Corsair HX1200i (2025) 1200W 80 Plus Platinum ATX 3.1, PCIe 5.1 PSU - CP-9020307-EU

Corsair HX1200i (2025) is a high-end modular power supply with 1200W power and 80+ Platinum certification, aimed at serious gaming and workstation builds. With support for ATX 3.0/3.1 and PCIe Gen 5.0/5.1, this PSU is ready for current and next-generation high-end GPUs. Efficiency of up to 92% means less loss as heat and more stable operation under load. The ATX format and length of 200 mm make it suitable for most mid and full tower cases, as long as you have enough space in the PSU shroud.

What you get

With 1200W real power and Active PFC, you can confidently power top GPUs + powerful CPUs, plus plenty of storage and peripherals without worrying about limits. The two PCI-E 5.1 12V-2X6 connectors at 600W each provide a direct, clean line for the latest graphics cards without the need for adapters. With a total of 5 x 6+2-pin PCI-E, 3 x EPS 8-pin (4+4), and 8 SATA connectors, you can build a serious multi-GPU or HEDT build with plenty of SSDs/HDDs. The modular design helps you use only the necessary cables, improving airflow and making cable management much easier. The large 140 mm fan takes care of cooling under load, while the high efficiency lowers the overall temperature in the case.

• Power 1200W – sufficient for high-end GPUs, powerful multi-core CPUs, and many additional components without the risk of power bottleneck.
• 80+ Platinum efficiency (up to 92%) – lower consumption from the grid and less emitted heat under the same load, helping for a quieter and cooler system.
• ATX 3.0/3.1 and PCIe Gen 5.0/5.1 support – readiness for modern and future graphics cards, compliant with new specifications for peak loads.
• 2 x 600W 12V-2X6 PCI-E 5.1 connectors – direct power for the latest GPUs without additional adapters and with high stability of the lines.
• Rich connectivity – 3 x EPS 8-pin (4+4), 5 x 6+2-pin PCI-E, 8 SATA, and 6 Molex provide flexibility for complex builds with plenty of storage, fans, and accessories.
• Modular design – all cables are separate, allowing for a clean internal look, better airflow, and easier future upgrades.
• 140 mm fan in a compact ATX body (85 x 150 x 200 mm) – serious cooling in a standard format, suitable for most mid/full tower cases.
• 120-month warranty – 10 years of coverage suggests long life and peace of mind for long-term use.

Who it is suitable for

This power supply is for you if you are building a high-end gaming or workstation with a powerful GPU according to the PCIe 5.1 standard and want a serious power and efficiency reserve. It is also suitable for builds with many drives, capture cards, and additional hardware, where stable lines and rich connectors are critical. If you are making a small, budget PC with entry-level hardware, this class of PSU will likely be excessive for you.

The combination of 1200W, 80+ Platinum efficiency, and both 600W PCIe 5.1 connectors makes Corsair HX1200i (2025) a very serious choice for a long-term, “peaceful” high-end build. This is a PSU that truly allows you to think first about the GPU and CPU, rather than whether the power supply will hold up.