6 Best Alternatives to the SilverStone Technology 450W SFX Form (2026)
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The SilverStone Technology 450W SFX Form Factor power supply delivers continuous output with an 80 Plus Bronze efficiency rating. If you are searching for silverstone technology 450w sfx form alternatives, you likely need a different wattage, efficiency level, or form factor. The original unit offers a compact 7x4x9 inch footprint and a strong single +12V rail. However, you might prefer a higher wattage for more demanding hardware or a Gold-rated unit for better energy savings. Some builds require standard ATX dimensions, while others need fully modular cabling for cleaner installs.
This list covers 6 options that share key specifications with the original SilverStone unit. We selected these alternatives because their specs overlap with the 450W Bronze baseline, ensuring they fit similar use cases. You will find compact SFX models with higher wattages, such as 650W and 850W Gold options. We also include standard ATX units for users who can accommodate a larger footprint. Each product is evaluated strictly by its published data, including efficiency ratings, physical dimensions, and connectivity standards. This approach helps you compare technical details directly without marketing noise.
Our top pick: SilverStone 450W SFX Bronze Power Supply.
How each alternative compares
SilverStone 450W Bronze SFX Power Supply
This SilverStone model shares the 80 Plus Bronze rating and SFX form factor with the original. It distinguishes itself by offering dedicated PCI-E cabling, which simplifies connections for graphics cards in tight spaces. The included mounting bracket allows installation in standard ATX cases, providing the same flexibility as the base model. If you prefer pre-routed cables over modular options, this unit offers a straightforward setup. It maintains the 450W output but organizes the internal wiring for easier management within compact chassis designs.
EVGA 500 BA 500W Bronze Power Supply
The EVGA unit increases wattage to 500W while keeping the 80 Plus Bronze efficiency level. It switches to a standard ATX form factor, meaning it requires a larger case than the original SFX unit. This makes it unsuitable for small form factor builds but ideal for standard desktop towers. You gain 50W of additional power and full electrical protections. If your case supports ATX dimensions, this provides more headroom for components without sacrificing efficiency standards found in the SilverStone original.
GAMEMAX GS Series 650W SFX PSU
This GAMEMAX unit steps up to 650W and achieves 80 Plus Gold efficiency, significantly improving power conversion. It retains the compact SFX form factor, fitting in the same small cases as the original. The fully modular cabling allows you to connect only the cables you need, reducing clutter inside the chassis. This adds 200W of capacity and better efficiency compared to the Bronze-rated SilverStone. Choose this if you need higher power density and cleaner cable management in a small build.
GAMEMAX 850W SFX Gold Power Supply
The GAMEMAX 850W model offers substantially more power than the original 450W unit. It maintains the SFX form factor for small cases while delivering 80 Plus Gold efficiency. Full modularity helps manage the increased cable load, and ATX 3.0 support ensures compatibility with modern high-end graphics cards. This is a major upgrade in capacity and efficiency. Select this alternative if your hardware demands more than 450W but you still require a compact power supply for your specific chassis constraints.
GAMDIAS 850W ATX 3.1 Power Supply
This GAMDIAS unit moves to the standard ATX form factor, requiring a larger case than the original SFX unit. It provides 850W of power with 80 Plus Bronze efficiency. The ATX 3.1 standard and PCIe 5.1 connectivity support the latest high-performance gaming hardware. While it matches the original efficiency rating, it offers nearly double the wattage. This option suits users who prioritize raw power and modern connectivity over compact size, assuming their case can accommodate standard ATX dimensions.
Enermax Cyber Source III 850W ATX 3.1 PSU
The Enermax unit also uses the standard ATX form factor, sacrificing compactness for higher capacity. It delivers 850W with 80 Plus Bronze efficiency, matching the original rating but vastly exceeding its power output. The non-modular design means all cables are permanently attached, which can create more clutter. It features ATX 3.1 and PCIe 5.1 support for modern GPUs. Pick this if you need maximum power in a standard case and do not require the cable management flexibility of modular units.
Quick picks
Our 7 picks
SilverStone 450W SFX Bronze Power Supply
Best for: compact low-to-mid-range PC builds
- Wattage
- 450W
- Efficiency Rating
- 80 Plus Bronze
- Form Factor
- SFX
- Dimensions
- 9 × 7 × 4 inches
The SilverStone 450W Bronze SFX Power Supply is a compact small-form-factor unit delivering 450 watts of continuous power rated at 40°C. It features 80 Plus Bronze efficiency and provides 36A across a single +12V rail. An included bracket allows mounting in standard ATX chassis. You get a reliable core unit if you are assembling a compact desktop build or need a replacement power source for low-to-mid-range hardware.
Pros
- 450W continuous power rated for 24/7 operation at 40°C
- Single +12V rail delivering up to 36A
- Includes bracket for mounting in standard ATX cases
- 80 Plus Bronze efficiency reaching 82% to 85%
Cons
- 80 Plus Bronze efficiency sits below higher Gold alternatives
- 450W maximum output restricts high-draw hardware upgrades
Good fit if
- You need an SFX power supply with an included ATX mounting bracket.
- You run a small-form-factor PC needing up to 450W continuous output.
Skip if
- You require more than 450W for high-draw hardware configurations.
- You prioritize higher efficiency tiers such as 80 Plus Gold.
Verdict: SilverStone 450W Bronze SFX Power Supply delivers continuous 450W output and a 36A rail for compact desktop configurations. It offers flexible installation across SFX and ATX enclosures via its included adapter bracket.
SilverStone 450W Bronze SFX Power Supply
Best for: compact builds needing ATX adapter flexibility
- Wattage
- 450W
- Efficiency Rating
- 80 PLUS Bronze
- PCIe Connector Type
- PCI-E 8pin, PCI-E 6pin
- Form Factor
- SFX
- Dimensions
- 3.94 × 4.92 × 2.5 inches
This SilverStone unit delivers 450W of continuous power in a compact SFX chassis measuring 4.92 inches wide, 2.5 inches high, and 3.94 inches deep. It features 80 PLUS Bronze certification, active PFC, and a single +12V rail rated at 36A. An included adapter bracket allows installation in standard ATX cases. You get dedicated PCI-E 8-pin and 6-pin connections, making it a viable fit for compact desktop builds with moderate graphics hardware.
Pros
- Single +12V rail delivering up to 36A
- Includes bracket for installation in standard ATX mounts
- 80 PLUS Bronze efficiency rating of 82% to 85%
- Compact SFX dimensions of 4.92 x 2.5 x 3.94 inches
Cons
- Total output limited to 450W capacity
- PCI-E connectivity restricted to one 8-pin and dual 6-pin connectors
Good fit if
- You need a compact SFX power supply with an included ATX mounting bracket.
- You run a mid-range graphics card requiring 8-pin or 6-pin PCI-E power.
- You want an 80 PLUS Bronze unit delivering 36A on a single +12V rail.
Skip if
- You require more than 450W of total system output.
- You need multiple 8-pin PCI-E connectors for demanding graphics cards.
Verdict: SilverStone 450W Bronze SFX Power Supply provides 80 PLUS Bronze efficiency and dedicated PCI-E cabling inside compact spaces. The included mounting bracket ensures versatile installation across both SFX and standard ATX chassis.
EVGA 500 BA 500W Bronze Power Supply
Best for: budget builds accommodating standard ATX power supplies
- Wattage
- 500W
- Efficiency Rating
- 80 PLUS Bronze
- Warranty
- 3 Year
- Dimensions
- 5.51 × 5.9 × 3.38 inches
The EVGA 500 BA is a 500W power supply offering 80 PLUS Bronze efficiency with DC-to-DC conversion and active PFC. Its dimensions measure 5.9 inches wide, 3.38 inches high, and 5.51 inches long, making it an ATX-sized alternative if your PC case accepts standard power supplies. It suits you if you need slightly more output than a 450W unit alongside full protections including OVP, UVP, OCP, OPP, SCP, and OTP.
Pros
- 80 PLUS Bronze certified with up to 85% typical efficiency
- DC-to-DC converter with a single +12V rail
- Full suite of protections including OVP, UVP, OCP, OPP, SCP, and OTP
- Intelligent auto fan designed for quiet operation
Cons
- Standard ATX dimensions do not fit SFX-only cases
- Limited to a 3-year warranty
Good fit if
- You need a 500W power supply for a case that accommodates standard ATX dimensions.
- You want comprehensive hardware safeguards, including over-temperature and over-current protection.
Skip if
- You need a true SFX-sized unit for an ultra-compact enclosure.
- You require higher energy efficiency than 80 PLUS Bronze.
Verdict: EVGA 500 BA 500W Bronze Power Supply delivers reliable 500W output with complete electrical protections for standard-sized cases. It serves as a dependable choice if your build can house an ATX footprint instead of compact SFX hardware.
GAMEMAX GS Series 650W SFX PSU
Best for: compact builds needing 650W Gold efficiency
- Wattage
- 650W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Full Modular
- Form Factor
- SFX
This unit is an SFX form factor power supply built for compact PC builds. It delivers 650W of continuous power with an 80 Plus Gold efficiency certification. The fully modular design lets you attach only the cables required for your build, helping you conserve interior room and streamline air paths. It fits small-form-factor systems needing more headroom than a baseline 450W supply.
Pros
- SFX compact form factor
- 650W continuous output
- 80 Plus Gold efficiency certification
- Fully modular cable design
Cons
- No ATX mounting bracket listed in specifications
- Connector counts and cable lengths not specified
Good fit if
- You need a compact SFX power supply with 650W of output.
- You want fully modular cables to minimize clutter in a tight chassis.
- You target 80 Plus Gold certified electrical efficiency.
Skip if
- You need higher capacity than 650W for power-heavy components.
- You require explicit cable lengths and connector counts before buying.
Verdict: GAMEMAX GS Series 650W SFX PSU combines compact SFX sizing, fully modular cabling, and 80 Plus Gold efficiency for small-form-factor systems. It delivers a 200W output step above entry-level 450W alternatives.
GAMEMAX 850W SFX Gold Power Supply
Best for: compact high-power builds needing 12VHPWR connectivity
- Wattage
- 850W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Full Modular
- ATX Version
- ATX 3.0
- PCIe Connector Type
- 12VHPWR
- Form Factor
- SFX
The GAMEMAX 850W SFX Gold Power Supply provides 850 watts in a compact SFX form factor. It features fully modular cabling, 80 Plus Gold efficiency, and ATX 3.0 compatibility with a dedicated 12VHPWR connector. You also get Japanese 105°C main capacitors and an FDB cooling fan. It suits you if you need high power delivery and modern connector standards for a small form factor build.
Pros
- 850W capacity in a compact SFX form factor
- 80 Plus Gold efficiency rating
- ATX 3.0 ready with 600W 12VHPWR connector
- Fully modular cable configuration
- Japanese 105°C main capacitors
Cons
- Higher wattage capacity than necessary for entry-level setups
- Adheres to ATX 3.0 rather than newer ATX 3.1 revision
Good fit if
- You need 850W of power inside a compact SFX case.
- You require a native 16-pin 12VHPWR connector for a PCIe 5.0 graphics card.
- You want fully modular cables to reduce clutter in small enclosures.
Skip if
- You only require a 450W unit for low-power hardware.
- You specifically require an ATX 3.1 specification power supply.
Verdict: GAMEMAX 850W SFX Gold Power Supply delivers high output, modular cabling, and ATX 3.0 support for compact builds. It is a solid upgrade when a standard 450W unit cannot power your hardware.
GAMDIAS 850W ATX 3.1 Power Supply
Best for: high-draw gaming builds in ATX cases
- Wattage
- 850W
- Efficiency Rating
- 80+ Bronze
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
- PCIe Version
- PCIe 5.1
- Recommended Use
- Gaming
The GAMDIAS 850W ATX 3.1 Power Supply is a standard ATX unit built for high-draw gaming components. While original SFX units target small cases, this alternative requires a standard ATX chassis. It provides 850 watts of output, 80 Plus Bronze efficiency, and native PCIe 5.1 support via a 12V-2x6 connector. It suits you if your build has outgrown 450W limits and your PC case accommodates standard ATX dimensions.
Pros
- 850W output with ATX 3.1 compliance
- Native PCIe 5.1 12V-2x6 connector
- Single +12V rail with DC-to-DC design
- Automatic fan speed optimization system
Cons
- Standard ATX form factor will not fit compact SFX enclosures
- 80 Plus Bronze rating offers lower efficiency than Gold alternatives
Good fit if
- You need 850W of power for high-draw gaming graphics cards.
- You use an ATX case and require a native PCIe 5.1 12V-2x6 connector.
- You want ATX 3.1 excursion support up to 200%.
Skip if
- You need a compact SFX power supply for a small-form-factor case.
- You require an 80 Plus Gold or higher efficiency rating.
Verdict: GAMDIAS 850W ATX 3.1 Power Supply delivers high wattage and modern PCIe 5.1 connectivity for gaming hardware, provided your chassis accommodates standard ATX power units.
Enermax Cyber Source III 850W ATX 3.1 PSU
Best for: High-wattage ATX builds with modern GPUs
- Wattage
- 850 Watt
- Efficiency Rating
- 80 Plus Bronze
- Modularity
- Non-Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
- Fan Size
- 120mm
The Enermax Cyber Source III is an 850W ATX 3.1 power supply designed for modern high-performance systems. It features 80 Plus Bronze efficiency and a 12V-2x6 PCIe 5.1 connector for recent GPUs. The unit uses a 120mm fluid dynamic bearing fan for quiet operation. Its non-modular design includes fully sleeved cables for tidy builds. This PSU suits users needing high wattage and stable power delivery without the complexity of modular cabling.
Pros
- 850W capacity with 80 Plus Bronze efficiency
- ATX 3.1 standard with 12V-2x6 PCIe 5.1 connector
- 120mm fluid dynamic bearing fan for low noise
- 200% power excursion reserve for load stability
- Fully sleeved mesh cables for clean installation
Cons
- Non-modular design requires managing all cables
- ATX 3.1 form factor is larger than SFX
- 80 Plus Bronze rating is less efficient than Gold
Good fit if
- You need high wattage for modern graphics cards
- You prefer non-modular simplicity and fixed cabling
- You have an ATX case with room for larger PSUs
Skip if
- You require an SFX form factor for small cases
- You want full modularity for custom cable lengths
- You need 80 Plus Gold efficiency for lower heat
Verdict: Enermax Cyber Source III 850W Non-Modular delivers robust power for ATX builds with modern GPU support. It fits users who prioritize capacity and stability over compact size or modular flexibility.
Specifications side by side
| Spec | SilverStone 450W SFX Bronze Power Supply | SilverStone 450W Bronze SFX Power Supply | EVGA 500 BA 500W Bronze Power Supply | GAMEMAX GS Series 650W SFX PSU | GAMEMAX 850W SFX Gold Power Supply | GAMDIAS 850W ATX 3.1 Power Supply | Enermax Cyber Source III 850W ATX 3.1 PSU |
|---|---|---|---|---|---|---|---|
| Wattage | 450W | 450W | 500W | 650W | 850W | 850W | 850 Watt |
| Efficiency Rating | 80 Plus Bronze | 80 PLUS Bronze | 80 PLUS Bronze | 80 Plus Gold | 80 Plus Gold | 80+ Bronze | 80 Plus Bronze |
| Modularity | not specified | not specified | not specified | Full Modular | Full Modular | not specified | Non-Modular |
| ATX Version | not specified | not specified | not specified | not specified | ATX 3.0 | ATX 3.1 | ATX 3.1 |
| PCIe Connector Type | not specified | PCI-E 8pin, PCI-E 6pin | not specified | not specified | 12VHPWR | 12V-2x6 | 12V-2x6 |
| Fan Size | not specified | not specified | not specified | not specified | not specified | not specified | 120mm |
| Warranty | not specified | not specified | 3 Year | not specified | not specified | not specified | not specified |
| Form Factor | SFX | SFX | not specified | SFX | SFX | ATX | ATX |
| PCIe Version | not specified | not specified | not specified | not specified | not specified | PCIe 5.1 | PCIe 5.1 |
| Recommended Use | not specified | not specified | not specified | not specified | not specified | Gaming | not specified |
| Power Factor Correction | not specified | not specified | not specified | not specified | not specified | Active PFC | not specified |
| Size | 450W | 450W V3 | 500W | not specified | 850W | not specified | 850W |
| Dimensions | 9 × 7 × 4 inches | 3.94 × 4.92 × 2.5 inches | 5.51 × 5.9 × 3.38 inches | not specified | not specified | 10.2 × 8.3 × 3.9 inches | 5.51 × 5.91 × 3.39 inches |
| Weight | not specified | not specified | not specified | not specified | not specified | not specified | 3.57 pounds |
| Model | SST-ST45SF-V3-USA | SST-ST45SF V3 | 100-BA-0500-K1 | not specified | not specified | HELIOS M2-850B(US) | EMB850EWT-NAC |
| Color | not specified | not specified | not specified | not specified | WHITE | not specified | Black |
For small cases needing matched cooling hardware, review silverstone technology low profile 95w alternatives alongside your power supply options.
Frequently asked questions
Can I use a standard ATX power supply instead of SFX?
Yes, if your case supports standard ATX dimensions. The EVGA 500 BA offers 500W output in a standard footprint. It provides reliable performance for builds that do not require compact SFX hardware. This option is ideal when space constraints are not a priority. You gain more flexibility in case selection and cooling airflow compared to smaller form factors.
Which SFX power supply offers the highest wattage?
The GAMEMAX 850W SFX Gold Power Supply provides the highest output at 850W. It supports ATX 3.0 standards and includes fully modular cabling. This unit is designed for compact builds needing significant power for high-end components. It delivers a substantial power step above entry-level 450W alternatives while maintaining the small SFX form factor.
Is there a fully modular SFX power supply available?
Yes, the GAMEMAX GS Series 650W SFX PSU is fully modular. It combines compact sizing with 80 Plus Gold efficiency. This modularity allows you to connect only the cables you need, reducing clutter in small cases. It is suitable for compact builds that require higher efficiency and cleaner cable management than standard non-modular units.
What modern PCIe connector standards are available in SFX units?
The GAMEMAX 850W SFX Gold Power Supply supports ATX 3.0 standards. This includes native connectivity for modern graphics cards. It ensures compatibility with the latest high-power GPU requirements. By supporting these newer standards, the unit provides reliable power delivery for current-generation hardware without needing external adapters or complex wiring setups.
Which option is best for high-draw gaming in a standard case?
The GAMDIAS 850W ATX 3.1 Power Supply is ideal for gaming. It delivers high wattage with PCIe 5.1 connectivity. This unit is designed for standard ATX cases rather than compact SFX builds. It supports active PFC and meets the demands of high-draw gaming hardware, providing stable power for intensive graphical workloads and modern system configurations.
Can I install an SFX power supply in an ATX case?
Yes, the SilverStone 450W SFX Bronze Power Supply includes an adapter bracket. This bracket allows flexible installation across both SFX and standard ATX enclosures. It simplifies mounting in larger cases where SFX units fit with minor adjustments. This feature provides versatility if you plan to upgrade your chassis or need compatibility with multiple case types.