Overview
The Corsair RM850x (2023) is a highly reliable 80 PLUS Gold certified fully modular power supply known for its quiet operation and long-term dependability. It features a 135mm fluid dynamic bearing fan with a zero RPM mode that keeps the fan off under low loads. While not ATX 3.0 native, it provides stable and clean power for modern CPUs and GPUs.
Key Features
- 80 PLUS Gold efficiency reduces heat output and electricity costs without compromising performance.
- Fully modular cables let you connect only what you need, making cable management clean and easy.
- 135mm fluid dynamic bearing fan ensures quiet operation; zero RPM mode stops the fan entirely under about 20% load.
- Japanese 105°C rated capacitors deliver high reliability and longevity.
- 10-year warranty offers peace of mind for long-term use.
Compatibility Guide
- Form factor: ATX. Fits most mid-tower cases; measure your PSU bay depth (unit length is about 160mm).
- Connectors: Main 24-pin, dual CPU 8-pin (4+4), four PCIe 6+2-pin, nine SATA, six peripheral. Ample PCIe cables for high-end GPUs.
- Not ATX 3.0 compliant; for RTX 40/50 series with 12VHPWR, use the included adapter or a dedicated Corsair Type 4 12VHPWR cable (sold separately).
- Check case PSU bay clearance: 160mm+ required.
Ideal Builds
- Mid-range to high-end gaming PCs – pairs well with RTX 4070 Ti Super, RX 7900 XT, Ryzen 7 or Core i7.
- Silent PC builds – zero RPM mode keeps fan off at idle; fluid bearing fan stays quiet under load.
- Long-term home servers or workstations – high-grade capacitors and 10-year warranty provide reliability.
Upgrade Considerations
- Since it lacks native 12VHPWR, if you plan to upgrade to a high-end RTX 40/50 series GPU, factor in the need for an adapter or aftermarket cable.
- 850W is sufficient for most single-GPU builds but borderline for a Core i9 + RTX 4090; for ultimate headroom consider a 1000W+ PSU.
- Custom cables using Corsair Type 4 pinout are available for cleaner builds.