CORSAIR RM850e ATX 3.1 PCIe 5.1 Ready Fully Modular 850W Power Supply – 12V-2x6 Cable Included, Cybenetics Gold Efficiency, 105°C-Rated Capacitors, Modern Standby Mode – Black
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AI Verdict
This 850W ATX 3.1, PCIe 5.1 fully modular power supply with a 12V-2x6 cable is for modern PC builders needing current GPU compatibility without breaking the bank.
This 850W power supply is a strong fit for most modern gaming and enthusiast PC builds, especially considering its ATX 3.1 and PCIe 5.1 compliance with an included 12V-2x6 cable. Its Cybenetics Gold efficiency and fully modular design offer a compelling package for its price band.
If you need even quieter operation under heavy loads or a longer warranty, look for PSUs with higher efficiency ratings like Platinum or Titanium, and a 10-year warranty.
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Pros
- Compliant with ATX 3.1 and PCIe 5.1 standards, supporting 2x transient power excursions from the GPU.
- Includes a native 12V-2x6 GPU power cable for modern graphics cards like the NVIDIA RTX 40 Series.
- Cybenetics Gold efficiency certification ensures up to 89% overall efficiency for lower power consumption.
- Features 105°C-rated industrial-grade capacitors for consistent, reliable power delivery.
- Fully modular cabling allows connecting only necessary cables, reducing clutter.
- A 120mm rifle bearing fan with Zero RPM mode keeps noise down at lower loads.
Cons
- Some users report coil whine, particularly under load.
- The 7-year warranty is shorter compared to the 10-12 years offered on some higher-end PSUs.
- Cables are plain rubber and not individually sleeved, which some users find less premium.
- SATA cables can be stiff, potentially causing clearance issues in compact cases if multiple devices are connected.
- Uses non-Japanese capacitors, which some enthusiasts consider a downgrade from premium models.
Dimension Scores
The 850W output with Cybenetics Gold efficiency and ATX 3.1 / PCIe 5.1 compliance is above category average for its price point.
The 120mm rifle bearing fan with Zero RPM mode ensures quiet operation at low loads, though some users report coil whine under specific conditions.
It uses 105°C-rated industrial-grade capacitors and a robust LLC topology with DC-DC conversion, indicating solid internal components.
Being fully modular with a compact 140mm casing aids in clean builds, but the non-sleeved and potentially stiff SATA cables are a minor drawback.
Best For
- Gaming PCs with NVIDIA RTX 40 series GPUs or other PCIe 5.1 compatible cards.
- Compact PC builds due to its 140mm-long casing.
- Users prioritizing quiet operation during light tasks with its Zero RPM fan mode.
- Systems utilizing Modern Standby for faster wake-from-sleep times.
Not Recommended For
- Enthusiasts demanding the absolute quietest PSU under all loads without any potential for coil whine.
- Users who prefer individually sleeved cables for aesthetic reasons without buying aftermarket sets.
- Builds where a warranty longer than 7 years is a primary concern.
Watch Out For
- Reports of coil whine from some users, which can be an audible annoyance depending on system load and individual sensitivity.
- The included cables are not individually sleeved, meaning they are flat ribbon-style, which might not suit all aesthetic preferences.
- SATA power cables, while capable of powering up to four devices per cable, can be stiff and bulky, potentially creating clearance problems in smaller cases.
- While featuring 105°C-rated capacitors, some Reddit users note the absence of Japanese-branded capacitors, which are often associated with higher-tier PSUs.
Full Specifications
| ASIN | B0FLG5S4FP |
| Brand | Corsair |
| Color | Black |
| Series | RM850e |
| Wattage | 850 watts |
| Model Name | RM850e |
| Form Factor | ATX |
| Item Weight | 3.37 pounds |
| Manufacturer | Corsair |
| Connector Type | ATX |
| Cooling Method | Air |
| Output Wattage | 850 Watts |
| Item model number | CP-9020296-NA/AM |
| Compatible Devices | Monitor |
| Product Dimensions | 5.91 x 5.51 x 3.35 inches |
| Item Dimensions LxWxH | 5.91 x 5.51 x 3.35 inches |
| Item dimensions L x W x H | 5.91 x 5.51 x 3.35 inches |
What Buyers Say
Many users are stoked about getting ATX 3.1 and PCIe 5.1 readiness, including that crucial 12V-2x6 cable, without spending a fortune. The compact 140mm size also gets a lot of love for making builds easier, especially in smaller cases. However, some folks have definitely noticed coil whine, which can be a real buzzkill, and the plain, unsleeved cables are a recurring point of contention for those who care about aesthetics.
“Man, this PSU is exactly what I needed for my new RTX 4070 Ti Super, the 12V-2x6 cable is a lifesaver, but seriously, the coil whine sometimes makes me wanna pull my hair out!”
Common Praise
- Native 12V-2x6 connector for new GPUs is a huge plus.
- The 140mm compact casing fits easily into modern PC cases.
- Zero RPM fan mode keeps it silent during light use.
- Fully modular design simplifies cable routing and reduces clutter.
- Provides stable power for demanding hardware.
Common Complaints
- Audible coil whine reported by a segment of users.
- Cables are not individually sleeved, described as 'plain rubber cables'.
- SATA cables can be stiff and bulky, making them difficult to manage in tight spaces.
- The 7-year warranty is shorter than some competitors' 10-year offerings.
- Some users express disappointment over the use of non-Japanese capacitors.
Ownership Tips
- Coil whine can develop or become more noticeable after a few weeks of use, especially under specific loads.
- The stiffness of the peripheral cables (SATA, Molex) can make routing challenging, requiring more force and planning than expected.
- The Zero RPM fan mode works as advertised, keeping the system very quiet during web browsing or light gaming.
- Installation is genuinely easier in smaller cases due to the 140mm length, leaving more room for cable tucking.
- The included 12V-2x6 cable is robust and feels secure, eliminating the need for GPU adapter cables.
Frequently Asked Questions
Is this power supply compatible with NVIDIA RTX 40 series graphics cards?
Yes, it is compliant with ATX 3.1 and PCIe 5.1 standards and includes a native 12V-2x6 GPU power cable, making it compatible with modern graphics cards like the RTX 40 series.
How quiet is the CORSAIR RM850e?
It features a 120mm rifle bearing fan with a specially calculated fan curve and Zero RPM mode, which means the fan won't spin at low to medium loads, resulting in near-silent operation.
What is the warranty period for this power supply?
The CORSAIR RM850e comes with a 7-year warranty.
What does 'fully modular' mean for the cables?
Fully modular means you only connect the cables your system needs, which helps reduce cable clutter inside your PC case and improves airflow.
What is Cybenetics Gold efficiency?
Cybenetics Gold efficiency means the power supply operates at up to 89% overall efficiency, leading to lower power consumption, less heat generation, and reduced operating costs.
Buying Guide
When you're building a PC, the power supply (PSU) isn't the flashiest part, but it's crucial. It converts wall power into usable electricity for all your components. You need enough wattage to run everything, especially your graphics card and CPU, and a good efficiency rating means less wasted energy and heat. Modularity helps keep your build clean and tidy by letting you only plug in the cables you actually need.
Wattage (850W)
ATX 3.1 & PCIe 5.1 Ready
Fully Modular
Cybenetics Gold Efficiency
Alternatives
If this PSU doesn't quite fit, consider looking for a higher wattage (e.g., 1000W) for extreme multi-GPU setups, a Platinum or Titanium efficiency rating for maximum power savings and less heat, or a model with a 10-year warranty for extended peace of mind.
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