ATX 3.1 AND 12V-2X6 POWER SUPPLY STANDARD
With the release of NVIDIA’s RTX 4090, a new power connector was introduced to support the card’s massive 450W power requirement. Soon after, reports of the connector overheating emerged, in some cases leading to permanent damage. In response, the ATX standard was updated with revisions to the connector design.
WHAT IS THE ATX STANDARD?
A fully functioning PC is built from components made by different manufacturers. To ensure compatibility, the motherboard, graphics card, and power supply unit (PSU) follow a predefined standard. This is called the ATX (Advanced Technology eXtended standard), introduced by Intel in 1995. Over the years, the ATX standard has seen many revisions to keep pace with evolving hardware requirements.
WHY ATX MATTERS
The ATX standard ensures that components from different manufacturers can work together reliably. It also covers power supplies, including connector designs for each component and the safety standards they must meet. As a result, consumers can easily choose ATX-compliant parts with far less concern about compatibility or power delivery issues.
WHAT CHANGED IN ATX 3.1?
ATX 3.0 introduced the 12VHPWR connector for GPU power. This single connector can deliver up to 600W of power, and was intended to replace the older PCIe 6+2 pin connectors. In practice, some users reported overheating issues when used with power-hungry GPUs such as the RTX 4090.
ATX 3.1’s key change was the introduction of the 12V-2x6 GPU power connector for the PSU. It is an improved version of the 12VHPWR, designed to improve connection robustness and reduce the risk of overheating. The GPU side-socket remains the same, and GPUs continue to be compatible with both 12VHPWR and 12V-2x6 power cables.
DO YOU NEED AN ATX 3.1 POWER SUPPLY?
If you are building a PC with a high-end NVIDIA RTX 40 or 50 series GPU, an ATX3.1-compliant PSU is strongly recommended. The 12V-2x6 connector can deliver up to 600W to the GPU with minimal risk of overheating when properly connected.
For top-tier systems with multiple RTX 4090 or 5090 GPUs, the FUSION 1600 TITANIUM is an ideal match. It is ATX 3.1-compatible and 80 PLUS and Cybenetics Titanium-certified.
AMD still uses the proven PCIe 6+2-pin connector for most GPUs, but some RX 9070 and 9070 XT models use the newer 12V-2x6 interface. In such cases, choose an ATX 3.1-compliant PSU that also includes PCIe 6+2-pin support, such as the CORE REACTOR II. It supports both NVIDIA RTX 40/50 series and AMD’s RX 7000/9000 series GPUs, making it suitable for builds ranging from mainstream to high-end.
Even if you are using an older RX 5000 series or RTX 30 series GPU, an ATX 3.1 PSU still offers advantages. Beyond improved upgrade readiness, it is designed to better handle power excursions (brief power spikes) that can otherwise cause instability.
WHAT IS POWER EXCURSION?
High-end GPUs can draw brief power spikes from the PSU, especially during demanding workloads like rendering, AI inference, or high-resolution gaming. If the PSU cannot handle these spikes, it may lead to system instability or sudden shutdowns.
The ATX 3.0 standard requires compliant PSUs to tolerate short-duration power delivery of at least 200% of their rated wattage, a requirement that continues in ATX 3.1.
All XPG PSUs comply with ATX 3.1 and support power excursions up to 235%, exceeding the ATX minimum and providing added stability and upgrade readiness for next-generation GPUs.
