CORSAIR RM 850X
The Corsair RM850x is an 850 W 80 Plus Gold‑certified fully modular ATX power supply with a quiet magnetic‑levitation fan, Zero RPM mode, broad connector set, and a long 10‑year warranty — ideal for high‑performance gaming and workstation PCs.
Features
The Corsair RM850x is a premium-class 850 W PSU designed to deliver stable, efficient, and dependable power for demanding desktop systems, gaming rigs, and professional workstations. Featuring an 80 Plus Gold efficiency rating, it achieves high conversion efficiency (= 90 %), reducing energy waste and heat output compared to non-certified units.
Its fully modular cabling allows clean and organized system builds, meaning you only attach the cables you need, improving airflow and aesthetics. The unit supports modern power standards such as ATX12V v2.4/ATX 3.1 and EPS12V 2.92, ensuring compatibility with current motherboards, CPUs, and GPUs.
Key Features
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850 W continuous power output for gaming and high-performance computing.
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80 Plus Gold efficiency for reduced power waste and lower electricity costs.
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Fully modular cable design for simpler installation and cleaner cable management.
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140 mm magnetic-levitation fan with Zero RPM mode for quiet operation at low loads.
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100 % Japanese 105 °C electrolytic capacitors for long-term reliability.
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Comprehensive protections including OVP, UVP, OPP, SCP, and OTP.
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10-year warranty for long-term peace of mind.
Technical Specifications
General Specifications
| Specification | Details |
|---|---|
| Brand | Corsair |
| Model | RM850x |
| Product Code | CP-9020200 (varies by region) |
| Power Output | 850 W continuous |
| Efficiency | 80 Plus Gold (=90 %) |
| Modular | Fully Modular |
| PSU Form Factor | ATX12V v2.4 / ATX 3.1 |
| MTBF | ~100,000 hours |
| Warranty | 10 Years |
| Weight | ~1.7 kg |
| Dimensions | ~150 × 86 × 160 mm |
Input & Power Ratings
| Specification | Details |
|---|---|
| AC Input Voltage | 100–240 V AC |
| Frequency | 47–63 Hz |
| +12 V Rail | 70.8 A / 849.6 W |
| +5 V / +3.3 V | 20 A each |
| +5Vsb | 3 A |
| -12 V | 0.3 A |
The strong +12 V rail ensures sufficient power delivery for modern CPUs and discrete GPUs.
Cooling System
| Specification | Details |
|---|---|
| Fan Size | 140 mm magnetic-levitation fan |
| Fan Mode | Zero RPM at low/medium load |
| Noise | Quiet operation due to advanced bearing and Zero RPM mode |
The inclusion of a larger, high-quality fan helps keep noise to a minimum, enhancing the user experience during typical use.
Connector Configuration
| Connector Type | Quantity |
|---|---|
| 24-pin ATX | 1 |
| EPS 4+4 pin | 2–3 depending on cable set |
| PCIe 6+2 pin | 4 |
| SATA Power | 8–14 (varies) |
| Peripheral Molex | 3–4 |
| Floppy / Adapter | 1 (optional) |
This connector suite ensures broad compatibility with modern hardware, including multi-GPU setups and numerous storage devices.
Protection Features
The PSU includes multiple built-in safety protections:
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OVP – Over-Voltage Protection
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UVP – Under-Voltage Protection
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SCP – Short-Circuit Protection
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OPP – Over-Power Protection
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OTP – Over-Temperature Protection
These protections help safeguard expensive PC components in case of electrical faults.
Advantages
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High-efficiency Gold certification ensures energy savings and lower heat generation.
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Fully modular design facilitates clean cable management and improved airflow.
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Quiet operation with Zero RPM fan mode.
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Long 10-year warranty adds peace of mind.
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Broad connector compatibility supports current and future hardware.
Conclusion
The Corsair RM850x is a robust and efficient 850 W Gold-certified PSU ideal for gamers, creators, and anyone building a high-performance PC. Its fully modular cables simplify installation and promote clean system builds, while 80 Plus Gold efficiency and a quiet magnetic-levitation fan ensure reliable and economical operation.
With broad compatibility, comprehensive protection features, and a long 10-year warranty, the RM850x stands out as a dependable power supply that can handle demanding workloads and future upgrades — making it a strong choice for both current and advanced PC builds.