PUSOKEI ATX-250W PC Power Supply
5.0Editor score
Adjustable 115/230V voltage switch
Thermal sensor controls fan speed
Long 1.1meter power cord
In this guide
Finding the right power supply for your computer is essential for stability and longevity. A 250W unit fits many office PCs and small form factor builds. It ensures your system runs quietly and efficiently without wasting energy.
We reviewed ten real products based on user feedback and technical specifications. Each unit offers different connectors and voltages for various needs. Our list covers OEM replacements and general purpose supplies for common desktop types.
Every pick shows key specs and verified ratings from actual buyers. Prices may change often so check current listings before ordering. This guide helps you match the right wattage and form factor to your machine safely.
Top 3 Picks for Best 250W PSU
QNAP 250W Delta Power Supply
5.0Editor score
Delta brand reliability and quality
Designed for NAS system use
Stable 250 Watt output power
New for 4600 6600 6900 250W Power Supply
5.0Editor score
80 PLUS PLATINUM certification
Input voltage 100-240V
Total output 250W maximum
Top 10 Best 250W PSU in 2026 Compared
The following table lists each product with its core specifications for quick comparison. Use this to identify the right connector type and form factor for your specific desktop or server hardware requirements today.
ProductsSpecificationsEditor scorePrice
Best Budget
PUSOKEI ATX-250W
Adjustable voltage 115/230V
Thermal fan speed control
1.1meter power cord length
Low energy consumption design
5.0Editor score
Editor's Choice
YX299-250W SFF PSU
SFF form factor design
Check YX299 compatibility first
Replacement for specific systems
Compact size for small cases
Editor's Choice
QNAP 250W Delta Power Supply
Delta brand power supply
250 Watt rated power
Designed for NAS devices
High reliability for storage
5.0Editor score
New for 4600 250W Supply
80 PLUS PLATINUM certified
Input 100-240V range
4 pin CPU connector
Desktop and server use
5.0Editor score
Thermaltake Smart 500W PSU
500 Watt continuous output
80 PLUS White certified
120mm ultra quiet fan
Five year warranty included
4.6Editor score
Dell OptiPlex 250W PSU
OEM Dell part number
For OptiPlex 390 790
250 Watt power rating
Desktop DT form factor
4.5Editor score
FSP 250-50GUB Flex ATX
Flex ATX form factor
80 Plus Bronze certified
4 x 4 cm fan
Full range PFC active
4.5Editor score
H250ad-00 250W Supply
For Dell Optiplex 390
High quality durable materials
Compatible part numbers listed
Easy replacement installation
4.5Editor score
250W NAS Power Supply
Compatible TS439 TS669
24 pin + 20 pin
Input 100-240V range
Max power 250W
4.6Editor score
QNAP PWR-PSU-250W-DT04
QNAP Delta power supply
Retail package included
250 Watt capacity
Designed for QNAP units
1. PUSOKEI ATX-250W – Best Budget 250W PSU
PUSOKEI ATX-250W
Adjustable 115/230V voltage
Thermal fan speed control
1.1meter power cord length
Low energy consumption design
This unit delivers reliable 250W power with high customer satisfaction. It features a manual voltage switch and thermal fan control. The clear connector marks simplify installation for beginners working on old desktops.
Pros
- Clear connector markings for easy install
- Auto fan speed via thermal sensor
- Flexible voltage switch for travel
- Long cord reaches far outlets
- Quiet for basic desktop use
Cons
- Basic build for simple systems
- Limited connectors for expansion
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Users appreciate the flexibility of the 115/230V switch which works globally. The thermal sensor keeps noise down by adjusting fan speed automatically. A long power cord ensures you can reach outlets without extension strips.
While not for high end builds it suits low energy needs well. It is best for simple office PCs or home media boxes. The trade off is fewer connectors but this matches its basic purpose nicely.
Buy this if you need a cheap reliable replacement for basic rigs. It saves energy and runs quietly in small setups. Check your voltage needs before buying to ensure compatibility with your region.
Easy installation with clear markers
The clear markings on connectors help users plug cables in correctly without guessing which port goes where.
Smart thermal fan control
A built in thermal sensor adjusts fan speed based on internal temperature to reduce noise during light tasks.
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2. YX299-250W SFF PSU – Replacement PSU for SFF
YX299-250W SFF PSU
SFF form factor design
Check YX299 compatibility first
Replacement for specific systems
Compact size for small cases
This unit is a specialized replacement for small form factor systems. It matches the YX299 model for compatibility. Users must check their equipment before purchase to ensure it fits and works properly.
Pros
- Fits small form factor cases
- Direct replacement for YX299
- Compact size saves space inside
Cons
- No rating data available
- Verify compatibility before buying
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The compact design allows it to fit in tight cases where standard ATX units cannot go. It provides 250W which is enough for integrated graphics office PCs. The focus is on fit rather than extra features.
Without user ratings it is wise to read seller notes carefully. Ensure your system part number matches before ordering. This reduces return hassles and ensures you get the right hardware for your build.
Buy this if your SFF case needs an exact YX299 replacement. It keeps your small system running without buying a new chassis. Confirm dimensions and connectors first to avoid fit issues later.
Specialized SFF replacement
This power supply is designed specifically for small form factor cases that require a compact 250W unit like YX299.
Compatibility check required
Users must verify their system part number matches YX299 before purchasing to ensure the unit fits and functions correctly.
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3. QNAP 250W Delta Power Supply – Best NAS PSU
QNAP 250W Delta Power Supply
Delta brand power supply
250 Watt rated power
Designed for NAS devices
High reliability for storage
This Delta power supply is ideal for NAS storage systems. It has perfect ratings from users who need stable power for drives. The brand is known for quality which reduces failure risks in always on units.
Pros
- Delta brand known for reliability
- Perfect for NAS systems
- High quality internal components
- Stable power for drives
- Excellent user ratings
Cons
- Higher price point
- NAS specific connectors
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NAS devices need clean power to avoid data loss during writes. This unit delivers 250W with low noise and high efficiency. The connectors match common NAS chassis so installation is straightforward for techs.
The cost is higher than generic units but reliability justifies it. You avoid drive failures caused by bad power. If your NAS is critical for work or media this upgrade is worth the extra expense today.
Buy this if you own a QNAP or similar NAS. It keeps your storage safe and system quiet. Check your model compatibility first to ensure the connectors match your device chassis slots.
Ideal for NAS systems
NAS devices need stable power to protect data on hard drives making this Delta unit a perfect choice for storage servers.
Delta brand reliability
Delta is a trusted name in power supplies known for quality components that reduce failure risks in always on systems.
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4. New for 4600 250W Supply – Best Premium PSU
New for 4600 6600 250W Power Supply
80 PLUS PLATINUM certified
Input 100-240V range
4 pin CPU connector
Desktop and server use
This unit offers platinum efficiency in a 250W form factor. It supports full voltage range and fits desktop and server chassis. Users rate it perfectly for its build quality and reliable power delivery.
Pros
- 80 PLUS PLATINUM efficiency
- Full voltage range input
- Desktop and server rated
- High quality build materials
- Perfect user rating
Cons
- Specific model fit required
- Check part number carefully
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The 80 PLUS PLATINUM rating means very low wasted energy and heat. This reduces electricity costs over time even at low load. The input range makes it usable worldwide without manual switch adjustments needed.
Ensure your device part number matches before ordering to avoid returns. It is built for durability but connectors vary by model. Verify dimensions and pinouts to ensure it fits your specific system board.
Buy this for efficient reliable power in office or small server PCs. The efficiency rating saves money on energy bills. Double check part numbers to confirm it matches your existing system requirements.
80 PLUS PLATINUM efficiency
The platinum efficiency rating ensures very low energy waste which saves electricity costs and reduces heat inside your computer case.
Full voltage range
Input voltage from 100 to 240 volts works worldwide so you can use this supply in any region without manual switching.
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5. Thermaltake Smart 500W PSU – Higher Wattage Option
Thermaltake Smart 500W PSU
500 Watt continuous output
80 PLUS White certified
120mm ultra quiet fan
Five year warranty included
This unit delivers 500W which exceeds 250W but adds headroom. It has a large quiet fan and five year warranty. Thermaltake is a trusted brand for power supplies and general PC builds.
Pros
- 500W for future upgrades
- Quiet 120mm cooling fan
- Five year warranty support
- Standard ATX connector fit
- Trusted brand name
Cons
- More than 250W needed
- White efficiency vs higher
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If your system might grow this extra power helps. The 120mm fan stays quiet even under load. The five year warranty shows confidence in its durability and component quality over long use.
It may be larger than some 250W cases. Ensure your case fits standard ATX size before buying. The efficiency is white level but that is fine for basic use cases.
Buy this if you need more power than 250W offers. It fits standard ATX cases and runs quietly. Check your case dimensions to ensure the larger size fits inside your current setup.
500W for future headroom
This unit offers 500 Watts which lets you upgrade components later without replacing the power supply again soon.
Five year warranty
Thermaltake includes a five year warranty which shows confidence in the build quality and provides long term support for your PC.
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6. Dell OptiPlex 250W PSU – OEM Replacement
Dell OptiPlex 250W PSU
OEM Dell part number
For OptiPlex 390 790
250 Watt power rating
Desktop DT form factor
This is a genuine Dell OEM part for OptiPlex desktops. It fits models like 390 790 990 DT. Users report good reliability and easy installation for office PC repairs.
Pros
- Genuine Dell OEM parts
- Perfect fit for 390 790
- Reliable power for office PCs
- Listed part numbers help
- Solid user feedback
Cons
- OEM specific connectors
- Check model before buying
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The connectors match Dell proprietary layouts so it works perfectly without adapters. Part numbers are listed so you can confirm it matches your old unit. This reduces guesswork and return issues.
It is built for standard office loads and small business PCs. Not for high end gaming but stable for daily tasks. Verify your exact model number to avoid connector mismatches during install.
Buy this if you own an OptiPlex 390 790 990. It restores original performance and stability. Confirm your model number matches the listing to ensure compatibility and fit.
Genuine OEM quality
As a genuine Dell OEM part it guarantees the exact fit and performance needed for OptiPlex 390 790 990 DT desktop computers.
Listed part numbers
Multiple part numbers like 7GC81 and H250AD-00 are listed so you can confirm it matches your current system unit.
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7. FSP 250-50GUB Flex ATX – Compact Bronze PSU
FSP 250-50GUB Flex ATX
Flex ATX form factor
80 Plus Bronze certified
4 x 4 cm fan
Full range PFC active
This FSP unit uses Flex ATX form factor for compact builds. It has bronze efficiency and full range PFC active. It fits in small cases where standard ATX does not work.
Pros
- Flex ATX fits small cases
- Bronze efficiency rating
- Full range PFC active
- Multiple safety protections
- FSP trusted brand
Cons
- 40mm fan may be loud
- Flex size less common
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The 4 x 4 cm fan provides airflow but may be louder than larger units. Bronze certification saves energy compared to non rated units. Multiple protections guard against over voltage and short circuits safely.
Ideal for mini PCs and small office units. Ensure your case supports Flex ATX before buying. It is a reliable brand for custom builds needing small power units.
Buy this for mini PC builds needing efficient 250W. The Flex ATX size fits tight spaces. Verify your case supports Flex ATX to ensure proper physical fit.
Flex ATX compact size
Flex ATX form factor allows this unit to fit into small mini PC cases where standard ATX power supplies will not fit.
Bronze efficiency
80 Plus Bronze certification means better energy efficiency than non rated units which lowers electricity use and heat inside the case.
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8. H250ad-00 250W Supply – Dell Compatible
H250ad-00 250W Supply
For Dell Optiplex 390
High quality durable materials
Compatible part numbers listed
Easy replacement installation
This replacement supply fits many Dell Optiplex models. It uses high quality materials and has twelve month warranty. Extensive part numbers help confirm it matches your system unit.
Pros
- Works for many Dell models
- High quality durable materials
- Extensive part number list
- Easy installation guide
- Twelve month warranty
Cons
- Check model compatibility
- Aftermarket not OEM
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The unit is designed for easy replacement in about ten minutes. Users appreciate the material quality and support if issues occur. It works for multiple series like 390 3010 990 790 DT.
It is not OEM but works well for repairs. Verify your part number to avoid mismatches. Good for fixing older office PCs when OEM parts are hard to find.
Buy this to repair Dell Optiplex desktops cost effectively. Confirm your model number matches the compatible list. Use the included guide to ensure easy installation and safe power.
Extensive part compatibility
An extensive list of part numbers helps you confirm this unit matches your specific Dell Optiplex model before purchase.
Easy installation guide
The unit includes guidance to help you complete the replacement in about ten minutes without needing special tools.
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9. 250W NAS Power Supply – NAS Replacement
250W NAS Power Supply
Compatible TS439 TS669
24 pin + 20 pin
Input 100-240V range
Max power 250W
This replacement works for many NAS models like TS439 to TS669. It uses 24 pin and 20 pin connectors for main power. Input voltage range supports worldwide use.
Pros
- Fits many NAS models
- 24 pin + 20 pin connectors
- Full voltage input range
- Stable 250W output
- Good user rating
Cons
- Specific to NAS units
- Check pin types
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NAS units need stable power to keep storage working. This supply offers 250W which is enough for most small NAS drives. The 20 and 24 pin connectors match common NAS systems.
Ensure your NAS matches the listed models before ordering. It is a direct replacement to restore function. Check pin types to ensure your cables fit properly.
Buy this if your NAS has power issues and matches the list. It restores function to storage units efficiently. Confirm your model matches the list to ensure connection fit.
Fits many NAS models
This replacement supply is designed to work with common NAS models like TS439 TS453 and TS669 for storage system repairs.
24 pin plus 20 pin
The unit provides both 24 pin and 20 pin connectors which match the main power input on many NAS and desktop systems.
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10. QNAP PWR-PSU-250W-DT04 – Premium NAS PSU
QNAP PWR-PSU-250W-DT04
QNAP Delta power supply
Retail package included
250 Watt capacity
Designed for QNAP units
This is a QNAP branded Delta power supply for NAS. It comes in a retail package. It matches QNAP units exactly for fit and compatibility.
Pros
- QNAP branded unit
- Delta power technology
- Retail package protection
- Exact NAS fit
- High quality build
Cons
- Higher cost
- Check model
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Delta technology ensures clean stable power for storage. Retail packaging helps protect during shipping and storage. It is designed specifically for QNAP systems to avoid fit issues.
The cost is higher but matches official parts. Verify your model before buying to ensure compatibility. It is ideal for users who want original parts.
Buy this for QNAP systems needing exact replacement. It ensures correct fit and safe power. Confirm your NAS model to ensure it matches the part number.
QNAP branded fit
This unit is branded by QNAP so it matches their NAS chassis and connectors exactly without needing adapters.
Retail package protection
It comes in a retail package which helps protect the power supply during shipping and storage before you install it.
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Buying Guide – How to Choose the Best 250W PSU
Choosing the right 250W PSU requires checking form factor and connectors. This guide explains what factors matter most for desktops and NAS units.
Form Factor
Ensure the PSU size fits your case. ATX is standard for desktops. Flex ATX and SFF fit smaller cases.
Verify dimensions before buying to avoid return.
Connectors
Check main power pin type. 20 or 24 pin is common. Desktops need 4 pin CPU. NAS units have specific layouts.
Mismatched connectors prevent startup.
Voltage Range
Some units have manual 115/230V switches. Others support full range. Check your region voltage.
Full range units reduce switch errors.
Brand and OEM
OEM units guarantee fit for branded PCs. Generic units work if connectors match. Delta and FSP are trusted.
OEM is safer for business PCs.
Efficiency Rating
Look for 80 PLUS Bronze or higher. It reduces electricity waste and heat. Non rated units use more power.
Bronze or Platinum saves on bills.
Fan and Noise
Thermal fans adjust to load. Larger fans are quieter. Small 40mm fans can be noisy.
Check noise level for quiet use.
Cable Length
Ensure cords reach your outlet. 1.1 meter is common. Extensions add clutter.
Longer cords simplify placement.
Warranty
Check warranty length. Some offer two or five years. This shows build confidence.
Longer warranty means safer bet.
How to Use and Care for Your 250W PSU
Power off your PC before swapping the PSU to avoid shock. Ground yourself to prevent static damage to components.
Plug cables securely into matching ports. Use the right connectors for CPU and main power.
Keep vents clear of dust. Clean the fan gently to avoid overheating.
Frequently Asked Questions
Is 250W enough for a desktop PC?
Yes 250W is enough for most office desktops and NAS units with integrated graphics. It is not enough for gaming PCs with dedicated graphics cards.
Can I use a 250W PSU in a larger case?
Yes you can use it in ATX cases if connectors match. However standard ATX PSUs offer better cable management and airflow.
Do all 250W PSUs use 24 pin connectors?
No some use 20 pin or proprietary layouts. Check your motherboard manual before buying to ensure connector match.
What is the difference between OEM and generic?
OEM matches the original part number for branded PCs. Generic units are cheaper but you must verify connectors and fit yourself.
How do I check voltage for my PSU?
Look for a switch on the rear. 115/230V requires manual switch. Full range units switch automatically without user input.
Why do NAS PSUs cost more?
They use higher quality parts for stability. NAS runs 247 so reliability prevents drive failure and data loss.
Final Thoughts on Choosing the Best 250W PSU
We found the PUSOKEI unit for budget office builds and the QNAP Delta for storage. Both offer reliability for specific use cases.
Focus on connectors and form factor before considering cost. Mismatched units waste time and money.
Prices vary by region and stock. Verify current listings before buying to ensure you get the best deal today.