Corsair RM850e (2023) Fully Modular Low-Noise Power Supply - ATX 3.1 & PCIe 5.1 Compliant - 105°C-Rated Capacitors - 80 Plus Gold Efficiency - Modern Standby Support - Black
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AI Verdict
This 850-watt, 80 Plus Gold, fully modular ATX 3.1 power supply is for PC builders needing modern GPU support and low fan noise.
This 850-watt, 80 Plus Gold, fully modular power supply with ATX 3.1 and PCIe 5.1 compliance is well-suited for modern PC builds. Its 105°C-rated capacitors and low-noise fan design align with expectations for reliable and relatively quiet operation.
If you need absolute silence or a longer warranty, look for PSUs with a 10-year warranty and larger, quieter fans (e.g., 135mm FDB fans) or higher-tier components.
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Pros
- Fully modular cabling simplifies system builds by allowing connection of only necessary cables.
- ATX 3.1 and PCIe 5.1 compliant, supporting current high-end GPUs with a native 12V-2x6 connector.
- 105°C-rated capacitors deliver steady electrical performance.
- A 120mm rifle bearing fan with a calculated curve aims for low noise, even at full load, and includes Zero RPM mode.
- Modern Standby support enables faster wake-from-sleep times and better low-load efficiency.
- Ranked #1 in Computer Power Supplies on Amazon.
Cons
- Some users report coil whine, particularly with specific GPU loads.
- Cables are described as stiff, potentially complicating routing in compact cases.
- The 7-year warranty is shorter than the 10-year warranty offered by some competing PSUs, including Corsair's own RMx series.
- Fan noise can be noticeable for some users, despite 'low-noise' claims.
Dimension Scores
Delivers 850 watts with 80 Plus Gold efficiency and ATX 3.1/PCIe 5.1 compliance, supporting modern high-power components.
Features a 120mm rifle bearing fan with Zero RPM mode for quiet operation at low loads, but some users report noticeable fan noise and coil whine at higher loads.
Utilizes 105°C-rated capacitors for reliable electrical performance and comes with a 7-year warranty.
Fully modular design allows for clean cable routing by only connecting necessary cables, though some users find the cables stiff.
Best For
- New PC builds featuring ATX 3.1 and PCIe 5.1 GPUs.
- Systems requiring 850 watts of power with 80 Plus Gold efficiency.
- Users prioritizing fully modular cabling for clean builds.
Not Recommended For
- Budget builds where 80 Plus Gold efficiency is not a priority.
- Users who prioritize a 10-year warranty over a 7-year warranty.
- Silence-focused builds where any potential coil whine or fan noise is unacceptable.
Watch Out For
- Coil whine has been reported by some users, with one user stating it 'sounds like somebody's drilling in the back of your PC'.
- Cables are noted to be stiff, which can make cable management challenging, especially in smaller cases.
- The 7-year warranty is shorter than the 10-year warranty found on some higher-tier PSUs, including Corsair's RMx series.
- Despite 'low-noise' claims, some users found the 120mm fan to be the loudest component in their system.
Full Specifications
| ASIN | B0BYQPH5J3 |
| Brand | Corsair |
| Color | Black |
| Series | RM850e |
| Voltage | 240 Volts |
| Wattage | 850 watts |
| Model Name | RM850e |
| Form Factor | ATX |
| Item Weight | 3.4 pounds |
| Manufacturer | Corsair |
| Connector Type | ATX |
| Cooling Method | Air |
| Output Wattage | 850 |
| Item model number | CP-9020263-NA |
| Compatible Devices | Personal Computer |
| Product Dimensions | 5.91 x 5.51 x 3.39 inches |
| Item Dimensions LxWxH | 5.91 x 5.51 x 3.39 inches |
| Item dimensions L x W x H | 5.91 x 5.51 x 3.39 inches |
What Buyers Say
The most surprising finding is the recurring complaint about noise, specifically coil whine or fan noise, despite Corsair's 'low-noise' marketing. Many users still find it a capable power supply for its price, especially with its ATX 3.1 and PCIe 5.1 compliance for modern GPUs. The fully modular design is consistently praised for simplifying builds and improving aesthetics. However, the perceived 'lower quality components' compared to the RMx series and the shorter 7-year warranty are points of contention for some.
“I bought this for my new 4070 build and the coil whine is driving me absolutely nuts, sounds like a tiny jet engine sometimes, definitely returning it for an RMx.”
Common Praise
- Fully modular design makes cable management easy and keeps cases tidy.
- Provides stable power delivery for high-end gaming PCs.
- ATX 3.1 and PCIe 5.1 compliance supports the latest graphics cards without adapters.
- Zero RPM fan mode keeps it silent under low loads.
- Good value for an 80 Plus Gold, 850W, fully modular unit.
Common Complaints
- Reports of coil whine, sometimes described as a 'drilling' sound.
- Fan can be loud for some users, even being the loudest component in their system.
- Cables are stiff, making them difficult to bend and route in some cases.
- 7-year warranty is shorter than the 10-year warranty on other Corsair PSUs like the RMx series.
- Some users perceive it as a 'cheaper' version of the RMx due to component choices (e.g., non-Japanese capacitors).
Ownership Tips
- The fan might not spin at all under low loads due to Zero RPM mode, contributing to silence.
- Cable stiffness becomes more apparent when trying to route them in smaller form factor cases.
- Coil whine seems to be load-dependent, often appearing with specific GPU loads.
- The native 12V-2x6 connector simplifies connecting modern GPUs, avoiding adapter clutter.
Frequently Asked Questions
Is this PSU compatible with NVIDIA 40-series GPUs?
Yes, it is PCIe 5.1 compliant and includes a native 12V-2x6 connector, making it ready for the latest high-end graphics cards like the RTX 40-series.
What does 'fully modular' mean?
Fully modular means you only connect the cables your PC build needs, which helps reduce cable clutter and improve airflow inside your case.
Is it quiet?
It features a 120mm rifle bearing fan with a calculated fan curve designed to keep noise down, even at full load, and includes a Zero RPM fan mode for silent operation at lower loads. However, some users have reported noticeable fan noise or coil whine.
What's the warranty?
Corsair provides a seven-year warranty for this power supply.
What is Modern Standby?
Modern Standby allows your PC to wake from sleep extremely fast and improves efficiency during low-load states.
Does it have Japanese capacitors?
The product features 105°C-rated capacitors for dependable electrical performance. Some users have noted that the RM850e may not use Japanese capacitors, unlike some higher-tier Corsair models.
Buying Guide
When picking a power supply, you need to match its wattage to your PC's components, especially your CPU and GPU, to ensure stable power. Efficiency ratings like 80 Plus Gold tell you how much power is wasted as heat; higher efficiency means less waste and potentially lower electricity bills. Fully modular designs let you connect only the cables you need, which makes building easier and keeps your case looking clean.
wattage
This number tells you the maximum power your PSU can deliver. If your PC components (like your graphics card and CPU) demand more power than your PSU can supply, your system will be unstable or won't even turn on.
80 Plus Gold Efficiency
This certification means the PSU converts at least 87% of AC power into DC power at 100% load, and 90% at 50% load. Higher efficiency means less energy wasted as heat, which can save you a bit on your electricity bill and keep your system cooler.
Fully Modular
A fully modular PSU lets you detach every cable that isn't needed. This drastically reduces cable clutter inside your PC case, improving airflow and making your build look much cleaner, like organizing your closet by only keeping clothes you actually wear.
ATX 3.1 & PCIe 5.1 Compliant
This ensures the power supply is built to handle the power demands and transient spikes of the newest graphics cards, like NVIDIA's RTX 40-series, and future-proofs your system against new power standards.
Alternatives
If this unit doesn't fit, look for PSUs with a 10-year warranty for extended peace of mind, or models with 135mm FDB fans if absolute silence is your top priority.
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