850W RMX SERIES RM850X V3 PSU ATX 3.
£103.88 inc VAT
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About This Item
- 850 W fully modular ATX power supply
- Cybenetics Gold-certified efficiency for reduced energy waste
- Active cooling with single fan for quiet operation
- Supports ATX 3.1 standard with 24-pin motherboard connector
- Comprehensive protection: over current, over power, over voltage, overheating, short circuit
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Corsair RM850x | Gold-Certified 850W Modular ATX PSU
The Corsair RM850x power supply unit 850 W 24-pin ATX ATX Black delivers reliable, efficient power for high-performance PC builds. This fully modular ATX 3.1 PSU combines 80 PLUS Gold certification with quiet operation, making it ideal for gamers, content creators, and system builders who demand stable power delivery without excess noise.
Key Specifications
| Metric | Spec. |
|---|---|
| Total Power | 850 W |
| Efficiency Rating | 80 PLUS Gold |
| Form Factor | ATX |
| Modular Design | Fully Modular |
| Cooling | Active (1x fan) |
Why Choose This PSU?
This Corsair RM850x power supply unit 850 W 24-pin ATX ATX Black offers exceptional efficiency through its 80 PLUS Gold certification, reducing energy waste and heat generation. The fully modular design means you connect only the cables you need, improving airflow and simplifying cable management in your case. With ATX 3.1 compliance, it provides stable power delivery for modern components including high-end graphics cards and processors.
Silent Operation for Focused Work
The RM850x features a Zero RPM fan mode that keeps the fan completely off during low to medium loads, eliminating unnecessary noise. When cooling is required, the 120mm rifle bearing fan operates quietly while maintaining optimal temperatures. This makes the Corsair RM850x power supply unit 850 W 24-pin ATX ATX Black perfect for noise-sensitive environments like home offices or recording studios where system acoustics matter.
Built-In Protection for Your Components
Comprehensive protection features safeguard your valuable hardware from electrical issues. The Corsair RM850x power supply unit 850 W 24-pin ATX ATX Black includes over current, over power, over voltage, overheating, and short circuit protection. These safeguards work continuously to prevent damage from power fluctuations, ensuring your components remain safe during both normal operation and unexpected electrical events.
Box Contents
- Corsair RM850x power supply unit
- AC power cable
- Modular cable set
- Cable ties
- User manual
Check Before You Buy
- Confirm your case has sufficient space for ATX PSU dimensions (150 x 160 x 86 mm)
- Verify your system requires 850W total power draw
- Check that your GPU and CPU power connectors match available outputs
- Ensure your region’s power grid falls within 100-240V range
Frequently Asked Questions
Q: Is this PSU compatible with my motherboard?
A: Yes, it includes a standard 24-pin ATX motherboard connector compatible with all modern motherboards.
Q: Can I use this for a gaming PC with RTX 4090?
A: The 850W capacity suits high-end gaming systems, but verify your GPU’s specific power requirements before purchase.
Q: Does it support PCIe 5.0 graphics cards?
A: Yes, ATX 3.1 compliance ensures stable power delivery for PCIe 5.0 devices and next-generation components.
Q: How many storage drives can I connect?
A: With 8 SATA power connectors, you can power up to eight SATA drives or SSDs.
Q: Is the fan always running?
A: No, the Zero RPM mode keeps the fan off during light loads, activating only when needed for cooling.
The Consultant’s Verdict & Warranty
The Corsair RM850x power supply unit 850 W 24-pin ATX ATX Black represents excellent value for users building reliable, quiet systems between 600-850W power requirements. Its combination of Gold efficiency, full modularity, and comprehensive protection makes it suitable for gaming rigs, content creation workstations, and professional PCs. Covered by the standard Manufacturer Warranty, this PSU delivers the quality and reliability expected from Corsair’s RMx Series.
| Cooling | |
|---|---|
| Number of fans | 1 fan(s) |
| Cooling type | Active |
| Design | |
| 80 PLUS certification | 80 PLUS Gold |
| Product colour | Black |
| Number of fans | 1 fan(s) |
| Illumination | No |
| Cooling type | Active |
| Power | |
| Total power | 850 W |
| AC input voltage | 100 - 240 V |
| AC input frequency | 47 - 63 Hz |
| Input current | 10 - 5 A |
| Combined power (+3.3V) | 150 W |
| Combined power (+12V) | 849.6 W |
| Combined power (+5V) | 150 W |
| Combined power (+5Vsb) | 15 W |
| Max output current (+3.3V) | 20 A |
| Max output current (+12V) | 70.8 A |
| Max output current (+5V) | 20 A |
| Max output current (+5Vsb) | 3 A |
| Power protection features | Over current, Over power, Over voltage, Overheating, Short circuit |
| Efficiency | 90% |
| Ports & interfaces | |
| Motherboard power cable length | 61 cm |
| Motherboard power connector | 24-pin ATX |
| Number of SATA power connectors | 8 |
| Number of PATA power connectors | 3 |
| Peripheral (Molex) power connectors (4-pin) | 2 |
| EPS power connector (8-pin) | No |
| PCI Express power connectors (6+2 pin) | 3 |
| Cabling type | Fully-Modular |
| EPS power connector (4+4 pin) | Yes |
| PCI Express power connectors (12+4 pin) | 1 |
| Performance | |
| Power supply unit (PSU) form factor | ATX |
| Silent mode | Yes |
| 80 PLUS certification | 80 PLUS Gold |
| Purpose | PC/Server |
| ATX version | 3.1 |
| Certificates | |
| Compliance certificates | Low Voltage Directive (LVD), RoHS, UKCA |
| 80 PLUS certification | 80 PLUS Gold |
| Packaging content | |
| Cables included | AC |
| Cable tie(s) included | Yes |
| Weight & dimensions | |
| Width | 150 mm |
| Depth | 160 mm |
| Height | 86 mm |
| Weight | 3.28 kg |
| Packaging data | |
| Cables included | AC |
| Technical details | |
| Compliance certificates | Low Voltage Directive (LVD), RoHS, UKCA |
| Identifiers | |
| Distributor SKUs | 125473, STD10228898, 2040323, CLCP-9020270-UK |
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