GAMEMAX SFX Power Supply 850W
4.2Editor score
80 Plus Gold Certified
Japanese Capacitors Included
Full Modular Design
In this guide
Choosing the right power supply for a compact build is critical. An 850W SFX unit delivers high wattage in a small footprint, ideal for modern gaming PCs that demand strong GPU support without sacrificing space.
We evaluated ten leading models based on efficiency ratings, modular cabling, cooling performance, and compliance with the latest ATX 3.1 and PCIe 5.1 standards. Each option was assessed for real-world suitability.
This list highlights key strengths and weaknesses for every model. Prices fluctuate often, so verify current listings before purchasing. Use these insights to select a reliable core for your next custom PC project.
Top 3 Picks for Best 850W Sfx Power Supply
Cooler Master V850 SFX Gold
4.4Editor score
ATX 3.1 Compliant
Enhanced Thermal Dissipation
90 Degree Durable Cables
be quiet! Pure Power 13 M 850W
4.6Editor score
Zero RPM Cooling Mode
94.4 Percent Efficiency
ATX 3.1 Ready
Top 10 Best 850W Sfx Power Supply in 2026 Compared
The following table provides a concise side-by-side comparison of all ten products. It highlights key technical specifications and efficiency certifications to help you quickly identify the model that fits your specific build requirements and budget constraints.
ProductsSpecificationsEditor scorePrice
Editor's Choice
Cooler Master V850 SFX
ATX 3.1 Compliant
80 Plus Gold Rated
12VHPWR Connector
Enhanced Cooling
4.4Editor score
Editor's Choice
CORSAIR SF850 2024
80 Plus Platinum Rated
ATX 3.0 Ready
Fully Modular
92mm PWM Fan
4.3Editor score
Best Premium
Vetroo 850W SFX
ATX 3.1 Ready
80 Plus Gold
Fully Modular
SFX Bracket Support
4.6Editor score
GAMEMAX SFX 850W
80 Plus Gold
Japanese Capacitors
12VHPWR Connector
Full Modular
4.2Editor score
Lian Li SP0850P
80 Plus Platinum
Smart Cooling Fan
Japanese Capacitors
SFX to ATX Bracket
4.1Editor score
be quiet! Pure Power 13 M
80 Plus Gold
Zero RPM Cooling
ATX 3.1
12V-2×6 Native
4.6Editor score
Thermaltake Toughpower SFX
80 Plus Platinum
ATX 3.1
Full Modular
90mm FDB Fan
4.2Editor score
Super Flower Combat SFX
Cybenetics Gold
ATX 3.1
Full Modular
Ribbon Cables
4.5Editor score
CORSAIR SF850 Renewed
80 Plus Platinum
ATX 3.0
Fully Modular
92mm PWM Fan
5.0Editor score
Lian Li SX0850P
80 Plus Platinum
ATX 3.1
120mm FDB Fan
Flexible Cables
4.5Editor score
1. Cooler Master V850 SFX – Best Overall 850W Sfx Power Supply
Cooler Master V850 SFX
ATX 3.1 Compliant
80 Plus Gold Rated
90 Degree Cables
Enhanced Cooling
The Cooler Master V850 SFX Gold stands out as a top contender for high-wattage small form factor builds. With a 4.4 rating from verified buyers, it delivers reliable power and modern connectivity options.
Pros
- High efficiency rating
- Robust build quality
- Modern connector support
- Custom cable lengths
- Strong thermal design
Cons
- Higher price point
- Cables may be short
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It supports ATX 3.1 and PCIe 5.1 with native cables, ensuring compatibility with the latest GPUs. The 90-degree connectors improve routing in tight cases, while the amorphous metal components enhance thermal efficiency.
Some users note that cable lengths might need extension for larger cases using SFX-to-ATX brackets. However, the design prioritizes neatness in standard ITX chassis, making clutter minimal for most compact systems.
This unit is ideal for gamers and creators needing maximum performance in a small chassis. Its mix of efficiency and future-proofing justifies the cost for serious builders planning long-term upgrades.
Next-Gen Connector Support
The native 12VHPWR connector simplifies connections for modern graphics cards without needing bulky adapters.
Thermal Efficiency
Internal components like the amorphous metal transformer reduce heat buildup, keeping temperatures stable under load.
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2. CORSAIR SF850 – Premium Low Noise Option
CORSAIR SF850 2024
80 Plus Platinum Rated
ATX 3.0 Ready
Type-5 Connectors
105C Capacitors
The CORSAIR SF850 (2024) offers massive power in a tiny frame, rated for Platinum efficiency. Its fluid dynamic bearing fan ensures low noise, making it perfect for quiet home office or gaming PCs.
Pros
- High Platinum efficiency
- Semi-passive cooling
- Compact footprint
- Modular cabling
- Quiet fan operation
Cons
- Type-5 cables may be proprietary
- Expensive compared to competitors
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ATX 3.0 compliance means it handles power spikes well, protecting your components during gaming sessions. The fully modular design reduces cable clutter, which is critical in small cases where airflow is limited.
While Type-5 connectors are great for neatness, they limit third-party cable compatibility. Also, the price is higher than some rivals, but you are paying for brand reliability and advanced engineering.
Choose this if silence and efficiency are your top priorities. It is a strong investment for users who want a high-end PSU that fits both SFX and ATX cases seamlessly.
Efficiency Performance
Platinum efficiency means less wasted energy and heat, which keeps your system cooler and lowers electricity bills over time.
Fan Noise Control
The PWM fan spins only when necessary, allowing for silent operation during low-load tasks like browsing or document editing.
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3. GAMEMAX SFX 850W – Best Budget Option
GAMEMAX SFX 850W
80 Plus Gold
Japanese Capacitors
12VHPWR Connector
Full Modular
For budget-conscious builders, the GAMEMAX SFX 850W provides excellent value. It delivers 850W of power with Gold efficiency, ensuring you do not compromise on safety or performance despite the lower cost.
Pros
- Affordable price
- Gold efficiency certified
- Modern ATX 3.0 support
- Full modular cables
- Solid protection features
Cons
- Shorter cable lengths
- Limited brand recognition
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It includes a 12VHPWR connector for next-gen GPUs, making it future-ready. The full modular design helps organize cables in small cases, improving airflow and aesthetics without extra expense.
Some users may find cable lengths slightly shorter than premium units, requiring careful planning. However, for standard ITX cases, they are sufficient. Protection circuits guard against power issues effectively.
This is a great choice for first-time builders or those on a tight budget. It offers the essential features needed for a modern compact build without the premium price tag.
Value Proposition
You get high wattage and modern connectors at a fraction of the cost of other major brands, making it accessible for many.
Modern Standards
ATX 3.0 and PCIe 5.0 readiness ensure it works with new hardware without needing extra adapters or converters.
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4. Vetroo 850W SFX – Solid Value Choice
Vetroo 850W SFX
ATX 3.1 Ready
80 Plus Gold
Fully Modular
SFX Bracket Support
The Vetroo 850W SFX impresses with a high rating despite its budget-friendly price. It is fully modular and ready for ATX 3.1 standards, supporting the latest GPUs efficiently.
Pros
- High user rating
- ATX 3.1 compliance
- Affordable pricing
- Modular cable design
- Versatile bracket
Cons
- Less known brand
- Basic cable quality
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Its compatibility with SFX-to-ATX brackets adds versatility, allowing it to fit in standard cases too. The design focuses on delivering power where it is needed most without unnecessary extras.
While cable quality is decent, it may not match premium options in flexibility. However, for most builds, it is sufficient. The high user rating reflects satisfaction with performance and value.
Choose this if you want modern standards without overspending. It is a practical option for gamers who need reliable power for their systems on a strict budget.
Future-Proofing
Ready for the newest power standards so your build remains relevant as hardware technology advances in the coming years.
Budget Friendly
Offers a competitive price point that makes high-wattage SFX power accessible to more users without sacrificing key features.
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5. Lian Li SP0850P – Quiet Operation
Lian Li SP0850P
80 Plus Platinum
Smart Cooling Fan
Japanese Capacitors
SFX to ATX Bracket
Lian Li SP0850P is designed for quiet operation, featuring a fanless mode at low loads. This makes it ideal for silent builds where noise is a primary concern for the user.
Pros
- Platinum efficiency
- Fanless mode available
- Flexible cables
- Stable voltage
- Compact design
Cons
- Lower fan speed options
- Higher cost
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It comes with a bracket for ATX compatibility, adding flexibility. The platinum rating ensures high efficiency, which reduces heat output. Japanese capacitors provide long-term reliability and stability.
While it costs more than basic models, the silent operation feature is unique. Some users may need to ensure airflow is adequate since the fan does not spin at low loads.
Pick this unit for media centers or quiet office PCs. It balances power and silence well, offering a premium experience for those who value a peaceful environment.
Fanless Mode
At low loads, the fan stops completely, ensuring total silence during light tasks like web browsing or document work.
Efficiency
Platinum efficiency minimizes energy waste, keeping your system cool and lowering your monthly power consumption costs.
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6. be quiet! Pure Power 13 M – Silent Power
be quiet! Pure Power 13 M
80 Plus Gold
Zero RPM Cooling
ATX 3.1
12V-2×6 Native
The be quiet! Pure Power 13 M excels in silence and efficiency. Its Zero RPM fan mode ensures complete quietness during low-demand scenarios, which is great for office environments or home setups.
Pros
- Excellent efficiency
- Silent under low load
- Native PCIe 5.1 support
- Strong voltage regulation
- Compact form factor
Cons
- Price point
- Cable length options
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With ATX 3.1 compliance and native 12V-2×6 connectors, it handles modern GPUs effortlessly. The single 12V rail provides stable power delivery for demanding applications like gaming or content creation.
Some users report higher pricing than budget brands, but the performance justifies it. The brand is known for reliability, and the included protection features ensure safety during power surges.
Choose this if quiet operation is critical for your workspace. It offers a premium build quality and features that support long-term stability and efficiency.
Zero RPM Mode
The fan stays off until necessary, reducing noise levels significantly during light usage scenarios like web browsing.
Efficiency
High efficiency reduces heat generation, making it easier to keep your compact PC cool even in tight enclosures.
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7. Thermaltake Toughpower SFX – Reliable Warranty
Thermaltake Toughpower SFX
80 Plus Platinum
ATX 3.1 Ready
Low Ripple Noise
7 Year Warranty
Thermaltake Toughpower SFX offers robust performance with a 7-year warranty, providing peace of mind for long-term users. Its Platinum rating ensures efficiency, while ATX 3.1 standards support new hardware.
Pros
- Strong warranty coverage
- Platinum efficiency
- Modern standards ready
- Low noise ripple
- Full modular
Cons
- Limited availability
- Fan size constraints
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Low ripple noise means clean power for your components, which is vital for stable gaming performance. The 90mm FDB fan balances cooling and acoustics effectively in most SFX cases.
Some users may find the unit slightly larger than standard SFX units, so checking case compatibility is wise. However, its stability and protection features make it a solid choice.
Ideal for users seeking long-term reliability and strong support. This unit is a great fit for those who prioritize warranty and performance in compact builds.
Warranty Value
A seven-year warranty demonstrates manufacturer confidence, offering extra security for your investment against manufacturing defects.
Power Quality
Clean power delivery protects sensitive components from voltage fluctuations that could cause instability or hardware failure.
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8. Super Flower Combat SFX – Solid Efficiency
Super Flower Combat SFX
Cybenetics Gold
ATX 3.1 Ready
Full Modular
Ribbon Cables
Super Flower Combat SFX brings solid performance to the budget market. With Cybenetics Gold certification, it ensures efficient energy use, while ATX 3.1 readiness supports latest GPU standards.
Pros
- Good efficiency
- Flexible ribbon cables
- Modern support
- Auto voltage detection
- Solid construction
Cons
- Brand familiarity
- Cable routing complexity
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Ribbon cables simplify routing in tight spaces, reducing clutter significantly. The auto voltage detection allows operation across different voltage ranges, making it versatile for international travel or setups.
Some users may find ribbon cables slightly more difficult to route initially. However, once installed, they look clean. It offers good value for those wanting efficiency without high cost.
Choose this for versatile power and ease of use. It is a practical choice for gamers needing reliable power in compact systems without breaking the bank.
Cable Management
Flat ribbon cables take up less space, making it easier to route cables neatly around small case fans.
Efficiency
Gold certification ensures you get good energy savings and reduced heat generation for a longer system lifespan.
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9. CORSAIR SF850 Renewed – Great Value
CORSAIR SF850 Renewed
80 Plus Platinum
ATX 3.0 Ready
Fully Modular
SFX Bracket Included
The CORSAIR SF850 Renewed offers premium features at a lower price. It retains the Platinum rating and modular design, ensuring reliable performance for small cases and high-wattage systems.
Pros
- High customer rating
- Reduced cost
- Same premium features
- Includes bracket
- Quiet operation
Cons
- Renewed status
- Warranty terms
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Customers appreciate the reduced cost while getting essentially the same functionality as new units. The included SFX-to-ATX bracket adds value, making it versatile for different case types.
Buying renewed means checking warranty terms carefully, but reviews indicate high satisfaction. It is a smart choice for budget-savvy builders who still want quality and efficiency.
Select this if you want to save money without sacrificing core performance. It brings premium reliability within reach for those willing to consider renewed options.
Value Savings
Renewed units offer significant cost savings while maintaining most performance characteristics of the original brand new product.
Performance
Platinum efficiency ensures consistent power delivery, keeping your components stable during demanding tasks like gaming.
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10. Lian Li SX0850P – Compact Power
Lian Li SX0850P
80 Plus Platinum
ATX 3.1 Ready
Flexible Cables
Smart Cooling
The Lian Li SX0850P delivers reliable power with flexible cables for easy routing. Its Platinum rating and ATX 3.1 support make it suitable for modern, high-performance compact gaming rigs.
Pros
- Platinum efficiency
- Flexible cabling
- ATX 3.1 ready
- Smart fan tech
- High durability
Cons
- Price point
- Fan noise at load
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Smart cooling technology ensures the fan operates only when needed, reducing noise during low tasks. Japanese capacitors enhance durability, allowing the unit to handle high thermal stress over time.
While slightly more expensive, the build quality justifies the cost. The flexible cables help reduce clutter significantly. It is ideal for those prioritizing aesthetics and efficiency.
Choose this for high-end compact builds. It offers a strong combination of efficiency and design, perfect for enthusiasts who value every detail in their system.
Cable Flexibility
Flexible cables simplify routing and reduce bulk, improving airflow and visual appeal inside tight chassis designs.
Durability
High-rated capacitors ensure long-term stability, protecting your investment against power surges and heat stress.
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Buying Guide – How to Choose the Best 850W Sfx Power Supply
Selecting the right power supply involves weighing efficiency, form factor, and future compatibility. This section outlines key factors to consider before making a purchase decision.
Efficiency Ratings
Efficiency ratings like 80 Plus Gold or Platinum indicate how much power is wasted as heat. Higher ratings mean better energy savings and cooler operation.
Look for Gold or higher ratings to ensure optimal performance and lower electricity costs over time.
ATX 3.1 and PCIe 5.1
Modern GPUs require specific connectors like 12VHPWR or 12V-2×6. Ensure your PSU supports ATX 3.1 standards for native compatibility.
Check that the unit includes the necessary cables to avoid using adapters that could reduce safety or stability.
Modularity
Fully modular PSUs allow you to connect only the cables you need. This reduces clutter and improves airflow in tight spaces.
Always opt for full modularity when possible to keep your compact build clean and organized.
Fan and Cooling
Noise levels depend on fan quality and smart cooling modes. Units with Zero RPM or semi-passive modes stay silent at low loads.
Choose a model with fluid dynamic bearings for longevity and quieter operation during intensive tasks.
Warranty and Brand
Warranty length reflects manufacturer confidence in the product. A longer warranty usually means better build quality and support.
Stick with reputable brands to ensure you get reliable customer service if issues arise.
Cable Length and Type
SFX cases have limited space. Check cable lengths to ensure they reach without tension or strain.
Flexible or ribbon cables can make routing easier and cleaner in cramped chassis environments.
Budget Constraints
Prices vary widely based on features. Set a budget that balances performance and cost-effectiveness for your needs.
Sometimes a lower-cost model offers enough power and safety features for a standard gaming setup.
Case Compatibility
Ensure your chosen PSU fits your case. Some SFX models are slightly larger than standard specifications.
Use the provided SFX-to-ATX brackets if you plan to install it in a standard ATX chassis for better airflow.
How to Use and Care for Your 850W Sfx Power Supply
Install the power supply securely in your case using the provided screws, ensuring airflow vents align with case fans. Proper positioning prevents dust buildup and ensures optimal cooling performance.
Connect only the necessary cables to your components to reduce clutter. Secure excess length neatly using ties to avoid obstructing airflow inside the compact case.
Periodically check for dust accumulation and clean vents gently with compressed air. Avoid moving the PC excessively while powered on to protect internal components from vibration.
Frequently Asked Questions
Do I need a specific case for 850W SFX power supplies?
Most 850W SFX units fit standard small form factor cases designed for SFX power supplies. If you have an ATX case, you may need an SFX-to-ATX bracket to mount the unit securely.
Are ATX 3.1 power supplies worth the extra cost?
Yes, especially if you plan to use newer GPUs that require 12VHPWR connectors. These units offer better power handling for transient spikes and future-proof your build against hardware updates.
How do I choose between Gold and Platinum ratings?
Platinum units waste less power as heat and are quieter under load. If noise and efficiency are your top priorities, go Platinum. For general gaming, Gold is often sufficient and more budget-friendly.
Can I use a standard SFX case with an ATX power supply?
No, SFX cases are too small for ATX units. You must use an SFX PSU to fit the dimensions. Some cases support both, but SFX is standard for compact builds.
What happens if I exceed the power supply wattage?
Exceeding wattage can cause system instability, shutdowns, or hardware damage. Always ensure your GPU and CPU draw less than the PSU rating for a safe headroom margin.
How often should I replace my power supply?
PSUs can last many years if properly maintained. However, replacing every 5-7 years ensures you have modern features and safety standards, especially if you upgrade other components frequently.
Do modular power supplies affect power delivery quality?
No, fully modular power supplies offer the same electrical quality as non-modular ones. The modular design only affects cabling convenience and case airflow management.
Is it safe to use a refurbished power supply?
Refurbished units from trusted sellers are generally safe. However, verify warranty terms carefully. Ensure the unit was tested professionally before use to avoid potential electrical hazards.
Final Thoughts on Choosing the Best 850W Sfx Power Supply
Choosing the right 850W SFX power supply depends on your balance of budget, efficiency, and future needs. The top picks offer a range of options from premium quiet units to cost-effective modular solutions.
Prioritize ATX 3.1 compatibility if you plan to upgrade GPUs soon. High efficiency ratings and proper modularity will keep your build clean, quiet, and energy-efficient over time.
Prices change frequently so check current listings before buying. Use the comparison table and reviews to guide your decision and find the perfect power core for your compact PC.