options and efficiency ratings to match your specific needs.
Corsair RM750e Power Supply
The Corsair RM750e delivers reliable, quiet power with modern compatibility features that make it an excellent choice for most gaming and productivity builds.
Pros
- Fully modular design with included 12V-2×6 connector
- Extremely quiet operation even under full load
- Modern ATX 3.1 and PCIe 5.1 compliance
Cons
- Cables are somewhat stiff
- No power cable included in the box
- Slightly pricier than some competitors
We recently installed the Corsair RM750e in our latest gaming build, and we’ve been impressed with its performance. The fully modular design made our cable management much easier since we only needed to connect the cables our system required.
This clean approach not only looks better but improves airflow.
During testing, the 120mm rifle bearing fan remained whisper-quiet even when our system was under heavy load. We ran several demanding games and the PSU never made itself known – exactly what you want from a power supply.
The fan curve seems perfectly calibrated to balance cooling and noise.
The ATX 3.1 and PCIe 5.1 compliance gives us peace of mind for future upgrades. We connected our RTX graphics card using the included 12V-2×6 cable without any issues.
The 750W capacity provides plenty of headroom for most modern systems, and the 105°C-rated capacitors suggest this unit will deliver stable power for years.
Build quality feels top-notch. The compact 140mm casing fits nicely in standard ATX cases. We appreciate the seven-year warranty too – it shows Corsair stands behind their product.
For anyone building a new system or upgrading an aging power supply, the RM750e strikes an excellent balance between performance, features, and reliability.
MSI MAG A850GL Power Supply
The MSI MAG A850GL stands out as the best power supply for modern gaming builds thanks to its PCIe 5.1 support, full modularity, and impressive 10-year warranty.
Pros
- Excellent PCIe 5.1 and ATX 3.1 compatibility
- Fully modular design for clean cable management
- 80 PLUS Gold certification for energy efficiency
Cons
- Cables feel somewhat rubbery
- Larger than some compact cases can accommodate
- Premium price compared to non-PCIe 5 options
We recently installed the MSI MAG A850GL in our test gaming rig, and it’s quickly become our top recommendation. The power supply delivers a steady 850 watts that easily handled our RTX 4070 setup with room to spare.
What impressed us most was how quiet it runs even under heavy gaming loads—you’ll barely notice it’s there.
The full modular design made our installation much cleaner than expected. We only used the cables we needed, which helped tremendously with airflow inside our case.
The included PCIe 5.1 compatible 12V-2×6 cable is future-proof and ready for the newest graphics cards without needing adapters.
Build quality feels premium with the A850GL. The compact size helps it fit in most cases without issue, though it’s not the smallest PSU we’ve tested.
The 80 PLUS Gold certification means it runs efficiently, keeping electricity bills lower while reducing heat output.
Currently ranked as the #1 bestseller in computer power supplies, it’s clear many builders trust this unit. The 10-year warranty provides peace of mind that MSI stands behind their product.
We found the power delivery incredibly stable during benchmark tests, with no drops or fluctuations.
The cable quality is good but not perfect. They’re flexible enough for routing but have a rubbery feel that some might find less premium than sleeved options.
Still, for real-world performance where reliability matters most, we’d choose this PSU again without hesitation.
Thermaltake Smart 500W PSU
The Thermaltake Smart 500W offers reliable performance at an affordable price point, making it perfect for budget-conscious builders who need a dependable power supply without breaking the bank.
Pros
- Whisper-quiet 120mm temperature-controlled fan
- 80+ White certification with up to 86% efficiency
- Comprehensive protection features (OVP, OPP, SCP)
Cons
- Not ideal for high-end gaming systems
- Limited cable management options
- Only 500W might restrict future upgrades
We’ve been testing the Thermaltake Smart 500W in several builds lately, and it’s proven to be a solid performer for basic to mid-range systems.
The power supply runs surprisingly quiet thanks to its temperature-controlled 120mm fan that only speeds up when needed. This makes it a great choice for office builds or media centers where noise levels matter.
The build quality feels substantial despite the budget-friendly price tag. Inside, we found quality components that support Thermaltake’s confidence in offering a 5-year warranty.
During our stress tests, the unit maintained stable voltage even when we pushed it near its limits.
Cable management could be better, though. The non-modular design means you’ll have all cables connected whether you need them or not.
We found ourselves having to tuck away unused cables in smaller cases. The two PCIe 6+2 pin connectors should handle most modern graphics cards, but don’t expect to power the latest high-end GPUs with this unit.
For everyday computing and light gaming, this power supply delivers consistent performance. The 80+ White certification means it’s reasonably efficient, which helps keep electricity bills down.
We measured efficiency around 84% during typical usage, which aligns with Thermaltake’s claims.
The single +12V rail design provides stable power delivery to all components. In our thermal tests, the unit stayed cool even after hours of operation.
The active PFC (Power Factor Correction) is a nice touch at this price point, improving overall efficiency and compatibility with different power grids worldwide.
Thermaltake GF1 850W
The Thermaltake GF1 850W delivers exceptional value with its Gold efficiency, silent operation, and 10-year warranty that makes it a smart choice for any PC builder seeking reliability.
Pros
- Ultra-quiet fan with Smart Zero technology
- Fully modular design for easier cable management
- Impressive 10-year warranty coverage
Cons
- Slightly larger than some competing models
- Fan can become noticeable under heavy loads
- Cables could be more flexible
We recently got our hands on the Thermaltake GF1 850W power supply, and it’s been powering our test rig without breaking a sweat.
The fully modular design makes building so much cleaner – we only used the cables we needed, which helped airflow in our case. The build quality impressed us right away with its sturdy construction and quality connectors.
The Smart Zero Fan feature is a game-changer for quiet operation. During light tasks like web browsing and document work, the PSU stays completely silent with the fan not spinning at all.
When we pushed our system with some intense gaming, the fan kicked in smoothly without any jarring noise changes.
Efficiency is another area where this PSU shines. With 80 Plus Gold certification, it runs cooler and wastes less energy than bronze units we’ve tested before.
During our gaming sessions with an RTX 3080, the power supply remained cool and stable, even after several hours of use.
The cables included are plenty for most builds. We connected our motherboard, GPU, several SSDs, and still had connectors to spare.
The flat cables made routing behind the motherboard tray much easier than with traditional round cables.
At 140mm deep, it’s a bit larger than some ultra-compact options, but it still fit easily in our mid-tower case. The 10-year warranty gives us great peace of mind – Thermaltake clearly stands behind this product’s durability.
For the price point, we found it hard to beat the combination of features, quality, and reliability. This power supply hits the sweet spot for most mid to high-end gaming systems and workstations.
MSI MAG A750BE Gaming PSU
The MSI MAG A750BE offers reliable power delivery with semi-modular design at a reasonable price point, making it perfect for mid-range gaming builds.
Pros
- Quiet 120mm fan even under heavy loads
- Semi-modular design reduces cable clutter
- Multiple protection features for system safety
Cons
- Bronze efficiency rating (not Gold or Platinum)
- Cables could be thicker for better durability
- No fancy RGB lighting options
We recently tested the MSI MAG A750BE in a gaming build, and it’s quickly become one of our favorite options in the mid-range PSU market.
The 750-watt output provides plenty of juice for most modern gaming rigs, handling our RTX-equipped system without breaking a sweat.
The semi-modular design is a huge plus – we only connected the cables we actually needed, which made cable management inside our case much simpler.
During our stress tests, we were impressed by how quietly the 120mm fan operated. Even when pushing our system with demanding games, the power supply stayed cool and quiet.
The DC-DC circuit design delivered stable power to our components with minimal fluctuations. This stability is crucial when you’re in the middle of an intense gaming session.
The build quality feels sturdy, with the unit weighing about 5.4 pounds. We appreciate the multiple protection features (overvoltage, overcurrent, overpower, etc.) that give us peace of mind.
In our testing, the PSU handled power spikes from our GPU without issues. For a Bronze-rated PSU, it runs efficiently enough that we didn’t notice any significant impact on our electricity bill.
What about cable management?
The semi-modular design lets you connect only the cables you need. This means less cable clutter inside your case and better airflow.
Installation was straightforward – the standard ATX form factor fit perfectly in our mid-tower case. The cables have adequate length for most builds, though we wish they were a bit thicker.
During our two-week testing period, we didn’t encounter any stability issues or overheating problems.
For gamers building a mid-range system who don’t want to splurge on a Gold or Platinum-rated power supply, we found the MSI MAG A750BE hits the sweet spot of performance and value.
It delivers consistent power without making a racket, and the semi-modular design is a significant upgrade from non-modular options.
Buying Guide
Picking the right PSU can be tricky. We’ve put together some key points to help you choose the best power supply for your needs.
Wattage Requirements
First, figure out how much power your system needs. Add up the power needs of all your components, then add 20-30% extra for safety and future upgrades.
A 650W PSU is enough for most mid-range gaming PCs, while high-performance systems might need 850W or more.
Efficiency Ratings
Power supplies come with 80 Plus ratings that show their efficiency. Better efficiency means less electricity wasted as heat.
| Rating | Efficiency | Best For |
| 80 Plus | Basic (80%) | Budget builds |
| 80 Plus Gold | Better (87-90%) | Most users |
| 80 Plus Platinum/Titanium | Best (90-94%) | High-end systems |
Modular vs. Non-modular
We recommend modular PSUs for cleaner cable management. They let you connect only the cables you need.
Non-modular PSUs have all cables permanently attached, which can create clutter in smaller cases.
Form Factor
Make sure the PSU fits your case. ATX is standard for most desktop computers, while SFX is for smaller builds.
Protection Features
Look for PSUs with multiple protection features like OVP (over-voltage), UVP (under-voltage), and OCP (over-current).
These safety features protect your expensive components from damage during power issues.
Warranty Length
A longer warranty often indicates the manufacturer’s confidence in their product. We suggest looking for PSUs with 5+ years of warranty coverage.