CORSAIR RMX Series, RM850x, 850 Watt, 80+ Gold Certified, Fully Modular Power Supply
*Price sourced from Amazon.com. Last updated 2026-07-06. Price and availability subject to change.
Bottom line: The CORSAIR RMX Series, RM850x, 850 Watt, 80+ Gold Certified, Fully Modular Power Supply is a niche pick — read recent reviews before buying in the power supplies category, priced around $209.99. Read recent reviews carefully before committing.
Corsair RM850x High Performance Power Supply. Corsair RMx series power supplies give you extremely tight voltage control quiet operation Gold-certified efficiency and a fully modular cable set. Built with all Japanese 105 C capacitors theyre a great choice for high performance PCs where reliability is essential. 80 PLUS Gold efficiency reduces operating cost and excess heat and Zero RPM fan mode ensures virtual silence at low and medium loads. And the fully modular DC cables make builds and upgrades easy with clean great-looking results.
SpecPicks Verdict
SpecPicks classifies CORSAIR RMX Series, RM850x, 850 Watt, 80+ Gold Certified, Fully… as a niche pick — read recent reviews before buying in the power supplies category, based on our editorial and benchmark analysis and our ranking model that weights rating × review-volume × price-fit. Use the Compare tool to put it side-by-side with two or three close alternatives before clicking through to Amazon.
Common buyer scenarios for power supplies of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.
Pros & Cons
Pros
- ✓ Zero RPM Fan Mode: Virtually silent operation at low and medium loads
- ✓ Ships via Amazon with Prime eligibility and the standard returns policy
Cons
- ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
- ✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified
Key Features
- 80 PLUS Gold certified: High efficiency operation for less excess heat and lower operating costs
- 100% All Japanese 105 capacitors: Premium internal components ensure solid power delivery and long term reliability
- Zero RPM Fan Mode: Virtually silent operation at low and medium loads
- Fully Modular: Make your builds and upgrades easy, with clean, great-looking results
- Ten year warranty: Your guarantee of reliable operation that will last across several system builds
Full Specifications
| Brand | Corsair |
|---|---|
| Wattage | 850 watts |
| Fan Size | 135 Millimeters |
| Model Name | rmx series |
| Unit Count | 1.0 Count |
| Form Factor | ATX12V |
| Model Number | CP-9020093-NA |
| Fully Modular | Make your builds and upgrades easy, with clean, great-looking results |
| Built-In Media | rm850x |
| Connector Type | ATX, EPS |
| Cooling Method | Air |
| Number of Fans | 1 |
| Output Wattage | 850 Watts |
| Item Dimensions | 7.08 x 3.38 x 5.9 inches |
Ready to buy?
CORSAIR RMX Series, RM850x, 850 Watt, 80+ Gold Certified, Fully Modular Power Supply is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-07-06. Price and availability subject to change.
Related Power Supplies
More guides & deep dives from the SpecPicks archive
Browse all articles & guides →- How to Build a Windows 98 Retro PC in 2026
- Emulation Hardware in 2026: FPGA, Software, and Cart-Reader Ecosystems
- Best Budget Gaming PC Build 2026 — ~$1,000 ($800 on Sale)
- The Complete Voodoo5 5500 AGP Driver Guide (2026 Edition)
- Best Retro Handhelds in 2026 — From $35 to $500
- Best 1440p Gaming GPUs in 2026
- RTX 4070 Super vs RX 7800 XT — Which to Buy in 2026
More reviews from the SpecPicks archive
Browse all reviews →- UT99 OldUnreal 469 Patch in 2026: Migration, Servers, and Period-Correct Controller Mapping
- A 3D-Printed Switch Steering Wheel V2 Brings Adaptive Racing to More Players
- Best GPU for Llama 3.1 405B (2026)
- Shared ChatGPT and Claude Chat Links Are Spreading Malware (And Local LLMs Fix It)
- Voodoo3 3000 PCI Install Guide for Win98 SE in 2026
- Gemini 3.5 Flash vs Local LLMs on a 12GB GPU: When Cloud Wins
- Best Gaming PC Upgrades Under $200 in 2026: 5 Picks That Move the Needle
- Building a Period-Correct 2003 WinXP Gaming Rig with Sound Blaster Audigy and a Modern 8BitDo Controller
- Linux Driver Will Expose Voltage Inputs on Raspberry Pi SBCs
- Do You Even Need a Graphics Card? Ryzen 5 5600G iGPU vs RTX 3060 for 1080p
- Why AI Memory Bandwidth Matters: From Micron's HBM to Your GDDR6
- Gemma 4 12B Speech-to-Text on an RTX 3060 12GB: Local Transcription tok/s
- Best Streaming Gear for New Creators in 2026
- Best Budget Ryzen Gaming PC Build for 1080p in 2026
- Best CPU Cooler for High-TDP Builds (2026)
- Samsung 256GB microSD Drops to $47.99 — 40% Off Storage Deal
- CompactFlash as Your IDE Hard Drive: A Silent, Reliable Retro PC Boot Disk
- Grok Imagine 1.5 Brings 720p Image-to-Video — Can You Run It Locally?
- Sound Blaster AWE64 vs Aureal Vortex 2: The Win98 Audio API War, Revisited
- Best AMD Ryzen 5000 CPU for Gaming in 2026: 5 Picks
- Fix Windows 98 SE on 1GB+ RAM: The Vcache Gotcha
- Building a 2001 Pentium III + GeForce 3 Win98SE Gaming Rig: A 2026 Build Log
- AMD Ryzen AI Max+ 'Gorgon Halo' 192GB: What 192GB Unified Memory Means for Local LLMs
- Blue Yeti vs HyperX QuadCast 2 S: Best USB Mic for Streaming in 2026