Investing in a good power supply is important for your computer, especially if you’re using a powerful CPU like the AMD Ryzen 9 5900X . A quality PSU will last through many builds and work efficiently, even at higher capacities. When choosing one, decide between a modular PSU (where cables can be attached or removed) or a non-modular PSU (with fixed cables). To help you pick the best PSU for your gaming PC, we’ve tested hundreds of options and narrowed down the top choices. In this article, we’ll discuss the 5 Best power supplies for Ryzen 9 5900X , along with key factors to consider, so you can find the perfect fit for your build.
Corsair AX1000 PSU
REASONS TO BUY
✓Fully modular
✓ Sleeved cables
✓ Selectable semi-passive mode
✓ Ten-year warranty
REASONS TO AVOID
✗The short distance between the peripheral connectors
✗ Expensive
The Corsair AX1000 PSU is a top-tier power supply that’s perfect for gaming PCs, especially if you’re using the AMD Ryzen 9 5900X . Corsair is a well-known brand in computer hardware, and their AX1000 lives up to the reputation. This PSU is fully modular, meaning you can connect only the cables you need, keeping your build clean and organized. It’s also highly efficient, rated 80 PLUS Titanium , which means it wastes less energy and runs quietly.
One standout feature is the large number of connectors, including plenty of SATA and Molex connectors, plus an FDD adapter if you need it. The AX1000 delivers stable power, operates quietly, and even has a 10-year warranty , so you know it’s built to last. While it’s on the pricier side, its performance and reliability make it worth the investment for high-end systems.
The only minor downside is that some of the connectors are close together, which might cause cable management issues in certain setups.
Thermaltake Toughpower PF1
REASONS TO BUY
✓80+ Platinum Efficiency
✓ Smart Zero Fan Feature
✓ Quiet Fan
REASONS TO AVOID
✗Expensive
PCs, especially if you’re using an AMD Ryzen 9 5900X or Intel processors. It delivers 750 watts of power with excellent efficiency, earning it an 80 PLUS Platinum certification , which means it saves energy by operating at up to 92% efficiency . The PSU comes with plenty of cables and connectors, including two EPS, six PCIe, twelve SATA, and four Molex connectors, plus an FDD adapter for older devices. Cable length and spacing between connectors are good, though cable management can be a bit tricky since there are no in-cable caps.
The 120mm cooling fan uses a hydraulic bearing, ensuring quiet operation and long-lasting performance as long as the system isn’t exposed to high temperatures (above 40°C). One downside is that it lacks an MOV (metal oxide varistor) in the transient filter, meaning it may not protect against power surges as well as some other models. Additionally, while its Smart Zero Fan feature keeps things quiet by only spinning the fan when needed, the price is on the higher side for a 750W PSU.
Corsair RM750X
REASONS TO BUY
✓Excellent voltage regulation
✓ Fully modular 2x EPS
✓ 4x PCIe connectors
✓ Full power at 49 °C
✓ Efficient, Silent and Low ripple
REASONS TO AVOID
✗Again, CWT’s infamous solder bug strikes, but this time only on the VRM board
✗ Fan-test button not available
The Corsair RM750X is a popular and reliable power supply, making it a great choice for high-end systems, including those with the AMD Ryzen 9 5900X . It’s part of Corsair’s RM series, known for delivering high-quality power without excessive heat or noise.
The RM750X features a fully modular design , so you can easily connect only the cables you need, keeping your build clean and tidy. With an 80 PLUS Gold certification , it’s efficient, runs quietly, and stays cool under load.
This PSU comes with two EPS connectors and four PCIe connectors, making it ideal for powerful builds. It also has a 5-year warranty , giving you peace of mind about its reliability. While it performs well overall, its efficiency under heavy loads isn’t as competitive as some other models in its class. However, at under $150, it’s a solid budget-friendly option for a 750W power supply.
One downside is the lack of a fan-test button, which could make troubleshooting harder if issues arise. Additionally, there was a reported solder bug on the VRM board, but this doesn’t significantly impact its overall performance.
Despite these minor drawbacks, the Corsair RM750X remains a top contender in the 750W category, offering quiet operation, low ripple, and excellent build quality. If you’re looking for a dependable PSU for your Ryzen 9 5900X system, the RM750X is definitely worth considering.
XPG Core Reactor 650W
REASONS TO BUY
REASONS TO AVOID
The XPG Core Reactor 650W is a standout power supply that’s making waves in the PSU market. XPG took a big step by securing exclusive rights to Channel Well Technology’s (CWT) platform, showing their commitment to becoming a top player in the industry. This 650W PSU is compact, which makes installation easier, and its fully modular design allows you to connect only the cables you need, keeping your build clean.
One downside is that both EPS connectors are on the same cable, which can make cable management tricky in some setups. Ideally, these connectors should be on separate cables to reduce voltage drops and improve safety. However, this minor issue doesn’t overshadow the PSU’s strengths. It’s highly efficient, runs quietly, and can deliver full power even at high temperatures of up to 47°C , proving its durability.
With a 10-year warranty , the XPG Core Reactor offers peace of mind for long-term use. While it’s slightly more expensive than some other budget options, its performance and reliability make it a great choice for systems like the AMD Ryzen 9 5900X . If you’re looking for a dependable and efficient PSU without breaking the bank, the XPG Core Reactor 650W is an excellent option.
Fractal Design Ion SFX 650W Gold
REASONS TO BUY
✓10 years warranty
✓ Comes with SFX-to-ATX mounting bracket
✓ $10 cheaper than the cheapest equivalent wattage competitor
REASONS TO AVOID
✗Split ATX 24 pin at the PSU end
✗ High inrush current with 230V input
The Fractal Design Ion SFX 650W Gold is a compact yet powerful power supply designed for small form factor (SFF) builds. While Silverstone was the first brand to focus heavily on SFF PSUs, Fractal Design stepped up the game with its SFX-L units, which are slightly larger than standard SFX models. This extra size allows for better cooling thanks to a bigger fan and more relaxed fan speeds, making it quieter and more efficient than many standard SFX power supplies.
The Ion SFX 650G performs just as well as competitors like the Corsair SF600, offering 80 PLUS Gold efficiency and reliable performance. It comes with a 10-year warranty , which is rare for an SFX PSU, and includes features like fully modular cables and an SFX-to-ATX mounting bracket , making it versatile for different builds. Plus, it’s $10 cheaper than some of its closest competitors, like the EVGA 650 GM and Seasonic Focus SGX 650W.
However, there are a couple of downsides. The split ATX 24-pin connector might be tricky to fit in some setups, and the high inrush current with 230V input could cause issues in certain systems. Despite these minor drawbacks, the Fractal Design Ion SFX 650W Gold is a reliable, efficient, and high-quality PSU that’s perfect for small builds, including those with the AMD Ryzen 9 5900X . If you’re looking for a compact PSU that doesn’t compromise on performance, this is a great option.
Tips for Choosing the Right Power Supply for AMD Ryzen 9 5900X
Choosing the right power supply (PSU) can feel tricky, especially if you’re building a PC for the first time. While PSUs might not be as exciting as a new graphics card or processor, they are the backbone of your system. A good PSU ensures your components stay safe and your system runs smoothly for years. Here are some simple tips to help you pick the best PSU for your AMD Ryzen 9 5900X build:
1. Look for an 80 Plus Certified PSU
An 80 Plus certification means the PSU is at least 80% efficient at different load levels (20%, 50%, and 100%). Higher certifications like Bronze , Silver , Gold , or Platinum mean better efficiency but also higher prices. For most users, an 80 Plus Bronze or Gold PSU is a great balance between performance and cost.
2. Avoid Cheap PSUs
A cheap PSU might save money upfront, but it can harm your system in the long run. If the PSU can’t handle your components’ power needs, it could damage your CPU, GPU, or other parts during a power surge. Always choose a PSU that provides 30% more wattage than your system requires. For example, if your system needs 500W, go for a 650W PSU to stay safe.
3. Check the Number of Power Connectors
Make sure the PSU has enough connectors for your components:
- Motherboard : 24-pin (20+4) connector.
- CPU : 8-pin (4+4) connector.
- GPU : 8-pin (4+6 or 4+4) connector. If you plan to add more GPUs, SATA drives, or peripherals later, ensure the PSU has extra SATA and Molex connectors.
4. Choose the Right Cables
There are three types of PSUs based on cabling:
- Hard-Wired : All cables are permanently attached. Cheaper but harder to manage.
- Semi-Modular : Some cables are fixed (like motherboard and CPU), while others are detachable.
- Fully Modular : All cables are detachable, making cable management easier and your build cleaner.
For a tidy setup, especially with the Ryzen 9 5900X, a fully modular PSU is ideal.
5. Consider Fan Noise
PSUs generate heat, so they need fans to stay cool. Larger fans spin slower and are quieter, which is great for reducing noise in your PC. Look for PSUs with quiet fan modes or larger fans (e.g., 120mm or 140mm). If you’re building a gaming PC for a quiet room, this feature matters.
Frequently Asked Questions
How much wattage do I need for an AMD Ryzen 9 5900X system?
For a system with the AMD Ryzen 9 5900X , aim for at least 650W to 750W if you’re using a mid-range GPU. If you have a high-end GPU or plan to overclock, go for 850W or more to ensure stability and future upgrades.
What does “80 Plus Gold” mean for a PSU?
An 80 Plus Gold certification means the PSU is at least 90% efficient at typical loads (20%, 50%, and 100%). This ensures less energy is wasted as heat, saving power and keeping your system cooler.
Should I choose a modular or non-modular PSU?
A modular PSU is better for cable management because you can detach unused cables, keeping your build clean. A non-modular PSU has fixed cables, which are cheaper but harder to manage. For a tidy setup, go with a fully modular PSU .
Can a cheap PSU damage my Ryzen 9 5900X or other components?
Yes, a cheap PSU can harm your system. If it can’t handle power demands or fails during a surge, it could damage your CPU, GPU, or other parts. Always invest in a reliable, 80 Plus certified PSU to protect your build.
Do I need a PSU with a 10-year warranty?
A 10-year warranty shows the manufacturer’s confidence in their product’s durability. While not mandatory, it’s a good sign of reliability. If you want long-term peace of mind, consider PSUs with extended warranties like the Corsair AX1000 or XPG Core Reactor .
