Power supply Corsair RMx SHIFT 2025 RM850x 850W 80 Plus Gold ATX 3.1, PCIe 5.1 - CP-9020299-EU

This power supply Corsair RM850x RMx SHIFT 2025 is a serious option for mid- to high-end gaming or workstation configurations where stability and efficiency are more important than anything else. You have 850W power and 80+ Gold certification, which means less loss and lower consumption at the same load. The format is standard ATX, so it fits in most mid and full tower cases. The power supply is fully modular and is prepared for the new standards ATX 3.0/3.1 and PCIe Gen 5.0/5.1, so you don't have to think about upgrading the PSU with the next GPU.

What you get

With real 850W, you can easily run a powerful GPU and serious CPU, plus several SSD/HDD and peripherals, without wondering if you're on the edge of the power supply's capabilities. 80+ Gold and the stated efficiency of 90% help lower electricity bills and reduce heat in the case, which directly affects noise levels. The large 140mm fan can run at lower speeds for the same airflow compared to a smaller fan, which usually means quieter operation under typical gaming load. The modular design allows you to use only the necessary cables, better organize your case, and improve airflow around the CPU and GPU. Support for ATX 3.0/3.1 and PCIe Gen 5.0/5.1 covers you for modern graphics cards with new connectors and peaks in consumption without risking instability.

• Power 850W – sufficient for strong gaming or creative build with high-end GPU and many additional devices.
• 80+ Gold certification – higher efficiency and less energy lost as heat under typical gaming mode.
• Efficiency around 90% – lower consumption from the grid at the same delivered power, which is a plus during long gaming sessions or renders.
• ATX 3.0/3.1 and PCIe Gen 5.0/5.1 compatibility – readiness for current and future graphics cards with modern power connectors and variable load.
• Modular power supply unit – cleaner cable management, better airflow, and easier installation in more compact cases.
• 140mm fan – larger diameter for better cooling at lower speeds and potentially quieter operation under load.
• 120 months warranty – 10 years coverage, which is a serious horizon if you plan to use the PSU over several generations of hardware.
• Compact size 150 x 86 x 160 mm – standard ATX format with a length of 160 mm, suitable for most modern cases.

Who is it suitable for

This power supply is suitable if you are building a strong gaming or workstation build with plans for future upgrades to more powerful GPUs and want ATX 3.0/3.1 and PCIe Gen 5.0/5.1 covered. It is also a good choice if you care about low noise and a clean internal appearance of the case thanks to the modular design. If you are making a completely budget configuration with a basic GPU and low consumption, 850W and such a class PSU may be a bit overkill.

The strongest combination here is the balance between 850W power, 80+ Gold efficiency, and support for the latest ATX and PCIe standards, backed by a 10-year warranty, so you can confidently plan a long-term build.