The popular Corsair RMx line got an upgrade, which brought it up to the ATX v3.1 standards, meaning that all new RMx units have now 12V-2×6 connectors and can deliver up to 200% of their max power.
The Corsair RM850x ATX v3.1 will be included in my best ATX v3.x & PCIe 5.x PSU picks article.
The Corsair RMx line received an update to meet the ATX v3.1 requirements, which require, among others, a PSU to withstand 200% of its max power for short periods. Another unique feature of this new models is the fan speed control knob, through which you can adjust the fan’s speed at light loads, from zero RPM up to full speed. For instance, when you select a 500-600 RPM fan speed at light loads, this will be the starting point and increase once the PSU’s thermal load increases. So, instead of providing a switch to select or deselect the fan’s semi-passive mode, Corsair provided the option to choose the fan’s starting speed.
In today’s review, I will evaluate the second strongest member of the RMx ATX v3.1 line, which has a maximum power of 850W. I have already evaluated the 1000W model.
850W ATX v3.1 PSU Reviews:
- 1st Player NGDP 850W PSU Review
- be quiet! Pure Power 12 M 850W PSU Review
- be quiet! Dark Power 13 850W PSU Review
- Corsair RM850x (2021) PSU Review. The Best 850W PSU?
- Cooler Master GX III 850W ATX v3.0 PSU Review
- Cougar GEX X2 850W PSU Review
- Enermax Revolution D.F.12 850W PSU Review
- FSP VITA GM 850W ATX v3.1 PSU Review
- MSI MAG A850GL PCIE5 850W PSU Review
- Montech Titan Gold 850W PSU Review
- Sharkoon Rebel P20 850W ATX v3.1 PSU Review
- Super Flower Leadex VII PRO 850W ATX v3.1 PSU Review
- Thermaltake Toughpower PF3 850W PSU Review
- Thermaltake Toughpower GF A3 850W PSU Review
- Thermaltake Toughpower GF3 ARGB 850W PSU Review
- Thermaltake ToughPower GF3 850W ATX v3.0 PSU Review
- XPG Core Reactor II VE 850W PSU Review
- XPG KYBER 850W ATX v3.1 PSU Review
- XPG Core Reactor II 850W PSU Review
- Manufacturer (OEM): Channel Well Technology (CWT)
- Max Power: 850W
- Cybenetics Efficiency: [115V] Cybenetics Gold (87-89%), [230V] Cybenetics Gold (89-91%)
- Noise: Cybenetics A (20-25 dB[A])
- Compliance: ATX v3.1, EPS 2.92
- Operating Temperature (Continuous Full Load): 0 – 50 °C
- Alternative Low Power Mode support: Yes
- Power 12V combined: 850W
- Number of 12V rails: 1
- Power 5V + 3.3v: 150W
- Power 5VSB: 15W
- Cooling: 140mm Fluid Dynamic Bearing Fan (NR140HP)
- Semi-Passive Operation: ✓ (Adjustable Fan Speed)
- Modular Design: Yes (Fully)
- High Power Connectors: 2x EPS (2x cables), 3x PCIe 6+2 pin (3x cables), 1x PCIe 12+2 pin (600W)
- Peripheral Connectors: 8x SATA (2x cables), 3x 4-pin Molex (1x cable)
- ATX Cable Length: 610mm
- EPS Cable Length: 750mm
- 12+2 pin PCIe Cable Length: 650mm
- 6+2 pin PCIe Cable Length: 650mm
- Distance between SATA / 4-pin Molex: 115/100mm
- In-cable capacitors: No
- Dimensions (W x H x D): 150 mm x 85 mm x 160mm
- Weight: 1.79 kg (3.95 lb)
- Warranty: 10-years
- MSRP (excluding VAT): $150
Power Specifications
| Rail | 3.3V | 5V | 12V | 5VSB | ||
| Max. Power | Amps | 20 | 20 | 70.8 | 3 | |
| Watts | 150 | 849.6 | 15 | |||
| Total Max. Power (W) | 850 | |||||
Hey Aris, thank you for the review. After my long research and your articles, I finally bought this product (it finally arrived in my country). Is it a problem if the 3.3V channel drops below 3.2? If it is a problem, what causes it?