6 Best Alternatives to the FSP 220W Mini ITX PSU (2026)

How alternatives differ from FSP

T.F.SKYWINDINTL 600W Fully Modular Flex ATX PSU

The T.F.SKYWINDINTL unit jumps to 600W continuous output, which is nearly triple the 220W of the FSP. It uses a fully modular design, letting you connect only the cables you need. This reduces clutter in tight Mini ITX cases. Its dimensions are slightly larger at 3.27 by 1.57 by 6.5 inches, but it still fits standard small form factor slots. You get active PFC for stable power delivery. This option suits builders who need more headroom for discrete GPUs or high-end CPUs. It sacrifices the ultra-compact footprint of the original for significantly higher power density and cleaner cable management.

Rosewill 500W Fully Modular Mini ITX PSU

The Rosewill VIT500 provides 500W of power, more than double the FSP baseline. It features full modularity and a five-year warranty, which is longer than typical entry-level units. The form factor is listed as Mini ITX or Flex ATX, measuring 3.15 by 1.57 by 6.5 inches. It includes active PFC for efficient power conversion. This PSU targets users who need robust performance for NAS or light workstations without the bulk of full ATX units. It drops the 80 PLUS certification of the original but compensates with higher wattage and a longer warranty period. It is a practical choice for expanding power needs in small enclosures.

Thermaltake Smart 700W 80 Plus White PSU

The Thermaltake Smart 700W is a standard ATX unit, not a Mini ITX form factor. It offers 700W continuous output with 80 PLUS White efficiency and active PFC. Its dimensions are 5.8 by 3.5 by 5.9 inches, making it too large for small cases. This PSU is designed for standard desktop towers where space is not a constraint. It provides a five-year warranty for reliability. You should choose this if you are building a standard desktop rather than a compact system. It lacks the compact size and specific Mini ITX compatibility of the FSP, but delivers significantly more power for mainstream desktop components.

Seasonic 300W Flex ATX Gold Power Supply

The Seasonic unit delivers 300W with 80 PLUS Gold efficiency, which is higher than the FSP’s 80 PLUS certification level. It uses active PFC for better power factor correction. The model is designed for Flex ATX form factors, fitting into small form factor builds. It prioritizes power savings and efficiency over raw wattage. This makes it ideal for users who want quiet operation and lower energy consumption in compact systems. It lacks the specific Mini ITX badge but offers superior efficiency ratings. You should pick this if power efficiency is your top priority and you need more than 220W but less than 400W for your small build.

Apevia SFX 400W Power Supply

The Apevia SFX 400W offers 400W of power, which is nearly double the FSP output. It uses the SFX form factor, measuring 4 by 2.5 by 5 inches. This size is slightly different from the original Mini ITX dimensions but fits many small cases. It provides solid connectivity for basic setups. However, it lacks the 80 PLUS efficiency rating found in the FSP unit. It is a reliable option for users who need more power than 220W but do not require certified efficiency ratings. The compact SFX design makes it suitable for tight builds where standard ATX units will not fit.

RGEEK Mini ITX DC to DC ATX Power Supply

The RGEEK unit is a DC to DC power supply, meaning it requires a 12V DC input rather than standard AC wall power. It provides 300W of power in a very compact package weighing just 6.38 ounces. It is designed for users who already have a 12V DC power source. This PSU lacks standard AC input and efficiency ratings like 80 PLUS. It is best for specialized small builds or embedded systems where DC power is available. You should choose this if you are building a unique compact system with existing DC infrastructure. It differs significantly from the FSP by relying on DC input rather than standard AC mains power.

Quick picks

Our 7 picks

1 Best overall

FSP 220W Mini ITX PSU

Best for: Low-power Mini ITX builds

Wattage

220W

Efficiency Rating

80 Plus Certified

Fan Size

40mm

Form Factor

Mini ITX

Power Factor Correction

Active PFC

Dimensions

5.9 × 1.6 × 3.2 inches

View on Amazon: FSP 220W Mini ITX PSU Affiliate link

This FSP unit delivers 220 watts of continuous power in a Flex ATX form factor. It features 80 PLUS certification and active PFC for stable input handling. The 40mm fan uses thermal control to manage noise. At 1.8 pounds, it is lightweight for small builds. It suits low-power Mini ITX systems requiring basic efficiency.

Pros

• 220-watt continuous output
• 80 PLUS certification
• Active PFC support
• 40mm thermal-controlled fan

Cons

• Low 220W power limit compared to 300W+ alternatives
• Single voltage rail design
• Basic 80 PLUS rating without Gold efficiency

Good fit if

• You need a compact Flex ATX PSU for low-power builds
• You require active PFC for unstable input voltages
• You prioritize 80 PLUS certification for energy savings

Skip if

• You need more than 220 watts for high-end components
• You require fully modular cabling for cleaner installs
• You want Gold efficiency for maximum power savings

Verdict: FSP 220W Mini ITX PSU offers essential efficiency and compact size for light-duty Mini ITX systems. It fits users needing basic active PFC and 80 PLUS certification without excess power.

2 Also great

T.F.SKYWINDINTL 600W Fully Modular Flex ATX PSU

Best for: High-power small form factor builds

Wattage

600W

Modularity

Fully Modular

PCIe Connector Type

6+2pin

Form Factor

Rackmount

Power Factor Correction

Active PFC

Device Compatibility

PCs

View on Amazon: T.F.SKYWINDINTL 600W Fully Modular Flex ATX PSU Affiliate link

This Flex ATX unit delivers 600W of power in a compact 1U form factor. It is fully modular, allowing you to route only the cables you need. The design includes active PFC and multi-layer safety protections like OVP and OCP. At 2.2 pounds, it fits small ITX cases and home servers. You get a complete cable kit with standard connectors for easy installation.

Pros

• 600W continuous power output
• Fully modular cable design
• Active PFC for efficiency
• Multi-layer safety protections
• Compact 1U dimensions

Cons

• Higher wattage than typical 220W Mini ITX alternatives
• Brand is less established than major PSU manufacturers
• No 80 Plus certification listed in specifications

Good fit if

• You need more power than standard Mini ITX PSUs provide
• You want to eliminate cable clutter in a small case
• You are building a high-performance SFF workstation

Skip if

• You require a certified 80 Plus efficiency rating
• You are building a low-power office PC
• You prefer well-known brands with extensive warranty support

Verdict: T.F.SKYWINDINTL 600W Fully Modular Flex ATX is a high-power option for builders who outgrow standard Mini ITX limits. It suits users needing robust power for small form factor workstations or gaming rigs.

3 Best 5 year warranty

Rosewill 500W Fully Modular Mini ITX PSU

Best for: High-power Mini ITX builds

Wattage

500W

Modularity

Fully Modular

PCIe Connector Type

6+2 pin

Fan Size

40mm

Warranty

5-year

Form Factor

Mini ITX

View on Amazon: Rosewill 500W Fully Modular Mini ITX PSU Affiliate link

This Rosewill unit is a 500W fully modular power supply designed for Mini ITX and Flex ATX cases. It features active PFC for stable input across 90-264V. The 40mm fan uses intelligent thermal control to manage noise. It includes standard protections like OVP and OCP. This PSU suits builders needing high wattage in a small form factor.

Pros

• 500W continuous power output
• Fully modular cable design
• Active PFC for wide voltage input
• 5-year manufacturer warranty
• 40mm fan with thermal control

Cons

• 40mm fan size may limit airflow in tight cases
• Only two SATA connectors provided
• Lacks 80 Plus efficiency certification listing

Good fit if

• You need 500W in a Mini ITX chassis
• You prefer fully modular cables for clean builds
• You want a 5-year warranty for long-term use

Skip if

• You require 80 Plus Gold or higher certification
• You need more than two SATA power connectors
• You prefer larger fans for quieter operation

Verdict: Rosewill VIT 500W Mini ITX PSU offers high wattage and full modularity for small builds. It fits users prioritizing power density and warranty length over certified efficiency ratings.

4 Also great

Thermaltake Smart 700W 80 Plus White PSU

Best for: Standard ATX desktops needing 700W

Wattage

700W

Efficiency Rating

80+ White

ATX Version

ATX 12V V2.3

Fan Size

120mm

Warranty

5 Year

Power Factor Correction

Active PFC

View on Amazon: Thermaltake Smart 700W 80 Plus White PSU Affiliate link

This Thermaltake unit delivers 700W of continuous power with 80 PLUS White efficiency. It uses a 120mm fan for airflow and supports ATX 12V V2.3 standards. The active PFC ensures stable voltage. It fits standard ATX cases. This model suits builders needing reliable high-wattage performance for mainstream desktops.

Pros

• 700W continuous power output
• 80 PLUS White certified efficiency
• 120mm ultra quiet fan
• Active PFC support
• 5-year warranty

Cons

• Only 80 PLUS White efficiency rating
• Standard ATX form factor limits small builds
• No modular cable management

Good fit if

• You need 700W for a standard ATX build
• You prioritize continuous power stability
• You want a 5-year warranty

Skip if

• You require 80 PLUS Gold efficiency
• You are building a Mini ITX system
• You need fully modular cables

Verdict: Thermaltake Smart 700W 80+ White PSU offers solid 700W power for standard ATX cases. It fits users who need reliable performance and a 5-year warranty for mainstream desktops.

5 Best premium

Seasonic 300W Flex ATX Gold Power Supply

Best for: High-efficiency small form factor builds

Wattage

300W

Efficiency Rating

80 PLUS Gold

ATX Version

ATX 12 V v 2 31

Power Factor Correction

Active PFC

View on Amazon: Seasonic 300W Flex ATX Gold Power Supply Affiliate link

The Seasonic SSP-300SUG is a 300W Flex ATX power supply designed for small form factor builds. It carries an 80 PLUS Gold efficiency rating, achieving up to 90% efficiency at 50% load on 115V input. The unit features active PFC and meets ATX 12V v2.31 standards. It suits users who need reliable industrial-grade power in a compact Flex ATX chassis without sacrificing energy efficiency.

Pros

• 300W continuous power output
• 80 PLUS Gold efficiency rating
• Active PFC circuit design
• ATX 12V v2.31 compliant

Cons

• Lower wattage than many competitors
• Non-modular cable management
• Limited to Flex ATX form factor

Good fit if

• You need high efficiency in a small case
• You require ATX 12V v2.31 compliance
• You want industrial-grade reliability

Skip if

• You need more than 300W of power
• You require a modular cable setup
• You need a standard ATX size

Verdict: Seasonic 300W Flex ATX Gold PSU delivers top-tier efficiency for compact builds, making it ideal for users prioritizing power savings in small form factors over raw wattage.

6 Also great

Apevia SFX 400W Power Supply

Best for: Compact builds needing 400W

Wattage

400W

PCIe Connector Type

6/8pin PCIe

Fan Size

80mm

Form Factor

Mini ITX

Dimensions

5 × 4 × 2.5 inches

Weight

2.03 pounds

View on Amazon: Apevia SFX 400W Power Supply Affiliate link

The Apevia SFX-AP400W delivers 400W of continuous power in a compact 125mm x 100mm x 63.5mm chassis. It features an 80mm thermal-sensing fan and fully sleeved cables. This unit provides essential connectors, including a 20+4pin main, PCIe, and peripheral options. It suits builders needing a reliable, space-efficient power source for small form factor systems without excessive bulk.

Pros

• 400W output capacity
• 80mm thermal-sensing fan
• Fully sleeved cables
• SFX form factor dimensions

Cons

• Only one PCIe connector available
• 80mm fan may be louder than larger units
• No 80 Plus efficiency certification listed

Good fit if

• You need a compact SFX power supply
• You require 400W for small builds
• You prefer sleeved cables for aesthetics

Skip if

• You need multiple PCIe connectors
• You require 80 Plus Gold efficiency
• You want a larger 120mm fan

Verdict: Apevia 400W Mini ITX SFX PSU fits users who need a compact, reliable power source for small builds. It offers solid connectivity for basic setups but lacks high-efficiency ratings.

7 Best budget

RGEEK Mini ITX DC to DC ATX Power Supply

Best for: Compact Mini ITX builds using DC input

Wattage

300W

Form Factor

Mini ITX

Device Compatibility

PCs

Weight

6.38 ounces

View on Amazon: RGEEK Mini ITX DC to DC ATX Power Supply Affiliate link

This RGEEK unit is a 300W Mini ITX power supply designed for 12V DC input. It accepts voltage between 11.2 and 12.6V via a standard 2.5mm inner and 5.5mm outer barrel connector. The unit weighs 6.38 ounces. It includes short-circuit protection and defensive functions for +3.3V, +12V, and +5V outputs. It suits users needing a compact, low-voltage DC solution for specific Mini ITX builds.

Pros

• 300W continuous power output
• Compact 6.38-ounce weight
• Standard 5.5mm/2.5mm DC input connector
• Short-circuit protection included

Cons

• Requires specific 11.2 to 12.6V DC input
• No 80 PLUS efficiency certification listed
• Limited to DC input, not standard AC wall power

Good fit if

• You need a low-profile power supply for a Mini ITX case
• You have a 12V DC power source available
• You want a lightweight unit for small form factor builds

Skip if

• You require standard AC wall outlet input
• You need high-efficiency 80 PLUS Gold or Platinum certification
• You want a fully modular power supply

Verdict: RGEEK 300W Mini ITX DC PSU is a compact option for users with existing 12V DC power sources. It fits small builds but lacks standard AC input and efficiency ratings found in other Mini ITX alternatives.

Specifications side by side

Frequently asked questions

See also

• joyjom aluminum mini itx case alternatives
• akasa aluminium intel lga1700 mini itx alternatives