corsair rm850x vs rm850e

Corsair RM850x vs. RM850e: Which Elite PSU Will Power Your Next Gaming PC?

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Choosing Between Corsair RM850x and RM850e Power Supplies

When building or upgrading your gaming PC, selecting the right power supply unit (PSU) is critical for both performance and longevity. Two popular options from Corsair — the RM850x and RM850e — offer incredible features, 80 PLUS Gold certification, and exceptional reliability. In this Corsair RM850x vs RM850e comparison, we’ll break down each model’s specifications, advantages, and their compatibility with next-gen GPUs, including the NVIDIA RTX 50 Series, such as the RTX 5080, and RTX 5070 Ti

Corsair RM850x vs RM850e: Comprehensive Comparison

Feature Corsair RM850x Corsair RM850e
Power Output
850W
850W
80 PLUS Certification
Gold
Gold
Cybenetics Certification
Efficiency: Gold

Noise: A
Efficiency: Gold

Noise: A–
ATX Version
ATX 3.1
ATX 3.1
PCIe 5.0 / 12VHPWR Cable
Native 12VHPWR (12+4 pin) included
Native 12VHPWR (12+4 pin) included
Modern Standby Support
Yes
Yes
Fan Size & Type
140mm Magnetic Levitation fan
120mm Rifle Bearing fan
Zero RPM Fan Mode
Yes
Yes
Capacitors
100% Japanese 105°C capacitors
105°C-rated industrial-grade capacitors
Modular Design
Fully modular
Fully modular
Form Factor
ATX, 160mm length
ATX, shorter 140mm length
SATA Connectors
8
7
PATA (Molex) Connectors
3
4
PCIe Connectors
3
3
EPS Connectors
2
2
Warranty
10 Years
7 Years
Weight
3.28 lbs
2.738 lbs
Best For
Enthusiasts wanting max cooling, silence, and longevity
Compact builds & next-gen GPUs with budget in mind
Price
Check out on Amazon!
Check out on Amazon!

TL;DR:​

  • Choose the RM850x if you prioritize premium components, a longer warranty, and a larger fan for quieter operation.
  • Choose the RM850e if you need a more compact PSU with full ATX 3.1 and PCIe 5.1 support, suitable for next-gen GPUs and tighter builds.​

Why is Your PSU So Important?

A PSU converts AC (Alternating Current) into the necessary DC (Direct Current) that powers the essential components of your gaming PC, including the CPU, GPU, and storage drives. Choosing a high-quality PSU ensures:

  • Stable Power Delivery: Prevents system crashes or damage.
  • Efficiency: Reduces energy waste, lowers electricity bills, and cools the system.
  • Reliability: A durable PSU ensures your components are powered safely for years.
  • Low Noise: Premium PSUs like the RM850x and RM850e feature silent operation for quiet gaming sessions.

Both the Corsair RM850x and Corsair RM850e are solid choices, offering high efficiency, longevity, and quiet operation, but which one is best for your gaming PC build? Let’s dive deeper into their features.

Corsair RM850x: Quiet Powerhouse Built to Last

The Corsair RM850x is a top-tier PSU designed for builders who want quiet, long-lasting performance. It’s built with 100% Japanese 105°C capacitors, a 140mm magnetic levitation fan for ultra-low noise, and supports Modern Standby for near-instant wake times and better power efficiency.

It’s fully ATX 3.1 and PCIe 5.1 compliant, making it ideal for modern GPUs like the RTX 5070 Ti/5080 cards that require 12VHPWR (12+4 pin) power delivery.

Ideal For:

  • Silent builds with airflow-focused cases
  • High-end gaming systems and workstations
  • Future-proofing with 10-year warranty

Corsair RM850e: Compact, Cost-Effective, Next-Gen Ready

The Corsair RM850e is the newer, more affordable sibling to the RM850x. Despite its smaller footprint (just 140mm in length), it still supports ATX 3.1, includes the 12VHPWR cable, and delivers 850W of reliable power using industrial-grade capacitors.

Its 120mm rifle bearing fan is slightly noisier under load than the RM850x, but for many users this won’t be a noticeable issue — especially in well-ventilated or closed-case systems.

Ideal For:

  • Budget-conscious builders who want ATX 3.1 and PCIe 5.1
  • Compact mid-tower or mini-tower builds
  • Gamers upgrading to RTX 50 series GPUs

RM850x vs RM850e: Key Differences

Noise & Cooling:

  • RM850x has a larger, quieter magnetic levitation fan (140mm) with an “A” Cybenetics rating.
  • RM850e uses a 120mm rifle bearing fan and gets an “A–” rating.

Size:

  • RM850x is 160mm long (standard full-size).
  • RM850e is shorter at 140mm, better for tighter cases.

Cable Quality:

  • RM850x offers sleeved, low-profile cables — easier to route and better aesthetics.
  • RM850e comes with flat cables — functional but slightly harder to manage.

Warranty:

  • RM850x: 10 Years
  • RM850e: 7 Years

Compatibility with NVIDIA RTX 50 Series GPUs

Powering the Next-Gen RTX 50 Series

The NVIDIA RTX 50 Series GPUs, such as the RTX 5080, and RTX 5070 Ti require a robust and reliable PSU to meet their power demands.

  • RTX 5080: 360W TGP – Works well with an 850W PSU like the RM850x or RM850e.
  • RTX 5070 Ti: 300W TGP – An 850W PSU is sufficient for this GPU.

The Corsair RM850x and Corsair RM850e are fully compatible with the RTX 5070 Ti and RTX 5080. However, for the RTX 5090, a 1000W PSU like the Corsair RM1000x is recommended for maximum stability.

Which One Should You Choose?

Use Case Recommended PSU
Silent operation & premium internals
RM850x
Small case or compact build
RM850e
Best long-term value & 10-year warranty
RM850x
Saving money but still future-ready
RM850e
Running RTX 50 series GPUs
Either (both support 12VHPWR)

Final Thoughts & Buying Advice

Both PSUs are excellent, next-gen ready solutions that meet the rigorous ATX 3.1 and PCIe 5.1 standards, including the native 12VHPWR connector required for cards like the RTX 5080 and RTX 5070 Ti.

For most gamers and creators, the RM850x offers better cooling, lower noise, and peace of mind with a 10-year warranty. But if you’re optimizing for space or value without sacrificing GPU compatibility, the RM850e is a solid, future-proof choice.

Pro Tip: Pair either PSU with a power-efficient motherboard and take advantage of Modern Standby for lightning-fast boot and wake times!

RM850x vs RM850e - FAQs

Is the Corsair RM850x better than the RM850e?

Yes, the RM850x offers superior features such as a quieter magnetic levitation fan, 100% Japanese capacitors, and a longer 10-year warranty, making it a premium choice over the RM850e.

The RMx series, including the RM850x, is designed for ultra-low noise and premium build quality, while the RMe series, like the RM850e, offers a more compact design and cost-effective solution.

Yes, both power supplies are compatible with NVIDIA RTX 5070 Ti and RTX 5080 GPUs, as they include the native 12VHPWR (12+4 pin) PCIe 5.1 connector required for these high-power graphics cards.

Yes, the refresh of the RM850x supports ATX 3.1 and PCIe 5.1 standards, making it fully ready for RTX 50 series (5070 Ti, 5080) GPUs.

ATX 3.1 is the latest power supply standard that includes better power excursion handling, native 12VHPWR support, and improved energy efficiency under low load, ensuring stability for next-gen GPUs like the RTX 50 series.

Yes, the RM850e is a solid PSU for gaming, delivering 850W of reliable power, supporting Modern Standby, and being ATX 3.1 compliant, making it suitable for gamers upgrading to the latest graphics cards.

The RM850x comes with a 10-year warranty, while the RM850e includes a 7-year warranty, providing long-term coverage for both options.

Note: This page is updated frequently as we continue researching and reviewing products throughout the year. The opinions and recommendations provided on this page are based on extensive online research and available product information. While we aim to provide accurate and helpful insights, it’s important to note that everyone’s needs and preferences are different. What we believe may be a good option for some may not be the best choice for others. We always encourage you to do your own research and consider your unique needs before making any purchase decisions.

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