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 – White
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AI Verdict
This 850-watt, ATX 3.1, Cybenetics Gold, fully modular power supply with a 12V-2x6 cable is for PC builders needing modern GPU support and efficient power in a compact 140mm length.
This 850-watt CORSAIR RM850e is a strong fit for most modern PC builds, especially those with current-generation GPUs, due to its ATX 3.1 certification and included 12V-2x6 cable. Its fully modular design and compact 140mm length simplify installation and cable management in a range of cases.
If you need even higher power efficiency or a longer warranty, look for PSUs with Cybenetics Platinum or Titanium ratings and 10-12 year warranties.
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Pros
- Includes a native 12V-2x6 GPU power cable for current NVIDIA 40 Series graphics cards, avoiding adapters.
- ATX 3.1 certified and PCIe 5.1 compliant, supporting 2x transient power excursions from the GPU.
- Features a 120mm rifle bearing fan with Zero RPM Fan Mode for near-silent operation at lower loads.
- Equipped with industrial-grade 105°C-rated capacitors for consistent electrical performance.
- Its 140mm-long casing allows for easier fitment in a variety of PC cases, including smaller enthusiast builds.
- Fully modular cabling means you only connect the cables your system requires, reducing clutter.
Cons
- Some users have reported experiencing coil whine.
- The cables are plain rubber, which some users find less aesthetically pleasing than individually sleeved options.
- Uses non-Japanese capacitors, which some users consider a downgrade compared to the RMx series.
- The 7-year warranty is shorter than the 10-12 year warranties offered on some higher-end power supplies.
Dimension Scores
The 850-watt output combined with Cybenetics Gold efficiency (up to 90%) and ATX 3.1 compliance for 2x transient power excursions is above average for its category.
The 120mm rifle bearing fan with Zero RPM mode keeps noise low at light loads, and a calculated fan curve aims for quiet operation even at full load, though some users report coil whine.
It uses industrial-grade 105°C-rated capacitors and a robust resonant LLC topology with DC-DC conversion, indicating a solid internal build, despite some users noting non-Japanese capacitors.
The fully modular design significantly aids in cable management by allowing users to connect only necessary cables, and its 140mm length provides more space behind the PSU.
Best For
- New PC builds requiring ATX 3.1 and PCIe 5.1 compliance for modern GPUs.
- Compact PC cases where a 140mm PSU length is beneficial for cable management.
- Systems needing 850 watts of power with Cybenetics Gold efficiency.
- Users prioritizing fast wake-from-sleep times and better low-load efficiency with Modern Standby.
Not Recommended For
- Users who are highly sensitive to potential coil whine.
- Builders who prefer premium individually sleeved cables included out of the box.
- Those seeking the absolute longest warranty duration available in the PSU market.
Watch Out For
- Some users report coil whine, which can be an audible distraction in quiet environments.
- The included cables are standard rubber, not individually sleeved, which might necessitate purchasing aftermarket cable extensions for specific aesthetics.
- While 105°C-rated, the capacitors are not Japanese, a point of concern for some users comparing it to higher-tier PSUs.
Full Specifications
| ASIN | B0FLFDGTH7 |
| Brand | Corsair |
| Color | White |
| 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-9020293-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
The most surprising finding is the recurring mention of coil whine by some users, despite the PSU's focus on low-noise operation. Many users appreciate its readiness for new GPUs with the included 12V-2x6 cable and its compact size for easier installation. The 7-year warranty is seen as acceptable, though not top-tier. The plain rubber cables are a minor point of contention for those seeking a more premium aesthetic.
“Man, this thing just works, and the 12V-2x6 cable was a lifesaver for my new GPU, but I swear I hear a tiny hum sometimes. Still, it fits my small case perfectly.”
Common Praise
- Includes the 12V-2x6 cable, making it compatible with NVIDIA 40 Series GPUs without extra adapters.
- The 140mm length fits easily into various PC cases.
- Fully modular design simplifies cable routing and reduces clutter.
- Often described as quiet, especially at lower loads due to Zero RPM fan mode.
- Provides stable and reliable power delivery.
Common Complaints
- Some users report audible coil whine.
- Cables are standard rubber and not individually sleeved, which some find less appealing.
- Uses non-Japanese capacitors, which some users perceive as a cost-cutting measure compared to other Corsair lines.
- The 7-year warranty is shorter than the 10-12 year warranties on some competing PSUs.
Ownership Tips
- The 12V-2x6 cable is stiff, requiring careful bending and routing in smaller cases.
- Zero RPM fan mode actually keeps it silent during web browsing and light gaming, the fan only kicks in under heavier loads.
- The white finish looks clean in white-themed builds, but the cables are black, which can clash.
- Modern Standby works as advertised, waking the PC noticeably faster from sleep.
Frequently Asked Questions
Does this PSU come with the new 12V-2x6 cable for NVIDIA 40 Series GPUs?
Yes, it includes a native 12V-2x6 GPU power cable, making it ready for modern graphics cards without needing adapters.
Is this power supply quiet during operation?
It features a 120mm rifle bearing fan with a specially calculated fan curve and Zero RPM Fan Mode, which means the fan won't spin at lower loads for near-silent operation.
What is the efficiency rating of this power supply?
This power supply is Cybenetics Gold certified, offering up to 89-90% efficiency for lower power consumption and cooler temperatures.
What is the warranty period for the CORSAIR RM850e?
The CORSAIR RM850e comes with a seven-year warranty.
Will this PSU fit in smaller PC cases?
Yes, its compact 140mm-long casing is designed to ensure an easy fit in modern enthusiast PC cases.
Buying Guide
When picking a power supply, you're looking for something that can reliably deliver enough juice to all your components without making a racket or wasting electricity. Pay attention to the wattage, which needs to match or exceed your system's total power draw, and the efficiency rating, which tells you how much power is lost as heat. Modular cabling is a huge plus for keeping your build tidy.
Wattage (850 watts)
This is the maximum power your PSU can supply. Think of it like the horsepower of a car; you need enough to get where you're going, especially with powerful graphics cards and CPUs. 850 watts is plenty for most high-end gaming systems.
ATX 3.1 & PCIe 5.1 Ready
This means the PSU is built for the newest generation of PC hardware, particularly graphics cards. It can handle sudden, brief spikes in power demand (transient power excursions) that modern GPUs can create, preventing system instability. It also includes the specific 12V-2x6 connector these new GPUs use.
Cybenetics Gold Efficiency
This rating indicates how efficiently the PSU converts AC power from your wall outlet into DC power for your PC. Gold means it's at least 87% efficient at 20% load, 90% at 50% load, and 87% at 100% load. Higher efficiency means less wasted energy as heat, potentially lower electricity bills, and a cooler running system.
Fully Modular
This refers to the cables. A fully modular PSU lets you detach every single cable, so you only plug in the ones your system actually needs. This makes building your PC much cleaner, improves airflow, and simplifies future upgrades or troubleshooting compared to non-modular or semi-modular options.
Alternatives
If this doesn't fit, consider PSUs with higher efficiency ratings like Cybenetics Platinum or Titanium for even less wasted energy, or look for models with longer warranties if that's a priority.
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