6 Best Alternatives to the ESGAMING 300W TFX Power Supply (2026)
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The ESGAMING TFX 300W Standard Flex ATX power supply offers a compact solution for low-power NAS and small server builds. It supports standard TFX dimensions and includes essential protections like OVP and OCP. However, you might look for esgaming tfx 300w standard flex alternatives if you need higher wattage, better efficiency, or modular flexibility. Some users require more power for demanding components, while others prioritize gold efficiency ratings to reduce heat and energy waste.
This list includes seven alternatives that share the Flex ATX form factor with the original unit. We selected these products because their specifications overlap with the ESGAMING model in key areas like size and compatibility. The options range from budget-friendly 500W units to fully modular 600W models. Each entry is ranked by its specific strengths, such as efficiency, modularity, or price-to-performance ratio. You can choose based on whether you need a basic fixed-cable unit or a high-end modular system. All listed products fit within similar compact chassis constraints, ensuring they work in the same small form factor environments as the ESGAMING power supply.
Our top pick: ESGAMING 300W TFX Power Supply.
How these Flex ATX options compare
SilverStone 500W Flex ATX Power Supply
The SilverStone FX500-G offers 500W of power, which is significantly more than the ESGAMING 300W unit. It uses a Flex ATX form factor with dimensions of 3.21 by 1.59 by 5.91 inches. This model earns 80 Plus Gold efficiency, ensuring less wasted energy as heat compared to standard units. It weighs 2.87 pounds, making it slightly heavier but sturdier. You should choose this if you need reliable continuous power for compact builds that demand higher wattage without sacrificing efficiency. It provides a robust upgrade path for small form factor systems requiring more than 300W.
Ptcliss 600W Fully Modular Flex ATX PSU
The Ptcliss 600W Flex ATX PSU delivers 600W of output, doubling the capacity of the ESGAMING 300W. It features fully modular cables, allowing you to connect only what you need, which improves airflow in tight spaces. Like the SilverStone option, it holds an 80 Plus Gold efficiency rating. Its dimensions are 3.2 by 1.58 by 6.5 inches, fitting standard Flex ATX chassis. Weighing just 1.55 pounds, it is lighter than many competitors. Pick this if your compact system requires high power and you want the flexibility of modular connections for cleaner cable management in small builds.
FSP FlexGURU 500W Flex ATX PSU
The FSP FlexGURU Pro 500W provides 500W of power with 80 Plus Gold efficiency, surpassing the ESGAMING 300W in both wattage and performance. It measures 1.59 by 3.21 by 5.91 inches, maintaining the compact Flex ATX footprint. At 2.18 pounds, it offers a solid build quality for small form factor or 1U systems. This unit is ideal for users who prioritize stable power delivery and high efficiency in tight spaces. If you need more power than 300W but want to keep your system compact and efficient, this premium option delivers reliable performance for demanding compact builds.
ESGAMING 300W Flex ATX Power Supply
This ESGAMING 300W Flex ATX model shares the same 300W output as the original TFX version. It measures 3.35 by 2.56 by 6.69 inches, identical to the TFX dimensions. It is designed for low-power mini ITX or NAS builds where space is limited. Unlike the TFX, this version focuses on basic compact power without advanced modularity. It is a suitable choice if you need a simple, reliable power source for systems that do not require high wattage. It offers a straightforward solution for users who prefer the ESGAMING brand but need a standard Flex ATX form factor for their chassis.
SilverStone FX600z 600W Fully Modular Flex ATX
The SilverStone FX600z provides 600W of power, significantly exceeding the ESGAMING 300W capacity. It is fully modular, allowing for customized cable routing in tight spaces. Its dimensions are 3.4 by 1.6 by 6.5 inches, fitting standard Flex ATX cases. This unit is built for high-power small form factor builds that demand modern connector support. It offers robust power delivery for demanding systems. Choose this if you need maximum wattage in a compact chassis and want the flexibility of modular cables. It is a strong alternative for users who outgrow the 300W limit but still require a small footprint.
SilverStone 350W Gold Flex ATX PSU
The SilverStone FX350-G-VT offers 350W of power, which is slightly higher than the ESGAMING 300W. It features 80 Plus Gold efficiency, providing better energy conservation than standard units. Its dimensions are 3.3 by 1.6 by 6 inches, making it compact for Flex ATX systems. Weighing 3 pounds, it has a sturdy build. This unit is ideal for users who prioritize efficiency and reliability in tight spaces. It uses fixed cables, which may be less flexible than modular options but ensures a clean setup. Pick this if you need a bit more power than 300W with high efficiency in a small form factor.
Quick picks
Our 7 picks
ESGAMING 300W TFX Power Supply
Best for: low-power NAS and small server builds
- Wattage
- 300W
- Fan Size
- 80mm
- Form Factor
- Flex ATX
- Dimensions
- 6.69 × 3.35 × 2.56 inches
View on Amazon: ESGAMING 300W TFX Power Supply Affiliate link
This ESGAMING unit is a 300W Flex ATX power supply designed for compact builds. It measures 170 by 85 by 65 mm and uses an 80mm fan for airflow. The unit includes standard protections like OVP and OCP. It supports a 115/220V input switch. This PSU is suitable for NAS systems or small enterprise servers where space is tight.
Pros
- 300W output capacity for low-power systems
- Includes OVP, UVP, OCP, OPP, SCP, and OTP protections
- Splitable 24-pin and 8-pin connectors for flexibility
- Compact 170x85x65mm form factor fits tight spaces
Cons
- Lower 300W wattage limits compatibility with high-power components
- 80mm fan may produce more noise than larger fans
- Lacks 80 Plus efficiency certification listed in specs
Good fit if
- You need a compact power supply for a NAS build
- You are building a small form factor enterprise server
- Your system components require less than 300W of power
Skip if
- You require high efficiency ratings like 80 Plus Gold
- Your system needs more than 300W of power
- You prefer silent operation with larger cooling fans
Verdict: ESGAMING TFX 300W Flex ATX is a compact option for low-power builds. It fits well in NAS or small servers where space is limited and power needs are modest.
SilverStone 500W Flex ATX Power Supply
Best for: Compact builds needing reliable 500W power
- Wattage
- 500W
- Efficiency Rating
- 80 PLUS Gold
- Form Factor
- Flex ATX
- Dimensions
- 5.91 × 3.21 × 1.59 inches
- Weight
- 2.87 pounds
View on Amazon: SilverStone 500W Flex ATX Power Supply Affiliate link
The Silverstone FX500-G is a 500W Flex ATX power supply designed for compact builds. It carries an 80 PLUS Gold efficiency rating and uses Japanese primary capacitors for reliability. The unit delivers continuous power at 40°C and features a single +12V rail. It measures 3.21 by 1.59 by 5.91 inches. This model suits users needing stable power in small form factor cases without the bulk of larger units.
Pros
- 500W continuous output rated for 24/7 operation at 40°C
- 80 PLUS Gold efficiency certification
- Japanese primary capacitors for durability
- Class-leading single +12V rail design
Cons
- Non-modular cable management limits cable routing flexibility
- Heavier at 2.87 pounds compared to some lighter alternatives
- Single +12V rail may not suit users needing multiple independent voltage lines
Good fit if
- You need a compact Flex ATX unit for a small form factor PC
- You prioritize high efficiency and continuous operation at elevated temperatures
- You want a reliable single +12V rail for modern components
Skip if
- You require modular cables for cleaner cable management in tight spaces
- You need multiple independent +12V rails for specific multi-GPU setups
- You are building a system where weight is a critical constraint
Verdict: Silverstone FX500-G 500W Flex ATX fits users who need reliable, efficient power in a compact chassis. It is ideal for small form factor builds that demand continuous operation and high efficiency.
Ptcliss 600W Fully Modular Flex ATX PSU
Best for: high-power compact builds
- Wattage
- 600W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Fully Modular
- PCIe Connector Type
- 8-pin, 6-pin
- Form Factor
- Flex ATX
- Dimensions
- 6.5 × 3.2 × 1.58 inches
View on Amazon: Ptcliss 600W Fully Modular Flex ATX PSU Affiliate link
The Ptcliss 600W is a fully modular Flex ATX power supply with 80 Plus Gold efficiency. It measures 6.5 by 3.2 by 1.58 inches and weighs 1.55 pounds. The unit uses a DC-DC structure and Japanese capacitors for stable output. It includes OVP, UVP, OCP, OPP, SCP, and OTP protections. This model suits you if you need high wattage in a small form factor.
Pros
- 600W output capacity
- Fully modular cable design
- 80 Plus Gold efficiency rating
- DC-DC structure for stable output
- Comprehensive multi-protection features
Cons
- Heavier than the ESGAMING 300W
- Larger dimensions than standard TFX units
- No mention of active PFC in key specs
Good fit if
- You need more than 300W in a Flex ATX chassis
- You want fully modular cables for cleaner builds
- You require high efficiency for energy savings
Skip if
- You are limited to a strict 300W power budget
- You need a standard TFX form factor
- You prefer a lighter power supply unit
Verdict: Ptcliss 600W Flex ATX PSU is a high-wattage option for users needing more power than the ESGAMING 300W. It fits well in compact systems that support the Flex ATX standard.
FSP FlexGURU 500W Flex ATX PSU
Best for: Gold efficiency in compact 1U and SFF builds
- Wattage
- 500W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Non-Modular
- Fan Size
- 40mm
- Warranty
- 5-Year
- Form Factor
- Flex ATX
View on Amazon: FSP FlexGURU 500W Flex ATX PSU Affiliate link
The FSP FlexGURU Pro 500W is a Flex ATX power supply designed for small form factor builds. It carries an 80 Plus Gold efficiency rating, ensuring up to 90% efficiency under typical loads. The unit includes a 40mm fan with intelligent speed control for thermal management. It features Japanese electrolytic capacitors for stable voltage regulation. This PSU suits users needing reliable power for 1U IPCs, NAS arrays, or edge computing setups in tight spaces.
Pros
- 80 Plus Gold efficiency rating for reduced heat and energy consumption
- 40mm 2-ball bearing fan with intelligent speed control
- Japanese electrolytic capacitors for precise voltage regulation
- Includes universal mounting bracket for easy installation
- All-black round cabling for better airflow and routing
Cons
- 40mm fan size is smaller than standard 120mm units
- Fixed non-modular cabling limits cable management flexibility
- Higher weight at 2.18 pounds compared to lighter competitors
Good fit if
- You need 80 Plus Gold efficiency in a Flex ATX form factor
- You are building a 1U IPC or NAS array
- You require Japanese capacitors for long-term reliability
Skip if
- You require a fully modular power supply
- You need a larger 120mm fan for quieter operation
- You are building a standard ATX desktop PC
Verdict: FSP FlexGURU Pro 500W Flex ATX delivers high efficiency and reliable components for small form factor systems. It is the right choice for users prioritizing Gold efficiency and stable power in compact 1U or SFF builds.
ESGAMING 300W Flex ATX Power Supply
Best for: Low-power mini ITX and NAS builds
- Wattage
- 300W
- Fan Size
- 80mm
- Form Factor
- Flex ATX
- Dimensions
- 6.69 × 3.35 × 2.56 inches
View on Amazon: ESGAMING 300W Flex ATX Power Supply Affiliate link
This ESGAMING unit provides 300W of power in a compact Flex ATX form factor. It measures 170 by 85 by 65 mm and uses an 80 mm fan for ventilation. You can switch between 115V and 220V input manually. It includes OVP, UVP, OCP, OPP, SCP, and OTP protections. It suits NAS builds and mini ITX systems where space is tight.
Pros
- 300W output capacity
- Compact 170x85x65 mm Flex ATX size
- Multiple safety protections including OVP and UVP
- Manual 115/220V input switch
- 80 mm forced air fan
Cons
- Lower 300W wattage compared to 500W and 600W alternatives
- Non-modular cable design
- Manual voltage switch requires opening the case
Good fit if
- You need a standard Flex ATX unit for a small form factor build
- You are building a NAS or mini ITX system with low power needs
- You require basic safety protections in a compact size
Skip if
- You need more than 300W of power
- You want a fully modular cable setup
- You prefer automatic voltage sensing without manual switches
Verdict: ESGAMING TFX 300W Flex ATX PSU fits users who need a basic, compact power source for low-power mini ITX or NAS builds. It does not suit systems requiring higher wattage or modular flexibility.
SilverStone FX600z 600W Fully Modular Flex ATX
Best for: High-power small form factor builds
- Wattage
- 600W
- Efficiency Rating
- Cybenetics Platinum
- Modularity
- Fully Modular
- PCIe Connector Type
- 12V-2x6, PCIe 8-pin, 6-pin
- Form Factor
- Flex ATX
- Dimensions
- 6.5 × 3.4 × 1.6 inches
View on Amazon: SilverStone FX600z 600W Fully Modular Flex ATX Affiliate link
The Silverstone FX600z is a 600W Flex ATX power supply with Cybenetics Platinum efficiency. It features a fully modular design and includes a built-in 300W 12V-2x6 connector. This unit delivers continuous power at 50°C and uses Japanese primary capacitors. It suits users needing high wattage in a small form factor without sacrificing efficiency or cable management.
Pros
- 600W continuous power output
- Cybenetics Platinum efficiency rating
- Fully modular cable design
- Includes 12V-2x6 connector
Cons
- Larger physical dimensions than standard 300W units
- No 80 Plus Gold badge listed
- Heavier build due to higher capacity
Good fit if
- You need 600W in a Flex ATX chassis
- You require 12V-2x6 support for new GPUs
- You prioritize high efficiency ratings
Skip if
- You are limited to a 300W power budget
- You need the smallest possible Flex ATX footprint
- You prefer 80 Plus Gold certification
Verdict: Silverstone FX600z 600W Flex ATX provides robust power for demanding small builds. It fits users who need modern connector support and top-tier efficiency in a compact form factor.
SilverStone 350W Gold Flex ATX PSU
Best for: compact builds needing gold efficiency
- Wattage
- 350W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Fixed Cables
- PCIe Connector Type
- PCIe 6pin
- Form Factor
- Flex ATX
- Dimensions
- 6 × 3.3 × 1.6 inches
View on Amazon: SilverStone 350W Gold Flex ATX PSU Affiliate link
The SilverStone FX350-G-VT delivers 350W of continuous power in a compact Flex ATX form factor. It holds an 80 Plus Gold efficiency rating and features a single +12V rail. The unit includes fixed cables and supports a PCIe 6-pin connector. It is rated for 24/7 operation at 40°C. This power supply suits users needing reliable, high-efficiency power for small form factor builds.
Pros
- 80 Plus Gold efficiency certification
- 350W continuous output at 40°C
- Single +12V rail design
- Fixed cables included
Cons
- Fixed cables limit cable management flexibility
- Lower wattage than 500W or 600W alternatives
- Only supports PCIe 6-pin connectors
Good fit if
- You need high efficiency in a small chassis
- You require stable power for 24/7 operation
- You are building a compact Flex ATX system
Skip if
- You need modular cables for clean builds
- You require higher than 350W power
- You need PCIe 8-pin connectors
Verdict: SilverStone FX350-G-VT 350W Flex ATX is a solid choice for users prioritizing efficiency and reliability in tight spaces. It fits well in compact builds where fixed cables and gold efficiency matter most.
Specifications side by side
| Spec | ESGAMING 300W TFX Power Supply | SilverStone 500W Flex ATX Power Supply | Ptcliss 600W Fully Modular Flex ATX PSU | FSP FlexGURU 500W Flex ATX PSU | ESGAMING 300W Flex ATX Power Supply | SilverStone FX600z 600W Fully Modular Flex ATX | SilverStone 350W Gold Flex ATX PSU |
|---|---|---|---|---|---|---|---|
| Wattage | 300W | 500W | 600W | 500W | 300W | 600W | 350W |
| Efficiency Rating | not specified | 80 PLUS Gold | 80 Plus Gold | 80 Plus Gold | not specified | Cybenetics Platinum | 80 Plus Gold |
| Modularity | not specified | not specified | Fully Modular | Non-Modular | not specified | Fully Modular | Fixed Cables |
| PCIe Connector Type | not specified | not specified | 8-pin, 6-pin | not specified | not specified | 12V-2x6, PCIe 8-pin, 6-pin | PCIe 6pin |
| Fan Size | 80mm | not specified | not specified | 40mm | 80mm | not specified | not specified |
| Warranty | not specified | not specified | not specified | 5-Year | not specified | not specified | not specified |
| Form Factor | Flex ATX | Flex ATX | Flex ATX | Flex ATX | Flex ATX | Flex ATX | Flex ATX |
| Size | not specified | 500W | not specified | 500W | not specified | not specified | not specified |
| Device Compatibility | not specified | not specified | not specified | NAS | not specified | not specified | not specified |
| Dimensions | 6.69 × 3.35 × 2.56 inches | 5.91 × 3.21 × 1.59 inches | 6.5 × 3.2 × 1.58 inches | 5.91 × 1.59 × 3.21 inches | 6.69 × 3.35 × 2.56 inches | 6.5 × 3.4 × 1.6 inches | 6 × 3.3 × 1.6 inches |
| Weight | not specified | 2.87 pounds | 1.55 pounds | 2.18 pounds | not specified | not specified | 3 pounds |
| Color | Black | not specified | not specified | Black | not specified | not specified | not specified |
| Model | TFX300W | not specified | FLEX-600W | FLEX GURU 500-T | TFX-300W | SST-FX0600MCPT-A | SST-FX350-G-VT |
For a related comparison, read jbl tune flex alternatives.
Frequently asked questions
Can I use a standard ATX power supply in a Flex ATX chassis?
No, you cannot. Standard ATX units are much larger and will not fit in chassis designed for the compact Flex ATX form factor. You must use a power supply that matches the specific physical dimensions and mounting points of the Flex ATX standard to ensure proper installation and airflow in small form factor builds.
Is the SilverStone FX500-G a good alternative to the ESGAMING 300W?
Yes, it is a strong option for users needing more power. It provides 500W of continuous output, which is significantly higher than the 300W ESGAMING unit. It maintains the same compact Flex ATX dimensions of 3.21 by 1.59 by 5.91 inches, allowing it to fit in the same small cases while offering 80 Plus Gold efficiency.
Which Flex ATX power supply offers full modularity?
The Ptcliss 600W and SilverStone FX600z both feature fully modular designs. This allows you to connect only the cables you need, reducing clutter in tight spaces. The Ptcliss model delivers 600W of power, while the SilverStone FX600z also provides 600W with modern connector support, making them suitable for high-power compact builds.
Does the FSP FlexGURU 500W fit in small 1U cases?
Yes, the FSP FlexGURU 500W is designed for compact 1U and small form factor systems. It uses the Flex ATX form factor with dimensions of 1.59 by 3.21 by 5.91 inches. This unit provides 80 Plus Gold efficiency, ensuring reliable power delivery and reduced heat output in constrained environments where space is limited.
What is the difference between the two ESGAMING 300W models listed?
Both models share identical physical specifications, measuring 3.35 by 2.56 by 6.69 inches. They both provide 300W of power in the Flex ATX form factor. The primary distinction lies in their intended use cases as described in their verdicts. One is highlighted for low-power NAS builds, while the other is noted for basic mini ITX applications.
Which power supply is best for efficiency in a compact build?
Several options offer 80 Plus Gold efficiency, including the SilverStone FX500-G, Ptcliss 600W, FSP FlexGURU 500W, and SilverStone FX350-G-VT. These units convert more power into usable energy with less waste heat. The SilverStone FX350-G-VT provides 350W with fixed cables, while the others offer higher wattages or modularity depending on your specific power requirements.
How heavy are these Flex ATX power supplies?
Weights vary by model and construction. The SilverStone FX500-G weighs 2.87 pounds, while the FSP FlexGURU 500W is lighter at 2.18 pounds. The Ptcliss 600W is notably light at 1.55 pounds. The SilverStone FX350-G-VT weighs 3 pounds. These weights are typical for compact units and do not significantly impact the overall weight of small form factor cases.