6 Best Alternatives to the SilverStone 300W Bronze TFX Power (2026)

How each alternative compares

SilverStone 450W SFX Bronze Power Supply

This SilverStone unit shifts from TFX to SFX form factor, increasing dimensions to 7 by 4 by 9 inches. It provides 450W of continuous power, offering 150W more than the 300W reference model. The 80 PLUS Bronze certification remains consistent, ensuring similar efficiency standards. You gain significant wattage headroom for modest upgrades, but the larger footprint may not fit tight TFX chassis. This option suits builders needing more power than 300W can provide while staying within the small form factor category. It is a practical step up for users who find the original model underpowered for their specific component list.

EVGA 500 BA 500W Bronze Power Supply

The EVGA 500W model moves to standard ATX dimensions, measuring 5.9 by 3.38 by 5.51 inches. It delivers 500W of output, which is substantially higher than the 300W baseline. While it retains 80 PLUS Bronze efficiency, the physical size change means it will not fit in cases designed for TFX or SFX units. This alternative is best for users who can switch to a standard ATX case and require more power for mid-range components. You trade the compact footprint of the SilverStone TFX for greater wattage and standard compatibility. It is a solid choice if your chassis constraints allow for larger power supplies.

SilverStone 450W Bronze SFX Power Supply

This SilverStone SFX unit offers 450W of power, matching the second entry but with different dimensions of 4.92 by 2.5 by 3.94 inches. It features an 80 PLUS Bronze rating and supports 36A on the +12V rail. The form factor change from TFX to SFX affects case compatibility, as SFX units have different mounting holes and connector layouts. This model provides more power density for compact builds that do not require the specific TFX 10-pin connector. It is suitable for users who need reliable performance in a small case but do not strictly require the TFX form factor. It bridges the gap between low-wattage TFX and higher-wattage SFX options.

LXun 310W Lenovo TFX Power Supply

The LXun 310W unit is designed as a direct replacement for Lenovo ThinkCentre systems using TFX form factors. It measures 3.2 by 2.6 by 5.9 inches, closely matching the original SilverStone dimensions. With 310W of output, it offers slightly more power than the 300W baseline. This alternative prioritizes compatibility with specific OEM connectors, such as the 10-pin TFX connector, over universal modularity or high wattage. It is ideal for users replacing a failed unit in a Lenovo desktop who need a drop-in fit. You sacrifice premium features for direct compatibility. This model is a practical solution for maintaining original system functionality without upgrading the chassis.

GAMDIAS 850W ATX 3.1 Power Supply

The GAMDIAS 850W unit jumps to ATX form factor with dimensions of 8.3 by 3.9 by 10.2 inches. It delivers 850W of power, far exceeding the 300W reference. It supports ATX 3.1 and PCIe 5.1 standards, providing modern connectivity for high-end GPUs. While it maintains 80 PLUS Bronze efficiency, the significant increase in size and power makes it unsuitable for small form factor cases. This option is for users building standard ATX gaming rigs who need substantial power headroom. You give up compactness for high wattage and future-proofed connectors. It is a robust choice for performance-focused builds that do not require TFX or SFX constraints.

Enermax Cyber Source III 850W ATX 3.1 PSU

The Enermax 850W model is a non-modular ATX power supply measuring 5.91 by 3.39 by 5.51 inches. It provides 850W of continuous output with 80 PLUS Bronze efficiency. It supports ATX 3.1 and PCIe 5.1 standards, ensuring compatibility with modern graphics cards. Unlike the fixed-cable TFX unit, this is a full-size ATX supply with non-modular cabling. It is designed for users who prioritize wattage and connector availability over cable management flexibility. The standard ATX form factor limits its use to larger cases. This alternative is best for builders who need high power delivery and do not require the compact footprint of the SilverStone TFX model.

Quick picks

Our 7 picks

1 Best overall

SilverStone 300W Bronze TFX Power Supply

Best for: Compact TFX builds with modest power needs

Wattage

300W

Efficiency Rating

80 PLUS Bronze

Modularity

Fixed Cable

PCIe Connector Type

PCI-E 6pin

Fan Size

80mm

Form Factor

TFX

View on Amazon: SilverStone 300W Bronze TFX Power Supply Affiliate link

The SilverStone Technology TX300-VT is a 300W TFX power supply designed for compact builds. It features 80 PLUS Bronze efficiency and fixed cables. The unit includes an 80mm fan for silent operation at 18 dBA. It supports standard TFX form factors and single 6-pin PCIe connectors. This PSU suits users needing reliable power for small form factor PCs without requiring modular flexibility.

Pros

• 80 PLUS Bronze efficiency rating
• 300W continuous output at 40°C
• Silent 80mm fan with 18 dBA noise level
• Fixed cable design for compact builds

Cons

• Limited to single 6-pin PCIe connector
• Non-modular fixed cables reduce cable management options
• Lower 300W wattage compared to other options on this list

Good fit if

• You need a TFX form factor for a small case
• You require 80 PLUS Bronze efficiency for standard power needs
• You are building a compact PC with low power requirements

Skip if

• You need more than 300W of power for high-end components
• You require modular cables for cleaner cable management
• You need multiple PCIe power connectors for graphics cards

Verdict: SilverStone 300W TFX Bronze PSU is a solid choice for small form factor builds that do not demand high wattage or modular flexibility. It fits users prioritizing efficiency and silence in a compact chassis.

2 Also great

SilverStone 450W SFX Bronze Power Supply

Best for: Small form factor builds needing 450W

Wattage

450W

Efficiency Rating

80 Plus Bronze

Form Factor

SFX

Dimensions

9 × 7 × 4 inches

View on Amazon: SilverStone 450W SFX Bronze Power Supply Affiliate link

This SilverStone unit delivers 450W of continuous power in a compact SFX form factor. It carries an 80 Plus Bronze efficiency rating, ensuring reliable performance at 40°C. The design includes a standard ATX mounting bracket for flexibility. You get a strong single +12V rail capable of 36A. It suits users needing more wattage than smaller TFX units but with a small footprint.

Pros

• 450W continuous output
• 80 Plus Bronze efficiency
• Single +12V rail with 36A
• Includes ATX bracket

Cons

• SFX form factor limits case compatibility
• No modular cable management
• Fixed output wattage

Good fit if

• You need 450W in a small case
• You want 80 Plus Bronze efficiency
• You require a single +12V rail

Skip if

• You need more than 450W
• You prefer ATX size
• You want modular cables

Verdict: SilverStone 450W SFX Bronze PSU offers solid power density for small builds. It fits users who need reliable 450W output without the bulk of larger units.

3 Also great

EVGA 500 BA 500W Bronze Power Supply

Best for: Standard ATX desktop builds

Wattage

500W

Efficiency Rating

80 PLUS Bronze

Warranty

3 Year

Dimensions

5.51 × 5.9 × 3.38 inches

View on Amazon: EVGA 500 BA 500W Bronze Power Supply Affiliate link

The EVGA 500 BA offers 500W of power with 80 PLUS Bronze efficiency. It features a single 12V rail and DC-DC converters for stable voltage. The unit includes active PFC and comprehensive protections like OVP and OCP. Its auto-fan design ensures quiet operation under typical loads. This PSU suits users needing reliable mid-range power for standard builds.

Pros

• 80 PLUS Bronze certification for 85% efficiency
• 500W output capacity
• Single 12V rail with DC-DC converters
• Active Power Factor Correction (PFC)
• Comprehensive protection circuits including OVP and SCP

Cons

• Non-modular cable design limits cable management
• Standard ATX form factor may not fit small cases
• 3-year warranty is shorter than premium competitors

Good fit if

• You need a reliable 500W power source for standard ATX builds
• You prioritize 80 PLUS Bronze efficiency ratings
• You want built-in protections for hardware safety

Skip if

• You require modular cables for clean builds
• You need more than 500W of power
• You are building in a compact SFX case

Verdict: EVGA 500W Bronze ATX PSU provides solid efficiency and protections for standard desktops. It fits users who value stable power delivery over cable management flexibility.

4 Best premium

SilverStone 450W Bronze SFX Power Supply

Best for: compact builds needing 450W SFX power

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

View on Amazon: SilverStone 450W Bronze SFX Power Supply Affiliate link

This SilverStone unit delivers 450W in an SFX form factor, offering a compact solution for smaller builds. It features 80 PLUS Bronze efficiency, ensuring reliable power conversion under load. The single +12V rail provides up to 36A, supporting modern graphics cards via one 8-pin and two 6-pin PCIe connectors. It includes an ATX bracket for broader compatibility. You should consider this if you need a reliable upgrade from the 300W TX300-VT while staying within the SFX footprint.

Pros

• 450W output capacity
• 80 PLUS Bronze efficiency rating
• Single +12V rail with 36A support
• Includes ATX mounting bracket

Cons

• Fixed cable design limits cable management options
• Lower wattage than premium 850W alternatives
• Only one 8-pin PCIe connector available

Good fit if

• You need more power than 300W but must fit in an SFX case
• You want 80 PLUS Bronze efficiency for better energy use
• You are upgrading from the Silverstone TX300-VT

Skip if

• You require a modular cable setup for cleaner builds
• You need more than 450W for high-end GPUs
• You prefer ATX form factor without brackets

Verdict: SilverStone 450W SFX Bronze PSU is a solid mid-range option for users needing more power than the 300W TX300-VT. It fits well in compact cases where SFX is required, offering reliable 36A on the +12V rail for standard gaming components.

5 Also great

LXun 310W Lenovo TFX Power Supply

Best for: Lenovo ThinkCentre TFX replacements

Wattage

310W

PCIe Connector Type

6+2pin

Warranty

1 Year

Form Factor

TFX

Dimensions

5.9 × 3.2 × 2.6 inches

Weight

1.79 pounds

View on Amazon: LXun 310W Lenovo TFX Power Supply Affiliate link

This LXun unit is a 310W TFX power supply designed for Lenovo ThinkCentre systems. It features a 10-pin motherboard connector and dual 6+2-pin PCIe cables. The +12V rails deliver 18A each, with a combined output capped at 310W. It includes a temperature-controlled fan that activates only when needed. The build measures 5.9 by 3.2 by 2.6 inches and weighs 1.79 pounds.

Pros

• 310W total output capacity
• 10-pin motherboard connector
• Dual 6+2-pin PCIe connectors
• Temperature-controlled fan operation
• Compatible with Lenovo TFX models

Cons

• Short 1-year warranty period
• Lower wattage than standard ATX units
• Non-modular fixed cable design

Good fit if

• You need a replacement for a Lenovo ThinkCentre TFX system
• You require a 10-pin connector for your motherboard
• You want a compact power supply for a small form factor build

Skip if

• You need more than 310W of power
• You require a longer warranty than one year
• You are building a standard ATX desktop

Verdict: LXun 310W TFX Power Supply is a direct replacement for specific Lenovo desktops needing a 10-pin TFX unit. It fits users who prioritize compatibility over high wattage or extended warranty coverage.

6 Best budget

GAMDIAS 850W ATX 3.1 Power Supply

Best for: high-wattage ATX gaming builds

Wattage

850W

Efficiency Rating

80+ Bronze

ATX Version

ATX 3.1

PCIe Connector Type

12V-2x6

PCIe Version

PCIe 5.1

Recommended Use

Gaming

View on Amazon: GAMDIAS 850W ATX 3.1 Power Supply Affiliate link

The GAMDIAS HELIOS M2-850B is an 850W ATX 3.1 power supply designed for gaming systems. It features 80 Plus Bronze efficiency and a PCIe 12V-2x6 connector for next-generation GPUs. The unit uses a single +12V rail and DC to DC design for stable voltage regulation. Its automatic fan speed optimization balances load and noise. This model suits builders needing high wattage and modern connectivity standards.

Pros

• 850W output capacity
• ATX 3.1 ready with 200% power excursion support
• PCIe 12V-2x6 connector for PCIe 5.1 GPUs
• 80 Plus Bronze efficiency certification
• Automatic fan speed optimization for noise balance

Cons

• Non-modular fixed cables
• 80 Plus Bronze rating is lower than Gold or Platinum options
• Larger ATX form factor than SFX or TFX units

Good fit if

• You need an 850W power supply for high-end gaming builds
• You require ATX 3.1 and PCIe 5.1 compatibility
• You prefer a single +12V rail for stable power delivery

Skip if

• You need a compact SFX or TFX form factor
• You require 80 Plus Gold or higher efficiency
• You want a fully modular cable setup

Verdict: The GAMDIAS HELIOS M2-850B 850W ATX 3.1 fits users who need high wattage and modern GPU connectivity in a standard ATX case. It offers reliable power for gaming but lacks the efficiency and modularity of premium alternatives.

7 Best non-modular

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

View on Amazon: Enermax Cyber Source III 850W ATX 3.1 PSU Affiliate link

This Enermax unit delivers 850W of power in a standard ATX form factor. It features ATX 3.1 and PCIe 5.1 support, including a 12V-2x6 cable for modern GPUs. The 80 Plus Bronze rating ensures efficient operation. You get a non-modular design with sleeved cables for tidy builds. The 120mm fan keeps noise low under load. It suits users needing high wattage without modular flexibility.

Pros

• 850W output for high-end systems
• ATX 3.1 and PCIe 5.1 compatibility
• Includes 12V-2x6 GPU cable
• 80 Plus Bronze efficiency
• 120mm fluid dynamic bearing fan

Cons

• Non-modular design limits cable management
• Larger ATX size may not fit small cases
• No 12VHPDC native connector listed

Good fit if

• You need 850W for a high-end GPU
• You prefer standard ATX case sizes
• You want PCIe 5.1 ready cabling

Skip if

• You require modular cable management
• You are building in a small form factor case
• You need 80 Plus Gold efficiency

Verdict: Enermax Cyber Source III 850W Non-Modular provides robust power for modern graphics cards. It fits users who prioritize wattage and new connector standards over cable flexibility.

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