Lieferung heute & morgen
Qualitätsgarantie
Willkommens-Angebote freischalten: KOSTENLOSE Lieferung | Bis zu 80 % RABATT | Kostenlose 30-Tage-JoyPlus-Testphase
App herunterladen
By Joybuy Product Recommendation Officer, July 04, 2026
Assembling or upgrading a high-performance PC can be a complex task, especially when it comes to the power supply. With the introduction of new graphics card generations like the NVIDIA RTX 40 and 50 series, the demands on power supply units (PSUs) have also increased. Standards like ATX 3.1 and PCIe 5.1 are now key considerations for anyone looking to build a stable and future-proof system.
This article serves as an objective guide. It's designed to help you understand the technical specifications and make an informed decision without getting lost in marketing jargon. As your Joybuy Product Recommendation Officer, I have gathered information to give you a clear overview of relevant models and their features.
Before we look at specific products, here are some fundamental criteria to help you with your selection.
The ATX 3.1 standard was specifically developed to meet the high demands of modern hardware. An ATX 3.1 power supply is capable of handling brief, extreme power spikes (power excursions) from graphics cards, which can be two to three times their rated power. This ensures greater system stability under load and prevents unexpected crashes during intense gaming sessions or when running demanding applications.
Closely related is the new power supply with a 12V-2x6 connector, an enhancement of the 12VHPWR plug. This connector is designed for PCIe 5.1 power supply compatibility and delivers up to 600 watts directly to the graphics card without the need for adapters. The result is a cleaner, safer, and more reliable power connection.
The required wattage depends on your system's components. For high-end systems with a graphics card like the RTX 4090, an 850W Gold PC power supply has become a solid standard. It offers sufficient power headroom for overclocking and future upgrades, making it an excellent power supply for RTX 4090.
Efficiency, indicated by the 80 PLUS certification (e.g., Bronze, Gold, Platinum), describes how much power from the wall outlet is actually delivered to the PC components. An 80 PLUS Gold certified power supply has an efficiency rating of at least 90% at 50% load. This means less energy is lost as heat, leading to lower operating costs and quieter operation, as the fan needs to run less frequently or at lower speeds. A quiet PC power supply is often the direct result of high efficiency.
A fully modular power supply offers maximum flexibility. You only connect the cables you actually need for your components. This has two key advantages:
Non-modular power supplies have all cables permanently attached and are often a more cost-effective option for systems where cable management is a secondary concern.
Here is a selection of power supplies that cover different requirements and budgets.
Why It Stands Out: The be quiet! Pure Power 13 M 850W combines high efficiency with the extremely quiet operation the brand is known for. It meets the ATX 3.1 standard and offers stable voltage regulation thanks to its LLC topology, making it an excellent choice for power-hungry yet noise-sensitive systems.
Pros:
Who Is It For? For users seeking a high-end gaming power supply or a PSU for a workstation who place the highest value on quiet operation, efficiency, and future-proofing.
Why It Stands Out: The CORSAIR RM850e (2025 model) is a powerful and reliable power supply designed for modern PC builds. It is fully ATX 3.1 compliant and features a Zero RPM Fan Mode, which completely turns off the fan at low to medium loads for near-silent operation during everyday use.
Pros:
Who Is It For? For PC builders and gamers looking for an 850W Gold PC power supply from an established brand that offers both performance and quiet operation for demanding systems.
Why It Stands Out: The MSI MAG A750GLS offers a solid entry point into the world of ATX 3.1 power supplies. With 750 watts of power, 80 PLUS Gold efficiency, and a fully modular design, it covers the needs of many high-end systems. A practical detail is the yellow-marked 12V-2x6 connector, which visually indicates if it's correctly plugged in.
Pros:
Who Is It For? For system builders who need a future-proof and efficient fully modular power supply for a mid-range to high-end system and value ease of installation.
Why It Stands Out: The CORSAIR CX650 is a proven and cost-effective choice for standard PCs and mid-range gaming systems. It doesn't offer ATX 3.1 features, but with 650 watts and an 80 PLUS Bronze certification, it delivers stable and reliable performance for systems that don't use the very latest high-end components.
Pros:
Who Is It For? For users building an office PC or an entry-level to mid-range gaming system who are looking for a reliable, hassle-free power supply without the latest specifications.
The models presented here cover common use cases, but every PC build is unique. If you're looking for a different wattage, a higher efficiency class, or specific features not listed here, you might find the right model in our broader selection.
️ Explore our full range of Computer Power Supplies.
1. Is an ATX 3.1 power supply necessary for an RTX 4090? Although an RTX 4090 can be operated with older power supplies and adapters, an ATX 3.1 power supply is highly recommended. It is better designed to handle the card's high, brief power spikes, which increases system stability and minimises the risk of crashes. Additionally, the native 12V-2x6 connector simplifies cable management and is considered a safer connection.
2. What is the difference between ATX 3.0 and ATX 3.1? ATX 3.1 is a minor but important revision of the ATX 3.0 standard. The primary change concerns the power connector for graphics cards: the 12VHPWR plug has been replaced by the more robust and secure 12V-2x6 connector. This new plug is mechanically optimised to ensure a more complete and secure connection. ATX 3.1 power supplies are fully backward compatible.
3. Can I use an 850W power supply even if my system consumes less power? Yes, that's perfectly fine and often even beneficial. A power supply only delivers as much power as the components actually request. An oversized PSU provides power headroom for future upgrades. Furthermore, power supplies operate most efficiently in the 40-60% load range, which often leads to quieter and cooler operation with a more powerful PSU.