ATX Power Supplies (PSUs)
When you're building a desktop PC, the ATX power supply is one of the most important components you'll choose. It determines how much power your system has available, how efficiently it converts that power, and how stable your build runs under load. CORSAIR ATX PSUs are engineered to meet the demands of gaming rigs, content creation workstations, and high-performance desktop builds.
What Is an ATX Power Supply?
When you're building a desktop PC, the ATX power supply is one of the most important components you'll choose. It determines how much power your system has available, how efficiently it converts that power, and how stable your build runs under load. CORSAIR ATX power supplies are engineered to meet the demands of gaming rigs, content creation workstations, and high-performance desktop builds.
ATX is the standard form factor for desktop PC power supplies. An ATX PSU connects to your motherboard, GPU, storage drives, and other components, converting AC power from your wall outlet into the DC voltages your hardware needs. Because it's a widely adopted standard, ATX power is compatible with the vast majority of mid-tower and full-tower cases on the market.
Choosing the Right Wattage
Wattage is the starting point for any ATX PSU decision. Your total system power draw depends on your CPU, GPU, and the rest of your components. As a practical guide:
- Mainstream gaming builds with a mid-range GPU typically need 650W to 750W
- High-performance builds with a top-tier discrete GPU often require 850W to 1000W
- Enthusiast or multi-GPU workstation builds may need 1200W or more
Choosing a PSU with some headroom above your estimated draw helps maintain stable performance and gives you room to upgrade components later.
Efficiency Ratings Explained
ATX PSUs carry 80 PLUS or Cybenetics efficiency certifications that tell you how much power is wasted as heat during conversion. Ratings range from 80 PLUS White through Bronze, Gold, Platinum, and Titanium. A Gold-rated ATX PSU, for example, converts power with less waste than a Bronze-rated unit, which can lower your electricity costs over time and reduce heat inside your case.
Modular vs. Non-Modular Designs
Cable management affects both airflow and build aesthetics. ATX PSUs come in three configurations:
- Non-modular: All cables are permanently attached.
- Semi-modular: Essential cables are fixed; additional cables are detachable.
- Fully modular: Every cable detaches, giving you a cleaner build with only the cables you need.
ATX 3.0 and Modern GPU Compatibility
Newer ATX PSU designs support the ATX 3.0 specification and include native 12V-2X6 connectors for modern high-power GPUs. If you're pairing your build with a recent discrete graphics card, choosing an ATX 3.0-compatible unit helps deliver stable power during demanding gaming sessions.
Browse the full range of CORSAIR ATX power supplies to find the right wattage, efficiency rating, and cable configuration for your build.