Corsair RM850x ATX 3.1 PCIe 5.1 Ready Fully Modular 850W Power Supply – Low-Noise
PC Components
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The RM850x is Corsair's latest fully modular 850W supply, updated to the ATX 3.1 and PCIe 5.1 standards. Aimed at builders running a single high-end graphics card, it pairs Cybenetics Gold efficiency with a genuinely quiet fan profile. The headline addition is a native 12V-2x6 cable, removing the need for a bulky adapter on newer Nvidia cards.
Key Features
Native 12V-2x6 (12VHPWR-style) cable supplied direct from the unit, rather than via a bundled adapter
ATX 3.1/PCIe 5.1 compliance, built to handle the brief power spikes modern GPUs can pull
Cybenetics Gold-rated efficiency, meaning low waste heat and running costs at typical loads
Fully modular cable set, so only the leads you need go into the case
Fluid dynamic bearing fan with a zero-RPM mode that stops it spinning entirely at low loads
105°C-rated Japanese capacitors used throughout for long-term reliability
Our Verdict
A sensible pick for anyone building around a single high-end GPU, particularly newer Nvidia cards that benefit from the native 12V-2x6 lead and ATX 3.1 headroom. Quiet, well-built and modular. Those with older GPUs or tighter budgets may find a standard ATX 3.0 850W unit does the job for less.