Excellent efficiency and high-speed connectors.
Top of the market for performance and reliability.
Good value with PCIe 12VHPWR connectors.
👍 What we like
- ✓80 Plus Titanium certification for optimal energy performance.
- ✓High-speed PCIe connectors (12VHPWR) for the latest generation of graphics cards.
- ✓Active and quiet cooling thanks to smart fans.
- ✓Advanced features such as real-time monitoring via software.
👎 What to watch
- ✕Higher price compared to uncertified standard power supplies.
- ✕Larger size and weight than lower-end models.
- ✕Complex configuration for PCIe high-speed connector wiring.
🏆 Our picks
Affiliate links · same price for youCorsair AXi Series AX850 850W
Amazon · price and availability on the listing
Seasonic PRIME TX-1000 Platinum
Amazon · price and availability on the listing
EVGA SuperNOVA P2 750 W
Amazon · price and availability on the listing
See all our recommended gear in the shop.
📑 Contents ▾
In 2026, choosing the right power supply for your home lab or NAS is crucial. The ATX 3.1 standard introduces new requirements in terms of energy efficiency and performance. This guide helps you select the ideal power supply among models such as Corsair AXi Series AX850 850W, Seasonic PRIME TX-1000 Platinum, and EVGA SuperNOVA P2 750 W.
Why this choice matters
Why choose an ATX 3.1 power supply in 2026? The ATX 3.1 standard is designed to meet the growing energy needs of high-end graphics cards and processors, with the arrival of PCIe 5.0 and PCIe Power Connector (12VHPWR) specifications. These power supplies not only offer maximum power but also exemplary energy efficiency thanks to the 80 Plus Titanium certification. Additionally, they incorporate advanced technologies like active cooling to minimize operating noise and extend product lifespan.
Buying criteria
To evaluate an ATX 3.1 power supply in 2026, we focused on performance, reliability, and value for money.
Performance includes the maximum power delivered, efficiency rates under different load levels (full load, partial load), and integration of high-speed PCIe connectors. Reliability is measured by average lifespan and hours guaranteed. Value for money integrates cost with energy efficiency over time, paying particular attention to advanced features such as monitoring software.
We did not test these products ourselves: the figures on this page are indicative orders of magnitude that we have not verified; refer to the manufacturers’ spec sheets.
Presentation of the 3 recommended products
1. Corsair AXi Series AX850 850W
The Corsair AXi Series AX850 850W is a judicious choice for users concerned with performance and energy efficiency. With an 80 Plus Titanium certification, this power supply offers exceptional full load efficiency of over 94%. It integrates four high-speed PCIe connectors (12VHPWR) for the latest generation graphics cards and features active cooling that ensures stable temperatures even under heavy loads.
2. Seasonic PRIME TX-1000 Platinum
The Seasonic PRIME TX-1000 Platinum is the benchmark in performance for high-end systems. With a maximum power of 1000W and an efficiency rate exceeding 96%, it offers unrivaled levels of performance on the market. Its compact design and ATX 3.1 compatibility make it the ideal power supply for systems requiring precise wiring.
3. EVGA SuperNOVA P2 750 W
The EVGA SuperNOVA P2 750 W offers an excellent alternative to high-end models with unbeatable value for money. Certified with the 80 Plus Titanium rating, it delivers solid performance with an average efficiency rate of 93%. It also integrates the necessary high-speed PCIe connectors for the latest GPUs and is equipped with a silent active cooling system.
Comparison table
| Product | Maximum Power (W) | 80 Plus Certification | High-Speed PCIe Connectors | Full Load Efficiency (%) |
|---|---|---|---|---|
| Corsair AXi Series AX850 850W | 850 | Titanium | 4x 12VHPWR | 94 |
| Seasonic PRIME TX-1000 Platinum | 1000 | Platinum | 4x 12VHPWR | 96 |
| EVGA SuperNOVA P2 750 W | 750 | Titanium | 3x 12VHPWR | 93 |
Note: Performance may vary based on system configuration.
Use cases
For professional users seeking a reliable and high-performing power supply for an intensive home lab, the Seasonic PRIME TX-1000 Platinum is essential. It also suits NAS (Network Attached Storage) systems requiring high power and top-tier energy efficiency.
For enthusiasts aiming to optimize their system’s performance without sacrificing too much budget, the Corsair AXi Series AX850 850W offers an excellent balance between efficiency and cost. It’s ideal for gaming or creative setups with high-end graphics cards.
Finally, the EVGA SuperNOVA P2 750 W is perfect for those looking for a product offering a good performance-to-cost ratio. It fits well in medium to high-power systems.
Pitfalls to avoid
One common pitfall when choosing an ATX 3.1 power supply lies in purchasing non-certified models or those with efficiency ratings below the 80 Plus Titanium standard. These products may provide sufficient power but have mediocre energy efficiency, leading to higher electricity costs over time.
Another frequent mistake: neglecting the integration of high-speed PCIe connectors (12VHPWR) necessary for the latest generation graphics cards. This can limit the system’s ability to support powerful configurations.
Lastly, it is crucial to verify that the wiring provided by the power supply matches the specific needs of your system (number and type of PCIe connectors), to avoid over or under-configuring.
Verdict
Selecting an ATX 3.1 power supply in 2026 requires careful attention to energy performance, product reliability, and precise wiring needed for high-end graphics cards. Our verdict: opt for the Seasonic PRIME TX-1000 Platinum if you seek top-tier performance; the Corsair AXi Series AX850 850W offers an excellent balance between efficiency and cost, while the EVGA SuperNOVA P2 750 W is ideal for those looking for a reliable power supply at a lower cost.
For more hardware recommendations for your home lab or NAS, visit our page /materiel-recommande/