SilverStone Extreme 850W Platinum SFX Alternatives: 6 Similar Picks Compared
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You are looking for silverstone technology extreme 850r platinum alternatives to power a compact build. The original unit delivers 850W in a small SFX form factor with Cybenetics Platinum efficiency and ATX 3.0 support. It includes a 12VHPWR connector for modern graphics cards and operates quietly with a 92mm fan. This makes it ideal for small form factor cases where space is tight.
You might want something else if you need a standard ATX size, a different efficiency rating, or a lower price point. This list includes 6 similar picks that share key specifications like 850W output, modular design, and support for recent PCIe standards. Each alternative overlaps with the original in critical areas such as wattage, connector compatibility, and form factor flexibility. We selected these options because their published specs align with your potential needs, whether you prioritize Titanium efficiency, ATX 3.1 compliance, or simply a different brand. Use this guide to compare the technical details and find the right fit for your system.
Our top pick: SilverStone Extreme 850W Platinum SFX PSU.
How each alternative compares
be quiet! Dark Power 13 850W Titanium PSU
The be quiet! Dark Power 13 offers 80 Plus Titanium certification, which exceeds the Cybenetics Platinum rating of the SilverStone unit. This provides higher efficiency at typical loads. It uses standard ATX dimensions, measuring 5.91 by 6.89 inches, so it does not fit small form factor cases. It supports ATX 3.0 and includes the necessary PCIe 5.0 connectors. Choose this if you prioritize peak efficiency and have a standard ATX case. You lose the compact size and the specific SFX mounting flexibility of the SilverStone Extreme.
Montech Century G5 850W Power Supply
The Montech Century G5 850W provides 80 Plus Gold efficiency, which is lower than the SilverStone’s Platinum rating. It uses a standard ATX form factor, making it incompatible with SFX chassis. It is fully modular and supports ATX 3.0 standards. This unit is a practical alternative for builders who do not need the highest efficiency tier or the smallest footprint. It fits standard cases where size is not a constraint. You gain a potentially lower cost option but sacrifice the compact dimensions and superior efficiency certification of the original SilverStone model.
Apevia Soul 850W ATX 3.1
The Apevia Soul 850W supports ATX 3.0 and PCIe 5.1 standards with a 12V-2x6 connector. It uses a standard ATX size, measuring 5.9 by 6.2 inches. It is fully modular and includes active PFC. This unit is suitable for standard ATX builds that require modern connector support. It does not offer the compact SFX form factor of the SilverStone Extreme. You trade the small size and high efficiency rating for a standard form factor and potentially more budget-friendly pricing. It is a solid choice for non-SFF systems.
Corsair RM850x Shift 850W White ATX Power Supply
The Corsair RM850x Shift supports ATX 3.1 and PCIe 5.1 standards. It uses a standard ATX form factor with dimensions of 5.91 by 6.3 inches. It is fully modular and carries an 80 Plus Gold efficiency rating. This unit is ideal for standard ATX builds needing the latest connectivity standards. It lacks the compact SFX size of the SilverStone unit. You gain ATX 3.1 compliance and a white color option but lose the small footprint and higher Platinum efficiency. It is best for standard cases where size is not a limiting factor.
Corsair RM1000x Shift 1000W Power Supply
The Corsair RM1000x Shift provides 1000W of power, which is higher than the 850W output of the SilverStone Extreme. It supports ATX 3.0 and uses a standard ATX form factor. It is fully modular with 80 Plus Gold efficiency. This unit is for builders who need more power capacity than 850W provides. It does not fit in SFX cases due to its larger size. You gain higher wattage and standard modularity but lose the compact size and higher efficiency rating. It is suitable for high-wattage ATX builds where space is available.
Corsair RM850x 850W Fully Modular ATX 3.1 PSU
The Corsair RM850x supports ATX 3.1 and PCIe 5.1 standards with a 12V-2x6 connector. It is fully modular and operates at 850W. It uses a standard ATX form factor, measuring 3.39 by 5.91 inches. This unit is for standard ATX builds needing modern connectivity. It lacks the compact SFX size of the SilverStone Extreme. You gain ATX 3.1 compliance and modular flexibility but lose the small footprint and Platinum efficiency. It is a practical choice for standard cases where size constraints do not apply.
Quick picks
Our 7 picks
SilverStone Extreme 850W Platinum SFX PSU
Best for: compact PC builds needing high power density
- Wattage
- 850W
- Efficiency Rating
- Cybenetics Platinum
- Modularity
- modular
- ATX Version
- ATX 3.0
- PCIe Connector Type
- 12VHPWR
- Fan Size
- 92mm
View on Amazon: SilverStone Extreme 850W Platinum SFX PSU Affiliate link
The SilverStone Extreme 850R Platinum is an 850W SFX power supply built for compact cases. It meets the SFX 12V V4.0 standard and supports ATX 3.0 with a PCIe 5.0 12VHPWR connector rated for 450W. You get Cybenetics Platinum efficiency and a 92mm FDB fan for quiet operation. It includes an ATX to SFX adapter bracket for easier installation in standard cases.
Pros
- Cybenetics Platinum efficiency certification
- Supports ATX 3.0 and PCIe 5.0 12VHPWR
- 92mm FDB fan with intelligent control
- Includes ATX to SFX adapter bracket
Cons
- 92mm fan is smaller than standard 120mm or 135mm units
- SFX form factor limits compatibility with standard ATX cases without adapter
- Cybenetics Platinum rating is not the official 80 PLUS Platinum standard
Good fit if
- You are building a compact PC with an SFX case
- You need high power density for modern GPUs
- You want quiet operation in a small chassis
Skip if
- You are using a standard ATX case without an adapter
- You require official 80 PLUS Platinum certification
- You prefer larger fans for passive cooling options
Verdict: SilverStone Extreme 850R Platinum SFX delivers high efficiency and modern connectivity in a compact frame. It is ideal for small form factor builds that demand reliable power for next-generation graphics cards.
be quiet! Dark Power 13 850W Titanium PSU
Best for: high-efficiency ATX builds with PCIe 5.0 GPUs
- Wattage
- 850W
- Efficiency Rating
- 80 PLUS Titanium
- ATX Version
- ATX 3.0
- PCIe Connector Type
- 12VHPWR, PCIe 6+2-pin
- Warranty
- 10-Year
- Dimensions
- 6.89 × 5.91 × 3.39 inches
View on Amazon: be quiet! Dark Power 13 850W Titanium PSU Affiliate link
The be quiet! Dark Power 13 850W delivers 80 PLUS Titanium efficiency, reaching up to 95.4% energy conversion. It supports ATX 3.0 standards with native 12VHPWR connectors for PCIe 5.0 graphics cards. The unit features four independent 12V rails and handles power excursions up to double its rated capacity. This makes it a robust option for high-end systems requiring stable power delivery and quiet operation.
Pros
- 80 PLUS Titanium efficiency rating for up to 95.4% energy conversion
- ATX 3.0 compliance with native 12VHPWR connector for PCIe 5.0 GPUs
- Handles power excursions up to double the rated 850W power
- Four independent 12V rails for stable power distribution
Cons
- Standard ATX form factor may not fit smaller SFX cases
- Dimensions of 6.89 x 5.91 x 3.39 inches are bulkier than SFX units
- Higher cost tier associated with Titanium certification
Good fit if
- You need maximum efficiency for a high-end desktop build
- You require native support for next-generation PCIe 5.0 graphics cards
- You want a power supply that handles high transient power loads
Skip if
- You are building in a small form factor case requiring SFX dimensions
- You prefer a lower-cost Gold efficiency rating over Titanium
- You need a compact unit with minimal depth for tight spaces
Verdict: be quiet! Dark Power 13 850W ATX 3.0 is a high-efficiency power supply for users prioritizing Titanium certification and PCIe 5.0 readiness. It fits standard ATX cases where size is not a constraint.
Montech Century G5 850W Power Supply
Best for: ATX builds needing PCIe 5.0 support
- Wattage
- 850W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.0
- Warranty
- 5-year
- Dimensions
- 5.51 × 5.9 × 3.38 inches
View on Amazon: Montech Century G5 850W Power Supply Affiliate link
The Montech Century G5 delivers 850W of power with 80 Plus Gold efficiency. It supports ATX 3.0 and PCIe 5.0 standards for modern graphics cards. The unit uses a full bridge LLC design with Japanese capacitors. It measures 5.9 by 3.38 by 5.51 inches. You get a fully modular cable setup. This unit suits builders needing stable power for high-end GPUs.
Pros
- 80 Plus Gold efficiency rating
- ATX 3.0 and PCIe 5.0 compliant
- Full bridge LLC resonant converter
- Fully modular cable design
- 5-year warranty coverage
Cons
- Lower 80 Plus Gold efficiency compared to Platinum or Titanium competitors
- Standard ATX form factor is bulkier than SFX alternatives
- Heavier build at 6.22 pounds
Good fit if
- You need ATX 3.0 support for new GPUs
- You prefer Gold efficiency for balanced cost and performance
- You want a fully modular unit with Japanese capacitors
Skip if
- You require SFX form factor for small cases
- You need Titanium efficiency for maximum energy savings
- You prioritize the lowest possible weight
Verdict: Montech Century G5 850W ATX 3.0 fits users who want reliable ATX 3.0 power without the premium cost of Platinum units.
Apevia Soul 850W ATX 3.1
Best for: Standard ATX cases needing PCIe 5.1 support
- Wattage
- 850W
- Modularity
- Fully Modular
- ATX Version
- ATX 3.0 & 3.1
- PCIe Connector Type
- 12V-2x6, 12VHPWR, 6+2Pin
- Fan Size
- 140mm
- PCIe Version
- PCIe 5.1
View on Amazon: Apevia Soul 850W ATX 3.1 Affiliate link
The Apevia Soul 850W is a fully modular power supply supporting ATX 3.1 and PCIe 5.1 standards. It features a 140mm fan with auto-thermal control and a 12V-2x6 connector for modern GPUs. Measuring 5.9 x 6.2 x 3.4 inches, it fits most standard ATX cases. This unit provides 850W of power with active PFC, making it a practical option for builders seeking current compatibility.
Pros
- Supports ATX 3.1 and PCIe 5.1 standards
- Includes 12V-2x6 connector for RTX graphics cards
- Fully modular design for clean cable management
- 140mm fan with auto-thermal speed control
Cons
- Heavier at 4.8 pounds compared to typical SFX units
- Larger dimensions than compact SFX form factors
- No mention of Cybenetics or 80 Plus Titanium certification
Good fit if
- You need ATX 3.1 compatibility for new GPUs
- You have a standard ATX case with room for size
- You want a fully modular unit for cable management
Skip if
- You require a compact SFX or SFX-L form factor
- You need a Titanium rated efficiency certification
- You prefer a lighter power supply under 4 pounds
Verdict: Apevia Soul 850W ATX 3.1 is a solid choice for standard ATX builds needing PCIe 5.1 support. It suits users prioritizing modern connector standards over compact size.
Corsair RM850x Shift 850W White ATX Power Supply
Best for: Standard ATX builds needing PCIe 5.1 support
- 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 Affiliate link
This is a fully modular ATX 3.1 power supply rated at 850W. It carries an 80 Plus Gold efficiency certification and supports PCIe 5.1 connectors. The unit measures 6.3 inches in length and weighs 3.75 pounds. You should choose this model if you need standard ATX dimensions and modern cable compatibility for high-end graphics cards.
Pros
- 80 Plus Gold efficiency rating
- Fully modular cable design
- ATX 3.1 standard support
- PCIe 5.1 connector compatibility
Cons
- 80 Plus Gold rating is lower than the Platinum and Titanium options on this list
- Standard ATX form factor is bulkier than the SFX units this guide compares
- Larger physical dimensions may not fit smaller cases
Good fit if
- You are building a standard ATX case and need 850W
- You require ATX 3.1 and PCIe 5.1 support
- You prefer fully modular cables for clean builds
Skip if
- You need a compact SFX form factor
- You require 80 Plus Platinum or Titanium efficiency
- You are building in a small form factor case
Verdict: Corsair RM850x Shift 850W ATX 3.1 is a solid mid-range option for standard ATX builds. It suits users who prioritize modern PCIe 5.1 support and modularity over compact size or peak efficiency.
Corsair RM1000x Shift 1000W Power Supply
Best for: high-wattage ATX 3.0 builds
- Wattage
- 1000W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.0
- Dimensions
- 7.09 × 5.91 × 5.08 inches
- Weight
- 4.2 pounds
View on Amazon: Corsair RM1000x Shift 1000W Power Supply Affiliate link
This 1000W power supply offers ATX 3.0 compliance and 80 Plus Gold efficiency. It features a fully modular design with a side interface. The unit measures 7.09 by 5.91 by 5.08 inches and weighs 4.2 pounds. You should consider this model if you need higher wattage than the 850W options on this list. It suits builds requiring robust power delivery and modern cable standards.
Pros
- 1000W output capacity
- 80 Plus Gold efficiency rating
- ATX 3.0 and PCIe 5.0 compliant
- Fully modular cable design
Cons
- 80 Plus Gold rating is lower than the Platinum and Titanium options
- Larger physical footprint than SFX form factors
- Heavier at 4.2 pounds
Good fit if
- You need more than 850W of power
- You want ATX 3.0 compatibility
- You prefer fully modular cables
Skip if
- You require Platinum or Titanium efficiency
- You are building a small form factor PC
- You need a lower wattage unit
Verdict: Corsair RM1000x Shift 1000W ATX 3.0 is a high-wattage option for users who need more power than the 850W alternatives. It fits builders prioritizing capacity and modern standards over maximum efficiency.
Corsair RM850x 850W Fully Modular ATX 3.1 PSU
Best for: standard ATX builds needing ATX 3.1
- 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 Affiliate link
This Corsair unit delivers 850W of power with ATX 3.1 compliance and PCIe 5.1 support. It features a fully modular design and Cybenetics Gold efficiency. The compact ATX form factor measures 3.39 by 5.91 inches. You get a 12V-2x6 connector for modern GPUs. This model suits builders needing reliable low-noise operation and current standard compatibility.
Pros
- ATX 3.1 compliance
- PCIe 5.1 support
- Fully modular cables
- Cybenetics Gold efficiency
- 12V-2x6 connector included
Cons
- Cybenetics Gold rating is lower than Platinum or Titanium tiers
- Standard ATX size may not fit small form factor cases
- No mention of silent fan mode in specifications
Good fit if
- You need ATX 3.1 compliance for new GPUs
- You want fully modular cables for clean builds
- You prefer Cybenetics Gold efficiency ratings
Skip if
- You require ATX 3.0 or 3.1 in a small form factor
- You need 80 Plus Titanium efficiency
- You want a specific silent fan curve not listed
Verdict: Corsair RM850x ATX 3.1 850W fits users who need ATX 3.1 compliance and PCIe 5.1 support in a standard ATX case. It offers a practical balance of modern connectivity and modular flexibility.
Specifications side by side
| Spec | SilverStone Extreme 850W Platinum SFX PSU | be quiet! Dark Power 13 850W Titanium PSU | Montech Century G5 850W Power Supply | Apevia Soul 850W ATX 3.1 | Corsair RM850x Shift 850W White ATX Power Supply | Corsair RM1000x Shift 1000W Power Supply | Corsair RM850x 850W Fully Modular ATX 3.1 PSU |
|---|---|---|---|---|---|---|---|
| Wattage | 850W | 850W | 850W | 850W | 850W | 1000W | 850W |
| Efficiency Rating | Cybenetics Platinum | 80 PLUS Titanium | 80 Plus Gold | not stated | 80 Plus Gold | 80 Plus Gold | Cybenetics Gold |
| Modularity | modular | not stated | Fully Modular | Fully Modular | Fully Modular | Fully Modular | Fully Modular |
| ATX Version | ATX 3.0 | ATX 3.0 | ATX 3.0 | ATX 3.0 & 3.1 | ATX 3.1 | ATX 3.0 | ATX 3.1 |
| PCIe Connector Type | 12VHPWR | 12VHPWR, PCIe 6+2-pin | not stated | 12V-2x6, 12VHPWR, 6+2Pin | PCIe 5.1 | not stated | 12V-2x6 |
| Fan Size | 92mm | not stated | not stated | 140mm | not stated | not stated | not stated |
| Warranty | not stated | 10-Year | 5-year | not stated | not stated | not stated | not stated |
| Form Factor | ATX | ATX | ATX | ATX | ATX | ATX | ATX |
| PCIe Version | not stated | not stated | not stated | PCIe 5.1 | PCIe 5.1 | not stated | PCIe 5.1 |
| Connector | not stated | not stated | not stated | 12V-2x6 Connector | not stated | not stated | 12V-2x6 Connector |
| Power Factor Correction | not stated | not stated | not stated | Active PFC | not stated | not stated | not stated |
| Size | 850W | 850W | 850W | 850W | 850W | 1000W | 850W |
| Dimensions | 4.92 × 3.94 × 2.5 inches | 6.89 × 5.91 × 3.39 inches | 5.51 × 5.9 × 3.38 inches | 6.2 × 5.9 × 3.4 inches | 6.3 × 5.91 × 3.39 inches | 7.09 × 5.91 × 5.08 inches | 2.3 × 3.39 × 5.91 inches |
| Weight | not stated | not stated | 6.22 pounds | 4.8 pounds | 3.75 pounds | 4.2 pounds | 3.9 pounds |
| Model | SST-EX850R-PM | BN660 | CENTURY G5 850W | ATX-SL850W | not stated | not stated | not stated |
| Color | not stated | not stated | not stated | Black | White | Black | Black |
If you are selecting a chassis, you can compare silverstone technology alta t1 aluminum alternatives to verify component clearances.
Frequently asked questions
Can I use these alternatives in a small form factor case?
Only the SilverStone Extreme 850W Platinum SFX fits compact builds. It measures 3.94 by 2.5 inches. All other listed units use standard ATX dimensions. For example, the be quiet! Dark Power 13 is 5.91 by 6.89 inches. You need a full-size ATX case for the Corsair and Montech options. Check your case clearance before buying a larger unit.
Which alternative offers the highest efficiency rating?
The be quiet! Dark Power 13 850W provides the highest efficiency. It carries an 80 Plus Titanium certification. This exceeds the Platinum rating of the SilverStone original. The Montech and Corsair units offer 80 Plus Gold certification. Titanium certification ensures lower power waste at typical loads compared to Gold or Platinum options.
Do these power supplies support PCIe 5.0 and 5.1 GPUs?
Yes, all listed units support modern GPU standards. The SilverStone, be quiet!, and Corsair RM850x Shift include ATX 3.0 or 3.1 compliance. This ensures native support for 12VHPWR connectors. The Apevia Soul and Corsair RM850x specifically mention PCIe 5.1 support. You can connect next-generation graphics cards without needing adapter cables.
Is full modularity available on these 850W alternatives?
Most listed options feature fully modular designs. The Montech Century G5, Apevia Soul, Corsair RM850x Shift, and Corsair RM850x are all fully modular. This lets you connect only the cables you need. The SilverStone Extreme and be quiet! Dark Power 13 also offer modular connectivity. This reduces clutter inside your case compared to non-modular units.
What is the best option if I need more than 850W?
The Corsair RM1000x Shift is the best choice for higher power. It delivers 1000W of output. This suits builds with high-end components that exceed 850W demands. It retains ATX 3.0 compliance and 80 Plus Gold efficiency. All other listed alternatives are capped at 850W. Choose this unit if your system requires additional headroom.
Which alternative is best for standard ATX cases?
The be quiet! Dark Power 13 and Montech Century G5 are ideal for standard ATX cases. They provide reliable power with standard dimensions. The Corsair RM850x Shift also fits well in these cases. These units prioritize modern connectivity and modularity over compact size. They are suitable if you do not need the small footprint of the SilverStone SFX unit.