ESGAMING or FSP? PC Power Supplies Compared in 2026
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When you compare ESGAMING vs FSP PC power supply options, you are looking at two very different builds. Both units provide essential 12V power for your system components. However, they serve distinct hardware needs. The ESGAMING unit offers higher wattage in a standard ATX form factor. The FSP unit focuses on high efficiency and compact size for Mini ITX cases. Your choice depends on whether you prioritize raw power output or energy savings in a small chassis.
Key differences
| Aspect | ESGAMING 600W Non-Modular ATX Power Supply | FSP 400W Gold Flex ATX Mini ITX Power Supply |
|---|---|---|
| Form Factor | ATX | Mini ITX |
| Efficiency Rating | not listed | 80 Plus Gold |
| Wattage | 600W | 400W |
| Modularity | Non-Modular | not listed |
| Fan Size | 120mm | 4 cm |
Which one should you choose?
Choose ESGAMING 600W Non-Modular ATX Power Supply if
- You need a standard ATX power supply for a larger case.
- You require higher wattage for demanding components.
- You want a non-modular design with pre-installed cables.
Choose FSP 400W Gold Flex ATX Mini ITX Power Supply if
- You are building in a compact Mini ITX case.
- You prioritize high energy efficiency with 80 Plus Gold certification.
- You need a low-profile unit for small form factor builds.
Verdict: Choose the ESGAMING unit if you need standard ATX dimensions and higher wattage for a typical desktop build. Select the FSP unit if you are constrained by a Mini ITX case or require the high efficiency of an 80 Plus Gold rating. Both units meet their specific design goals without compromise.
ESGAMING vs FSP PSU Comparison
Efficiency Rating
The FSP unit holds a distinct advantage here with its 80 Plus Gold certification. This rating confirms that the power supply converts more than 90% of AC input power into DC output for your components. High efficiency means less wasted energy as heat and lower electricity costs over time. The ESGAMING 600W model does not list an 80 Plus certification in its published specifications. Without this data, you cannot verify its energy conversion performance. For users prioritizing energy savings and reduced thermal output, the certified efficiency of the FSP unit is a measurable benefit over the uncertified ESGAMING option.
Form Factor
These two power supplies target completely different chassis types. The ESGAMING unit follows the standard ATX form factor, measuring 5.51 inches in length, 3.15 inches in width, and 5.91 inches in height. This size fits most standard desktop cases. The FSP unit is a Flex ATX or Mini ITX solution. It is significantly smaller, with a width of only 1.6 inches and a height of 3.25 inches. This compact design is intended for small form factor builds, such as Mini ITX cases or specialized industrial enclosures. You must check your case compatibility before choosing, as they are not interchangeable.
Wattage Output
If you need raw power capacity, the ESGAMING unit provides 600W of total output. This higher wattage supports systems with multiple components or higher power demands. The FSP unit offers 400W of output. While sufficient for low-power Mini ITX builds or basic office systems, it may not support high-end graphics cards or heavy multitasking loads. The 200W difference is significant for your hardware planning. You should match the wattage to your system's peak consumption to ensure stability and avoid potential shutdowns under load.
Modularity
The ESGAMING power supply is a non-modular unit. This means all cables are permanently attached to the power supply. You must use every cable or tuck them away, which can impact cable management and airflow inside your case. The FSP unit is also non-modular, as no modular connectors are listed in its specifications. Both units require you to manage all attached cables. Neither offers the clean installation benefits of fully modular or semi-modular designs. Your cable management efforts will be similar for both products.
Cooling System
Thermal management differs between the two units based on their size and fan specifications. The ESGAMING unit uses a large 120mm cooling fan. Larger fans can move more air at lower speeds, which may result in quieter operation under load. The FSP unit utilizes a small 4cm fan. Small fans often need to spin faster to achieve the same airflow, which can increase noise levels. The ESGAMING fan is also auto-thermally controlled, adjusting speed based on temperature. The FSP fan delivers airflow at a low noise level, but the size difference suggests different acoustic profiles for your system.
Which PSU fits your specific build needs
Standard ATX desktop builders
You need a standard ATX power supply for a typical desktop case. This ESGAMING unit delivers 600W of total power, which supports more components than the FSP option. It includes a 120mm fan for quiet operation and standard 24-pin main connectors. The non-modular design keeps costs lower while providing ample PCIe and SATA connections for your motherboard and storage drives.
Mini ITX and small form factor users
Your case has strict size constraints, likely for a Mini ITX or Flex ATX build. This FSP unit is significantly smaller, measuring just 1.6 inches in height. It offers 400W of power with 80 Plus Gold efficiency, ensuring less heat waste in a tight space. The compact 4cm fan and low profile make it the only viable choice for small chassis that cannot fit standard ATX dimensions.
Efficiency-focused system builders
You prioritize energy efficiency and thermal performance over raw wattage. The FSP unit carries an 80 Plus Gold certification, meaning it converts over 90% of input power effectively. This reduces electricity usage and heat generation. While the ESGAMING unit offers more power, it lacks this efficiency rating. For systems where power draw is moderate, the FSP Gold unit provides better performance per watt.
The products compared
ESGAMING 600W Non-Modular ATX Power Supply
Best for: Budget mid-range builds with standard ATX cases
- Wattage
- 600W
- Modularity
- Non-Modular
- PCIe Connector Type
- 6+2 pin
- Fan Size
- 120mm
- Form Factor
- ATX
- Dimensions
- 5.51 × 3.15 × 5.91 inches
View on Amazon: ESGAMING 600W Non-Modular ATX Power Supply Affiliate link
This ESGAMING unit delivers 600W of power through a standard ATX form factor. It uses a non-modular design with flat black cables and a 120mm cooling fan. The +12V rail provides 45A, supporting modern graphics cards. It includes essential safety protections against short circuits and overloads. This power supply suits users building mid-range systems who need reliable, straightforward connectivity without the complexity of modular wiring.
Pros
- 600W total output with 45A on the +12V rail
- 120mm auto-thermally controlled cooling fan for quiet operation
- Comprehensive safety protections including OVP, OCP, and OTP
- Splittable 8-pin connectors for flexible CPU and GPU wiring
Cons
- Non-modular design results in unused cable clutter
- 110-230V input switch requires manual adjustment
- Lacks 80 Plus efficiency certification listing
Good fit if
- You are building a budget-friendly mid-range PC
- You prefer a simple, non-modular cable setup
- You need standard ATX dimensions for your case
Skip if
- You require high-efficiency 80 Plus Gold or Platinum ratings
- You want fully modular cables for clean builds
- You need automatic voltage switching for travel
Verdict: ESGAMING 600W ATX Power Supply fits users who prioritize basic reliability and standard ATX compatibility over advanced efficiency ratings or modular cable management.
FSP 400W Gold Flex ATX Mini ITX Power Supply
Best for: Compact Mini ITX systems
- Wattage
- 400W
- Efficiency Rating
- 80 Plus Gold
- PCIe Connector Type
- 6+2 pin
- Fan Size
- 4 cm
- Form Factor
- Mini ITX
- Dimensions
- 5.9 × 1.6 × 3.25 inches
View on Amazon: FSP 400W Gold Flex ATX Mini ITX Power Supply Affiliate link
This FSP unit is a 400W Mini ITX power supply certified 80 Plus Gold. It measures 1.6 by 3.25 by 5.9 inches and weighs 2 pounds. The design uses a 4 cm fan for cooling. It includes one PCIe 6+2 pin connector for graphics cards. You should choose this if you need a compact, high-efficiency source for small form factor builds or industrial systems.
Pros
- 80 Plus Gold efficiency exceeds 90%
- Compact Mini ITX form factor
- Includes PCIe 6+2 pin connector
- Low ripple and noise levels
Cons
- Very small 4 cm fan size
- Only one PCIe connector available
- 400W wattage limits high-end GPUs
Good fit if
- You are building a Mini ITX PC
- You need high efficiency in a small case
- You are powering a low-power graphics card
Skip if
- You require multiple PCIe connectors
- You plan to use a high-end GPU
- You need a standard ATX size
Verdict: FSP 400W Mini ITX Gold PSU is a specialized unit for small builds. It fits users who prioritize efficiency and size over high power output.
Specifications side by side
| Spec | ESGAMING 600W Non-Modular ATX Power Supply | FSP 400W Gold Flex ATX Mini ITX Power Supply |
|---|---|---|
| Wattage | 600W | 400W |
| Efficiency Rating | not stated | 80 Plus Gold |
| Modularity | Non-Modular | not stated |
| PCIe Connector Type | 6+2 pin | 6+2 pin |
| Fan Size | 120mm | 4 cm |
| Form Factor | ATX | Mini ITX |
| Dimensions | 5.51 × 3.15 × 5.91 inches | 5.9 × 1.6 × 3.25 inches |
| Weight | not stated | 2 pounds |
| Size | 600W | 400W_Gold |
| Color | Black | not stated |
| Model | 600W Non-Modular | FSP400-60FGGBA |
Frequently asked questions
Is the ESGAMING 600W non-modular enough for a standard build?
Yes, this unit is designed for budget mid-range systems using standard ATX cases. It provides 600W of power in a non-modular configuration, meaning all cables are permanently attached. This setup works well if you prioritize basic reliability and standard compatibility over advanced cable management features.
Can the FSP 400W Gold fit in a Mini ITX case?
Yes, this power supply is specifically built for compact Mini ITX systems. It measures 1.6 inches in width and 3.25 inches in height, making it suitable for small form factor builds. You get 80 Plus Gold efficiency, which helps reduce heat and power waste in tight spaces.
What is the difference between the ESGAMING and FSP form factors?
The ESGAMING unit uses a standard ATX form factor, which fits most typical desktop cases. The FSP unit uses a Mini ITX form factor, designed for smaller, specialized builds. Your choice depends on whether you are building a standard desktop or a compact system with limited internal space.
Does the FSP PSU have an efficiency rating?
Yes, the FSP unit holds an 80 Plus Gold certification. This rating confirms that the power supply converts more than 90% of AC input power into DC output for your components. High efficiency reduces energy waste and heat generation, which is beneficial for sustained performance in your system.
Which power supply offers more wattage for my components?
The ESGAMING 600W model offers higher total power output than the FSP 400W option. If your build includes multiple high-draw components, the ESGAMING unit provides more headroom. The FSP unit is specialized for efficiency and size, offering lower wattage to suit compact builds with fewer power demands.
Is the ESGAMING power supply modular?
No, the ESGAMING 600W is a non-modular power supply. All cables are fixed to the unit, which simplifies installation but offers less flexibility in cable routing. This design is practical for users who prioritize basic reliability and standard ATX compatibility over the neatness of modular cable management.
How small is the FSP Mini ITX power supply?
The FSP unit is compact, measuring 1.6 inches in width, 3.25 inches in height, and 5.9 inches in length. It also weighs just 2 pounds. These dimensions make it ideal for Mini ITX cases where space is limited and you need a specialized unit that fits tight enclosures.