PUSOKEI ATX-250W PC Power Supply
5.0Editor score
Adjustable 115/230V voltage
Thermal sensor controls fan speed
Includes 1.1meter power cord
In this guide
Finding the right 250W PSU is essential for powering low-energy desktop systems and network storage devices efficiently. A reliable unit ensures stable performance and protects your hardware from voltage fluctuations during operation.
We evaluated ten leading power supply units based on compatibility, efficiency ratings, and build quality. Our list includes OEM replacements and third-party options suitable for various form factors and system requirements.
Each pick highlights specific strengths like noise levels, connector types, and warranty coverage. Please note that prices and availability may change frequently, so verify details before making your final purchase decision.
Top 3 Picks for Best 250W PSU
Thermaltake Smart 500W 80+ White Certified PSU
4.6Editor score
120mm Ultra Quiet Cooling Fan
Active PFC Power Factor Correction
5 Year Warranty included
QNAP Systems PWR-PSU-250W-DT04
Delta 250W Power Supply
Retail packaging included
Official QNAP replacement
Top 10 Best 250W PSU in 2026 Compared
This side-by-side comparison highlights the key specifications and compatibility details for each power supply unit listed below to help you make an informed decision.
ProductsSpecificationsEditor scorePrice
Best Budget
PUSOKEI ATX-250W
250 Watt Rated Output
115/230V Adjustable Voltage
Thermal Fan Control
US Plug Standard
5.0Editor score
Editor's Choice
YX299-250W SFF PSU
Small Form Factor Design
Check YX299 Compatibility
250 Watt Capacity
Replacement Unit
Best Premium
QNAP 250W Delta
Delta Power Supply Brand
250 Watt Power Provided
NAS Compatible
Official Replacement Part
5.0Editor score
New for 4600 6600
80 PLUS Platinum Certified
Desktop and Server Use
4 Pin CPU Connector
250W Max Output
5.0Editor score
Thermaltake Smart 500W
500 Watt Continuous Output
80 PLUS White Certified
ATX 12V V2.3
100000 Hours MTBF
4.6Editor score
Genuine Dell OEM OptiPlex
OEM OptiPlex 390 790
250 Watt PSU
Multiple Part Numbers
Desktop System Fit
4.5Editor score
FSP 250-50GUB Flex ATX
Flex ATX Form Factor
80 Plus Bronze Certified
Full Range PFC
4 x 4 cm Fan
4.5Editor score
H250ad-00 Dell Optiplex
250W Power Supply
Many Dell Models Support
High Quality Materials
12 Months Warranty
4.5Editor score
250W Power Supply Replacement NAS
24 + 20 Pin Connector
NAS TS Series Support
100-240V Input
Max 250W Power
4.6Editor score
QNAP Systems PWR-PSU-250W
PWR-PSU-250W-DT04 Model
Delta Power Supply
Retail Packaging
QNAP Original Part
1. PUSOKEI ATX-250W – Best Overall Budget PSU
PUSOKEI ATX-250W PC Power Supply
250 Watt Rated Power
Adjustable Voltage Switch
Thermal Fan Control
1.1 Meter Cord Length
The PUSOKEI ATX-250W PC Power Supply is a reliable option for low energy desktop systems. It has a perfect rating and stands out for its adjustable voltage settings.
Pros
- Clear connector markings
- Low noise operation
- Manual voltage switching
- Auto fan speed control
- Adequate cord length
Cons
- Basic build quality
- Limited brand support
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Its thermal sensor automatically controls fan speed to maintain quiet operation. The clear connector markings make installation quick and effective for users.
While it lacks premium features, the manual voltage switching adds flexibility. The 1.1 meter power cord is long enough for daily use needs.
Buyers seeking a simple 250W PSU for basic tasks should consider this unit. It offers excellent value for budget constrained system builds.
Easy Installation Process
Clear connector markings bring quick and effective installation for users.
Flexible Voltage Options
The 115/230V manual switching voltage is adjustable and convenient.
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2. YX299-250W SFF PSU – Best Compact Form Factor
YX299-250W SFF PSU
Small Form Factor Design
YX299 Compatibility Check
250 Watt Capacity
System Replacement Unit
This YX299-250W SFF PSU is designed for specific small form factor systems. It serves as a replacement unit for equipment requiring this exact part.
Pros
- SFF compatible size
- Direct replacement option
- Compact footprint
- Specific model support
- Targeted compatibility
Cons
- Verify part number first
- Limited documentation
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Users must check part YX299 for functionality and compatibility with their equipment. The compact design fits where standard units cannot.
The lack of detailed specs requires careful verification before purchase. It is a niche product for specific hardware configurations.
If your system needs a YX299 compatible unit this is a direct solution. Ensure compatibility to avoid installation issues.
Compatibility Verification
Please check part YX299 for functionality and compatibility with your equipment.
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3. QNAP 250W Delta – Best for NAS Systems
QNAP 250W Delta Power Supply
Delta Power Supply Brand
250 Watt Power Provided
NAS Equipment Support
Official Replacement Unit
The QNAP 250W Delta Power Supply is an original replacement for NAS systems. It has a perfect 5.0 rating and provides reliable power for storage units.
Pros
- Delta quality brand
- 5 NAS rating
- 250 Watt capacity
- Direct NAS fit
- Original equipment grade
Cons
- Higher price point
- Model specific use
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Delta is a well respected brand in power supply manufacturing. The 250 watt output ensures stable operation for network storage devices.
Its high price reflects its OEM status and targeted compatibility. It is not meant for general PC builds.
NAS owners needing a genuine replacement should choose this unit. It ensures compatibility and performance for your storage system.
Delta Brand Reliability
Delta is a trusted name in power supply manufacturing for NAS systems.
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4. New for 4600 6600 – Best Platinum Certified
New for 4600 6600 6900 8600 4900 10Pin 250W Power Supply
80 PLUS Platinum Certified
Desktop and Server App
4 Pin CPU Connector
250W Max Output
This power supply offers 80 PLUS Platinum certification for high efficiency. It supports multiple desktop and server models like the 4600 and 6600.
Pros
- Platinum efficiency rating
- Multiple model support
- 5.0 user rating
- Desktop and server use
- Detailed part numbers
Cons
- Check part number carefully
- Replacement specific unit
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The 4 pin CPU connector and 250W max output meet specific system needs. Users give it a perfect 5.0 rating for performance.
Verify the confirmation picture and part number before purchasing to ensure fit. The detailed part list helps identify compatibility.
Systems needing platinum efficiency and specific model support will benefit. Check your part number to confirm this unit works.
Efficiency Certification
This unit features 80 PLUS Platinum certification for high energy efficiency.
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5. Thermaltake Smart 500W – Best Value Upgrade
Thermaltake Smart 500W 80+ White Certified PSU
500 Watt Continuous Power
80 PLUS White Certified
ATX 12V V2.3
100000 Hours MTBF
The Thermaltake Smart 500W delivers more power for those needing headroom. It has an 80 PLUS White certification and a 120mm ultra quiet cooling fan.
Pros
- Higher 500W output
- 120mm ultra quiet fan
- Active PFC included
- Industry grade protections
- 5 Year Warranty
Cons
- Larger than 250W units
- Different connector layout
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Compliance with Intel ATX 12 Volt 2.31 standards ensures broad compatibility. Active PFC improves power efficiency and system performance.
It includes industry grade protections like OVP and SCP for safety. The 5 year warranty adds peace of mind for buyers.
Consider this if you want higher wattage and better cooling. It is a solid upgrade from standard 250W units.
Enhanced Cooling
The 120mm ultra quiet cooling fan ensures stable temperatures.
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6. Genuine Dell OEM OptiPlex – Best OEM Replacement
Genuine Dell OEM OptiPlex 390 790 990 DT Desktop 250 Watt PSU
OEM OptiPlex 390 790
250 Watt PSU
Multiple Part Numbers
Desktop System Fit
This is a genuine Dell OEM power supply for OptiPlex systems. It supports models like 390 790 and 990 DT desktops.
Pros
- Genuine Dell OEM
- Perfect fit 390 790
- Multiple part numbers
- 4.5 rating
- Official quality grade
Cons
- OEM price level
- Dell specific only
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The multiple part numbers like 7GC81 and 6MVJH ensure broad compatibility. It is designed to fit perfectly into these specific cases.
OEM parts provide original quality and reliability. The 4.5 rating confirms user satisfaction with this replacement unit.
Dell OptiPlex owners looking for a direct replacement should choose this. It matches the original specifications perfectly.
Direct OEM Fit
This OEM unit fits Dell OptiPlex 390 790 and 990 DT desktops exactly.
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7. FSP 250-50GUB – Best Flex ATX Option
FSP 250-50GUB Flex ATX Power Supply
Flex ATX Form Factor
80 Plus Bronze Certified
Full Range PFC
4 x 4 cm Fan
The FSP 250-50GUB is a Flex ATX power supply for compact builds. It holds an 80 Plus Bronze certification for efficiency.
Pros
- Flex ATX compatible
- 80 Plus Bronze rated
- Quiet small fan
- Full protection suite
- FSP brand reliability
Cons
- Specific form factor
- Higher than basic units
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Full range active PFC helps maintain stable power across input voltages. The quiet 4 x 4 cm fan keeps noise levels low.
It includes protection against OVP UVP OCP OPP and SCP for safety. FSP is a known manufacturer of reliable power units.
Systems requiring Flex ATX size will find this unit suitable. It balances efficiency and form factor well.
Compact Design
This Flex ATX unit fits compact cases needing smaller dimensions.
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8. H250ad-00 250W – Best Third Party Dell Replacement
H250ad-00 250W Power Supply for Dell Optiplex
250W Power Supply
Many Dell Models Support
High Quality Materials
12 Months Warranty
This replacement unit works with many Dell Optiplex models like 390 and 3010. It uses high quality durable materials for longevity.
Pros
- Compatible with many models
- High quality materials
- Better than OEM claims
- 12 months warranty
- Easy replacement
Cons
- Verify model carefully
- Third party warranty
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The compatibility list includes part numbers like CYY97 and 7GC81 for broad support. It claims to be better than OEM parts in quality.
Installation takes less than 10 minutes to get your supply working. The 12 months warranty covers any potential issues.
Buyers wanting a cost effective alternative to OEM can choose this. Confirm your model number before purchasing.
Broad Compatibility
This unit supports a wide range of Dell Optiplex desktop models.
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9. 250W Power Supply Replacement – Best for TS Series
250W Power Supply Replacement for NAS
24 + 20 Pin Connector
NAS TS Series Support
100-240V Input
Max 250W Power
This 250W power supply replacement is designed for specific NAS models. It supports TS series units like TS-439 and TS-459.
Pros
- 24 pin + 20 pin
- NAS TS compatible
- Global voltage input
- 4.6 user rating
- Specific model support
Cons
- Connector check needed
- NAS specific unit
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The connector configuration includes 24 pin + 20 pin options. It accepts 100-240V input for global voltage compatibility.
With a 4.6 rating users trust this replacement for their storage needs. The max power output meets standard NAS requirements.
NAS owners with these models should verify the connector type first. It offers a cost effective solution for power issues.
Global Input Support
This unit accepts 100-240V input for worldwide use.
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10. QNAP Systems PWR-PSU-250W-DT04 – Premium QNAP OEM
QNAP Systems PWR-PSU-250W-DT04
PWR-PSU-250W-DT04 Model
Delta Power Supply
Retail Packaging
QNAP Original Part
This QNAP Systems unit is a premium original power supply. It features Delta power technology in retail packaging for easy handling.
Pros
- QNAP original part
- Retail packaging included
- Delta power tech
- Official support
- High end option
Cons
- High price point
- Limited availability
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As an official QNAP part it ensures perfect integration with supported systems. The Delta branding indicates high quality engineering.
Its higher price reflects its premium status and brand authenticity. It is for users seeking the best possible replacement.
QNAP system owners wanting the highest grade component should consider this. Verify your model compatibility before purchase.
Original QNAP Part
This is an official QNAP original part with retail packaging.
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Buying Guide – How to Choose the Best 250W PSU
Choosing the right power supply involves checking compatibility and efficiency ratings carefully.
System Compatibility
Ensure the PSU matches your computer case size and connector layout. For Dell OptiPlex or QNAP systems use OEM or certified replacements to fit perfectly.
Always check the part numbers and form factor before buying to avoid returns.
Efficiency Ratings
Look for 80 PLUS certifications like Bronze or Platinum to ensure energy efficiency. Higher ratings mean less heat and lower electricity bills over time.
Choose a unit that meets your efficiency goals for long term savings.
Connector Types
Verify that the power connectors match your motherboard and drives. Some models need specific pins like 24+20 or 4 pin CPU connectors.
Double check the cable types to ensure they fit your internal components.
Warranty Coverage
A longer warranty period protects you from manufacturing defects. Brands like Thermaltake offer 5 year coverage while third parties offer 12 months.
Prioritize units with solid warranty terms for peace of mind.
Build Quality
OEM units often use higher grade components than generic replacements. Check for details on internal protection circuits like OVP and SCP.
Invest in reliable builds to protect your valuable hardware from damage.
Noise Levels
Thermal sensors and larger fans help keep operation quiet. Look for descriptions mentioning silent or ultra quiet cooling features.
Choose a quiet fan for home or office environments.
Input Voltage Range
Ensure the PSU supports your local voltage range like 100-240V. Some units have manual switches while others have auto switching.
Select a power supply with the correct input for your location.
Brand Reputation
Stick with known brands like Delta or FSP for reliability. Reading user reviews can help confirm real world performance.
Choose brands with a history of producing durable power supplies.
How to Use and Care for Your 250W PSU
Unplug all power and open your system case carefully. Disconnect the old PSU cables from the motherboard and drives.
Install the new PSU in the correct orientation with screws provided. Connect the main power cables securely to the motherboard.
Close the case and plug in the power. Ensure the unit boots up and all components work before finalizing.
Frequently Asked Questions
Is a 250W PSU enough for a basic PC?
Yes, a 250W PSU is sufficient for basic office PCs without dedicated graphics cards. It handles standard processors and storage drives well. Avoid heavy gaming tasks with this limit.
How do I check PSU compatibility?
Check your case size and the connectors on your motherboard. Compare the part numbers like 7GC81 or YX299 with your current unit. Verify the voltage range matches your region.
What does 80 PLUS Bronze mean?
80 PLUS Bronze indicates the PSU meets specific efficiency standards. It converts power with minimal waste which saves electricity. It is a mid tier rating for energy efficiency.
Can I use any Dell PSU for my computer?
No, you must ensure the part number matches your specific model. Dell uses proprietary connectors that vary by case size. Using the wrong one may not fit.
Why is the price so different for these PSUs?
Prices vary based on brand and efficiency ratings. OEM parts are pricier than third party units. Higher wattage units like Thermaltake offer more headroom.
Do all 250W PSUs have the same connectors?
No, connector types vary by manufacturer and system. Some need 24 pin while others use 20+4 pin. Always check the connector layout before buying.
How long should a PSU last?
A good quality PSU can last many years under normal use. Look for units with high MTBF ratings. Proper ventilation helps extend its lifespan.
What happens if I use a low quality PSU?
Low quality units may fail and damage other components. They often lack safety protections like short circuit protection. Always choose a reliable unit.
Final Thoughts on Choosing the Best 250W PSU
We reviewed ten top options ranging from OEM replacements to efficient third-party units. Each serves specific needs like NAS or desktop compatibility.
Prioritize compatibility and efficiency when making your choice. Consider warranty terms to protect your investment.
Remember that prices change so verify current availability before ordering. Check the product details to match your specific system requirements.