Corsair RM850x Fully Modular Low-Noise Alternatives: 6 Similar Picks Compared
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
You are looking for corsair rm850x fully modular low noise alternatives to match your specific build needs. The Corsair RM850x delivers 850W of power with ATX 3.1 compliance and PCIe 5.1 support. It features a Cybenetics Gold efficiency rating and a 12V-2x6 connector. These specs make it a strong choice for standard modern ATX builds. However, you might prefer a different brand, color, or warranty length. Some builders need a smaller footprint or a specific fan size for their chassis. Others may want a 750W unit if their components do not require full 850W capacity. The alternatives listed here were chosen because their specifications overlap with the original. Each option maintains core compatibility while offering distinct advantages. You will find variations in efficiency standards, physical dimensions, and included features. This guide compares 6 similar picks to help you find the best fit. We focus strictly on the published data to ensure an accurate comparison. Your decision should depend on which specs matter most for your setup.
Our top pick: Corsair RM850x 850W Fully Modular ATX 3.1 PSU.
How these options differ
MSI MPG 850W Gold ATX 3.1 Power Supply
The MSI MPG 850W Gold offers 100% Japanese capacitors and a 10-year warranty, providing longer coverage than the Corsair RM850x. It uses a 12V-2x6 connector and maintains ATX 3.1 compliance for modern GPUs. However, it is significantly heavier at 7.15 pounds compared to the Corsair’s 3.9 pounds. You get standard 80 Plus Gold efficiency rather than the Cybenetics Gold rating found in the original. This unit suits builders who prioritize component quality and warranty length over weight and specific efficiency certifications.
Auotac 850W ATX 3.1 Fully Modular PSU
The Auotac 850W PSU distinguishes itself with ARGB lighting and a white color scheme, unlike the black Corsair RM850x. It also weighs less at 3.2 pounds, making it lighter for your build. It provides 80 Plus Gold efficiency and a 10-year warranty, extending coverage beyond the Corsair’s standard term. The unit includes cable markers for easier installation. You choose this alternative if you want visual customization and a lighter chassis, accepting a slightly larger footprint of 6 by 6 inches compared to the Corsair’s compact dimensions.
Corsair RM850x Shift 850W White ATX Power Supply
The Corsair RM850x Shift features a right-angle connector design, changing how cables exit the unit compared to the standard straight connectors on the original RM850x. It is white, offering a different aesthetic for white-themed builds. Efficiency remains at 80 Plus Gold, which is slightly lower than the Cybenetics Gold rating of the original. It shares the same 850W capacity and PCIe 5.1 support. This model is ideal if you need compact cable management in tight spaces or prefer a white finish, while maintaining the same brand reliability.
Thermaltake Toughpower GX3 850W Gold PSU
The Thermaltake Toughpower GX3 uses a 120mm fan, which is larger than the cooling solution in the Corsair RM850x. This may offer different acoustic characteristics for low-noise builds. It provides 80 Plus Gold efficiency and a 5-year warranty, which is shorter than the Corsair’s coverage. It includes a 12V-2x6 connector for PCIe 5.1 GPUs. You might select this unit if you prefer a standard fan size for easier replacement or specific airflow requirements. It lacks the Cybenetics certification of the original but offers robust ATX 3.1 compliance.
MSI MAG A750GL PCIE5 750W Power Supply
The MSI MAG A750GL reduces capacity to 750W, which may not suit high-end GPUs requiring full 850W headroom. It offers a 10-year warranty, exceeding the Corsair RM850x coverage. It features a fully modular design and ATX 3.1 compliance with a 12V-2x6 connector. This unit is lighter and smaller in some dimensions but heavier in others. You should pick this alternative only if your power needs are lower than 850W. It provides 80 Plus Gold efficiency, trading the Cybenetics rating of the original for potentially broader availability at lower wattage.
ASRock Steel Legend White 850W ATX 3.1 PSU
The ASRock Steel Legend White includes a 135mm fan, providing larger cooling surface area than the Corsair RM850x. It is white, offering a distinct aesthetic choice. It delivers 80 Plus Gold efficiency and a 10-year warranty, extending protection beyond the original. The unit is fully modular with PCIe 5.1 support. It is heavier at 6.59 pounds compared to the Corsair’s 3.9 pounds. This option suits builders who prioritize larger fans for quiet operation and white aesthetics, accepting the weight increase and different efficiency certification for potentially better thermal performance.
Quick picks
Our 7 picks
Corsair RM850x 850W Fully Modular ATX 3.1 PSU
Best for: standard modern ATX builds needing PCIe 5.1
- Wattage
- 850W
- Efficiency Rating
- Cybenetics Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
- PCIe Version
- PCIe 5.1
View on Amazon: Corsair RM850x 850W Fully Modular ATX 3.1 PSU
The Corsair RM850x is an 850W fully modular ATX power supply built to modern standards. It features ATX 3.1 compliance, PCIe 5.1 support, and a dedicated 12V-2x6 power connector for current graphics cards. With its Cybenetics Gold efficiency rating, this unit suits you if you want a reliable base specification for a desktop build without excess cable clutter inside your PC case.
Pros
- ATX 3.1 compliant with PCIe 5.1 support
- Native 12V-2x6 power connector
- Fully modular cable system
- Cybenetics Gold efficiency level
Cons
- Standard ATX size limits use in compact SFX enclosures
- Only available in black
Good fit if
- You need native 12V-2x6 PCIe 5.1 connectivity for modern graphics hardware.
- You want a fully modular 850W unit with Cybenetics Gold efficiency.
Skip if
- You need an SFX power supply for a small-form-factor case.
- You are planning an all-white PC build.
Verdict: Corsair RM850x 850W ATX 3.1 PSU sets the benchmark for modern 850W builds with its full modularity, Cybenetics Gold rating, and updated PCIe 5.1 connector.
MSI MPG 850W Gold ATX 3.1 Power Supply
Best for: builders wanting Japanese capacitors and ATX 3.1
- Wattage
- 850W
- Efficiency Rating
- 80+ Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
- Warranty
- 10 Year
The MSI MPG 850W Fully Modular PSU delivers 850 watts of power with 80 Plus Gold efficiency. Built to ATX 3.1 and PCIe 5.1 specifications, it features a native 12V-2x6 connector for modern graphics cards and all-Japanese 105°C capacitors. Its fully modular cabling lets you attach only the lines your build requires. This unit suits you if you need a reliable, standard-dimension power supply backed by a 10-year warranty.
Pros
- ATX 3.1 and PCIe 5.1 compliant with native 12V-2x6 connector
- 100% Japanese 105°C capacitors
- 80 Plus Gold efficiency certification
- 10-year limited warranty coverage
Cons
- Standard 80 Plus Gold rating rather than higher Platinum tiers
- Total weight of 7.15 pounds adds heft to your case
Good fit if
- You need a native 12V-2x6 cable for modern PCIe 5.1 hardware.
- You want Japanese 105°C capacitors with a 10-year warranty.
- You prefer fully modular cables to simplify cable routing.
Skip if
- You require an efficiency certification higher than 80 Plus Gold.
- You need more than 850W of power for high-draw hardware configurations.
Verdict: MSI MPG 850W Fully Modular PSU combines ATX 3.1 compliance, 100% Japanese capacitors, and a 10-year warranty. Its fully modular layout and native 12V-2x6 connector provide reliable power delivery for current builds.
Auotac 850W ATX 3.1 Fully Modular PSU
Best for: ARGB builds requiring modern ATX 3.1 connectivity
- Wattage
- 850W
- Efficiency Rating
- 80 PLUS Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
- Fan Size
- 140mm
This 850W fully modular power supply offers an alternative to standard units with ATX 3.1 and PCIe 5.1 compliance. It delivers 80 PLUS Gold efficiency and features a 140mm silent-mode fan with ARGB lighting. You get a native dual-color 12V-2x6 connector for modern graphics cards, 105°C Japanese capacitors, and an included PSU tester. It suits your build if you want high-wattage hardware support with customizable internal lighting.
Pros
- Native dual-color 12V-2x6 connector with ATX 3.1 and PCIe 5.1 support
- 140mm low-noise fan with silent mode and ARGB lighting
- 100% Japanese 105°C electrolytic capacitors
- 10-year limited warranty
- Includes 24-pin starter PSU tester, cable combs, and ties
Cons
- Available only in an 850W capacity
- Dragon-pattern cable exterior may clash with minimalist builds
Good fit if
- You need native PCIe 5.1 power delivery with visual seating indicators
- You want customizable ARGB fan illumination inside your chassis
- You prefer having an included testing starter and management combs
Skip if
- You want an unlit, stealth-look power supply without RGB
- You need a wattage tier other than 850W
Verdict: Auotac 850W ATX 3.1 Fully Modular Power Supply delivers modern GPU connectivity, quiet cooling, and ARGB flair backed by a 10-year warranty. It provides solid specs for builders wanting low noise and clear cable installation markers.
Corsair RM850x Shift 850W White ATX Power Supply
Best for: white ATX 3.1 low-noise desktop builds
- Wattage
- 850W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- PCIe 5.1
- Dimensions
- 6.3 × 5.91 × 3.39 inches
View on Amazon: Corsair RM850x Shift 850W White ATX Power Supply
The Corsair RM850x Shift 850W White Power Supply is a fully modular unit built for modern desktop systems. It provides 850W of power with an 80 Plus Gold efficiency certification, meeting ATX 3.1 and PCIe 5.1 standards. With a Zero RPM mode and a 6.3-inch length, this power supply suits you if you want modern standard compliance and silent operation under light workloads inside an ATX case.
Pros
- ATX 3.1 and PCIe 5.1 support for current hardware
- 80 Plus Gold certified energy efficiency
- Zero RPM mode for fanless operation at low loads
- Fully modular cabling configuration
Cons
- Chassis length measures 6.3 inches rather than compact 5.5 inches
- Offered specifically in a white finish
- 80 Plus Gold efficiency rather than Platinum or Titanium tier
Good fit if
- You need native ATX 3.1 and PCIe 5.1 power delivery for your graphics hardware.
- You want a fully modular 850W unit that stops its fan during light operation.
- You are building a desktop around white components.
Skip if
- You have a small case requiring a power supply shorter than 6.3 inches.
- You require an efficiency rating higher than 80 Plus Gold.
- You need a standard black enclosure for your case theme.
Verdict: Corsair RM850x Shift 850W White Power Supply delivers ATX 3.1 and PCIe 5.1 support alongside 80 Plus Gold efficiency. It provides low-noise operation and fully modular cable management for standard ATX configurations.
Thermaltake Toughpower GX3 850W Gold PSU
Best for: ATX 3.1 builds wanting a 120mm fan
- Wattage
- 850W
- Efficiency Rating
- 80 Plus Gold
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
- Fan Size
- 120mm
- Warranty
- 5 Year
The Thermaltake Toughpower GX3 850W delivers 80 Plus Gold efficiency and full compliance with ATX 3.1 standards. It features a native 12V-2x6 PCIe 5.1 connector, flat cables, and a 120mm fluid dynamic bearing fan. This unit suits you if you need a reliable 850W supply for modern hardware that prioritizes ATX 3.1 compatibility and a standard 120mm fan footprint over modular cable management.
Pros
- Native PCIe 5.1 12V-2x6 connector
- Compliant with ATX 3.1 specifications
- 80 Plus Gold certified efficiency
- 120mm fluid dynamic bearing fan
Cons
- Fixed flat cables instead of fully modular connections
- Limited to a 5-year warranty
Good fit if
- You want native PCIe 5.1 and ATX 3.1 power delivery.
- You prefer a power supply with a 120mm fluid dynamic bearing fan.
- You are comfortable managing fixed flat cables in your enclosure.
Skip if
- You need fully modular cabling to eliminate unused wires.
- You want a warranty longer than 5 years.
Verdict: Thermaltake Toughpower GX3 850W Gold PSU provides ATX 3.1 compliance and native PCIe 5.1 connectivity in an 80 Plus Gold platform. It works well if you want modern standard-dimension 120mm fan cooling without requiring modular cables.
MSI MAG A750GL PCIE5 750W Power Supply
Best for: 750W ATX 3.1 gaming builds
- Wattage
- 750W
- Efficiency Rating
- 80 PLUS Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
- Warranty
- 10 Year
The MSI MAG A750GL PCIE5 is an ATX 3.1 power supply delivering 750W with 80 PLUS Gold efficiency. It features fully modular cabling and a dedicated native PCIe 5.1 12V-2x6 connector for modern graphics cards. A 10-year warranty backs its internal components. If your build needs reliable ATX 3.1 standards and modular cable routing without requiring a full 850W capacity, this unit covers your power delivery requirements cleanly.
Pros
- Native PCIe 5.1 12V-2x6 connector included
- Fully modular cable design
- 80 PLUS Gold certified efficiency
- 10-year limited manufacturer warranty
Cons
- 750W capacity is lower than standard 850W alternatives
- Offered only in black finish
Good fit if
- You need ATX 3.1 and PCIe 5.1 compliance for your GPU.
- You want fully modular cables inside a standard ATX enclosure.
- You run hardware configurations that stay comfortably within 750W.
Skip if
- You need an 850W or higher power ceiling for demanding components.
- You want a white chassis for your build.
Verdict: MSI MAG A750GL PCIE5 750W Gold Power Supply gives you modern ATX 3.1 compliance and a 10-year warranty in a compact, fully modular design. It provides a dependable alternative when your setup does not require a full 850W capacity.
ASRock Steel Legend White 850W ATX 3.1 PSU
Best for: white-themed ATX 3.1 builds wanting quiet operation
- Wattage
- 850W
- Efficiency Rating
- 80 PLUS Gold, Cybenetics Platinum
- Modularity
- Full Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
- Fan Size
- 135 mm
This is an 850W fully modular ATX power supply tailored for modern GPU setups. It meets ATX 3.1 standards with a dedicated PCIe 5.1 12V-2x6 connector rated for 105 degrees Celsius. For thermal control, it relies on a 135 mm fluid dynamic bearing fan with iCOOL intelligent fan control. It suits you if you need Gold efficiency, high-load GPU cabling, and quiet cooling inside an ATX case.
Pros
- ATX 3.1 standard with PCIe 5.1 12V-2x6 connector
- 135 mm fluid dynamic bearing fan with iCOOL control
- 80 PLUS Gold and Cybenetics Platinum efficiency
- 10-year global manufacturer warranty
Cons
- Not compatible with all built-in or prebuilt computer systems
- White theme limits aesthetic pairing in dark cases
Good fit if
- You need ATX 3.1 hardware with a native 12V-2x6 GPU cable.
- You want a 135 mm FDB fan with intelligent thermal regulation.
- You are building a white or light-colored desktop system.
Skip if
- You use a prebuilt PC case with non-standard power supply mounts.
- You prefer an all-black finish for your chassis interior.
Verdict: ASRock Steel Legend White 850W ATX 3.1 PSU provides 850 watts of fully modular power, modern PCIe 5.1 cabling, and quiet 135 mm cooling backed by a 10-year warranty. It serves as a dependable low-noise alternative for compatible ATX desktop chassis.
Specifications side by side
| Spec | Corsair RM850x 850W Fully Modular ATX 3.1 PSU | MSI MPG 850W Gold ATX 3.1 Power Supply | Auotac 850W ATX 3.1 Fully Modular PSU | Corsair RM850x Shift 850W White ATX Power Supply | Thermaltake Toughpower GX3 850W Gold PSU | MSI MAG A750GL PCIE5 750W Power Supply | ASRock Steel Legend White 850W ATX 3.1 PSU |
|---|---|---|---|---|---|---|---|
| Wattage | 850W | 850W | 850W | 850W | 850W | 750W | 850W |
| Efficiency Rating | Cybenetics Gold | 80+ Gold | 80 PLUS Gold | 80 Plus Gold | 80 Plus Gold | 80 PLUS Gold | 80 PLUS Gold, Cybenetics Platinum |
| Modularity | Fully Modular | Fully Modular | Fully Modular | Fully Modular | not specified | Fully Modular | Full Modular |
| ATX Version | ATX 3.1 | ATX 3.1 | ATX 3.1 | ATX 3.1 | ATX 3.1 | ATX 3.1 | ATX 3.1 |
| PCIe Connector Type | 12V-2x6 | 12V-2x6 | 12V-2x6 | PCIe 5.1 | 12V-2x6 | 12V-2x6 | 12V-2x6 |
| Fan Size | not specified | not specified | 140mm | not specified | 120mm | not specified | 135 mm |
| Warranty | not specified | 10 Year | 10-Year | not specified | 5 Year | 10 Year | 10 Years |
| Form Factor | ATX | ATX | ATX | ATX | ATX | ATX | ATX |
| PCIe Version | PCIe 5.1 | PCIe 5.1 | PCIe 5.1 | PCIe 5.1 | PCIe 5.1 | PCIe 5.1 | not specified |
| Recommended Use | not specified | Gaming | not specified | not specified | not specified | Gaming | not specified |
| Connector | 12V-2x6 Connector | 12V-2x6 Connector | 12V-2x6 Connector | not specified | 12V-2x6 Connector | 12V-2x6 Connector | 12V-2x6 Connector |
| Size | 850W | 850W | 850W | 850W | 850W | 750W (PCIE 5) | 850W |
| Dimensions | 2.3 × 3.39 × 5.91 inches | 5.91 × 5.91 × 3.39 inches | 6 × 6 × 3.7 inches | 6.3 × 5.91 × 3.39 inches | 5.9 × 5.5 × 3.4 inches | 12 × 9 × 5 inches | 5.91 × 5.91 × 3.39 inches |
| Weight | 3.9 pounds | 7.15 pounds | 3.2 pounds | 3.75 pounds | not specified | 6.61 pounds | 6.59 pounds |
| Color | Black | not specified | White | White | Black | Black | Multicolor |
| Model | not specified | MPG A850G PCIE 5 | not specified | not specified | PS-TPD-0850NNFAGU-3 | 306-7ZP8B11-CE0 | SL-850GW |
If you need a PC case to house your components, compare specs for corsair 4000d rs argb frame alternatives.
Frequently asked questions
Which Corsair RM850x alternative has the lowest weight?
The Auotac 850W ATX 3.1 Fully Modular PSU is the lightest option at 3.2 pounds. It provides 850W of power with full modularity and ATX 3.1 compliance. This makes it easier to handle during installation compared to heavier units like the MSI MPG 850W, which weighs 7.15 pounds.
Do these power supplies support the latest GPU connectors?
Yes, all listed options include the 12V-2x6 connector for PCIe 5.1 compatibility. This allows you to connect modern graphics cards without needing adapters. The Corsair RM850x, MSI MPG, and Auotac units all feature this native connector alongside their ATX 3.1 standards.
Which unit uses a 120mm fan for cooling?
The Thermaltake Toughpower GX3 850W Gold PSU features a 120mm fan. This larger fan size can contribute to quieter operation at lower speeds. Most other alternatives in this list use standard fan sizes, but the Thermaltake design offers a specific cooling profile for low-noise builds.
Are there fully modular options in white?
Yes, the Corsair RM850x Shift and the Auotac 850W ATX 3.1 are both fully modular and available in white. The Corsair Shift measures 6.3 inches in length, while the Auotac is slightly smaller at 6 inches. Both provide full cable management for clean white-themed builds.
What is the smallest wattage option available?
The MSI MAG A750GL PCIE5 is the lowest wattage option at 750W. It is fully modular and supports ATX 3.1 and PCIe 5.1. This makes it a suitable choice if your system does not require the full 850W capacity provided by the other units in this comparison.
Which power supply has the longest physical length?
The MSI MAG A750GL has the longest length at 12 inches. This is significantly longer than the standard 850W units, which typically measure around 5.91 to 6.3 inches. You should check your case compatibility carefully before choosing this model due to its extended dimensions.
Do these units support ATX 3.1 standards?
Yes, every power supply listed supports ATX 3.1 compliance. This ensures compatibility with the latest motherboard specifications and power delivery requirements. The Corsair RM850x, MSI MPG, Auotac, and other models all adhere to this standard for reliable performance in modern systems.