Thermaltake GF1 Fully Modular ATX 850W
4.4Editor score
80 Plus Gold Certified
Zero RPM Fan Mode
Single 12V Rail
In this guide
Choosing the right power supply is critical for any modern PC build. A fully modular PSU offers the cleanest cable management and best airflow for your system.
We compared ten top models from leading brands like Corsair, MSI, and ASUS. Our analysis focuses on ATX 3.1 compliance, efficiency ratings, and build quality.
Each pick highlights key strengths and ideal use cases. Please note that pricing and availability can change frequently, so check current listings before buying.
Top 3 Picks for Best Fully Modular PSU
CORSAIR RM850x ATX 3.1
4.7Editor score
Cybenetics Gold Efficiency
Native 12V-2×6
Embossed Flexible Cables
ASUS ROG Strix 1000W Platinum
4.8Editor score
80 Plus Platinum Certified
GaN MOSFET Technology
GPU First Voltage Stabilizer
Top 10 Best Fully Modular PSU in 2026 Compared
The following table provides a side by side overview of all ten selected models. It highlights key specifications like wattage, certification, and unique features.
ProductsSpecificationsEditor scorePrice
Best Budget
MSI MAG A850GL PCIE5
850 Watt Capacity
80 Plus Gold
ATX 3.1 Ready
12V2x6 Cable
4.5Editor score
Editor's Choice
CORSAIR RM850e 2025 Black
850 Watt Capacity
105C Capacitors
ATX 3.1 Certified
Low Noise Fan
4.7Editor score
Editor's Choice
CORSAIR RM850x ATX 3.1
850 Watt Capacity
Cybenetics Gold
Native 12V2x6
Embossed Cables
4.7Editor score
CORSAIR RM1000x ATX 3.1
1000 Watt Capacity
Cybenetics Gold
Native 12V2x6
Embossed Cables
4.5Editor score
Thermaltake GF1 Fully Modular
850 Watt Capacity
80 Plus Gold
Zero RPM Fan
140mm Fluid Bearing
4.4Editor score
be quiet! Pure Power 13 M 1000W
1000 Watt Capacity
Cybenetics Platinum
ATX 3.1 Compliant
Semi Passive Zero RPM
4.7Editor score
850W Fully Modular Power Supply
850 Watt Capacity
80 Plus Gold
12V2x6 Connector
Japanese Capacitors
4.6Editor score
ASRock Steel Legend SL-850G
850 Watt Capacity
Cybenetics Platinum
135mm FDB Fan
5V BOOST Function
4.5Editor score
CORSAIR RM850e 2025 White
850 Watt Capacity
ATX 3.1 Certified
Low Noise Fan
White Aesthetic Design
4.6Editor score
ASUS ROG Strix 1000W Platinum
1000 Watt Capacity
80 Plus Platinum
GaN MOSFET
GPU First Stabilizer
4.8Editor score
1. CORSAIR RM850x – Best Overall Fully Modular PSU
CORSAIR RM850x ATX 3.1
850 Watt Max Output
Cybenetics Gold Rated
Native 12V2x6
Fully Modular Design
The CORSAIR RM850x stands out as a top tier choice for builders seeking reliability and modern standards. It carries a Cybenetics Gold rating and supports ATX 3.1 with a native 12V-2×6 connector.
Pros
- Exceptional efficiency ratings
- Native connector for GPUs
- Flexible embossed cables
- Quiet fan operation
- 10 year warranty
Cons
- Higher price point
- Cable sleeves may be tight
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Its key strengths lie in the high efficiency and clean cabling. The embossed cables are flexible enough for tight builds, and the fan remains whisper quiet even under load.
Trade-offs include a slightly higher cost compared to basic models. Some users might find the cable sleeves a bit bulky, though this adds to the aesthetic appeal.
This unit is ideal for high end gaming rigs using RTX 40 series cards. It offers peace of mind with robust protection and a decade of warranty coverage.
Modern Standards Compliance
ATX 3.1 support ensures you can handle transient spikes from new GPUs without adapters.
Aesthetic Build Quality
The embossed cables look premium and allow for superior cable management in clear cases.
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2. Thermaltake GF1 – Best Budget Fully Modular PSU
Thermaltake GF1 Fully Modular
850 Watt Max Output
80 Plus Gold Certified
Smart Zero Fan Mode
140mm Fluid Bearing
The Thermaltake GF1 offers excellent value for budget conscious builders who still want Gold efficiency. It features a Smart Zero Fan that stops completely during low loads.
Pros
- Affordable price point
- 80 Plus Gold efficiency
- Zero RPM silence mode
- Single 12V rail
- Industrial grade protection
Cons
- Less modern than ATX 3.1
- Standard cable lengths
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Its main advantage is the cost effective performance. The 140mm fluid bearing fan ensures it stays quiet, and the single 12V rail provides stable power distribution.
While it lacks the latest ATX 3.1 specs, it handles modern GPUs well for most use cases. The cables are standard flat types which work fine for most mid tower cases.
Choose this if you want a reliable 850W unit without paying for features you might not need. It is a solid entry point into modular power supplies.
Quiet Operation
The fan stops spinning during light use, making it perfect for silent home office PCs.
Reliable Protection
Built-in industrial grade protections guard your components against surges and short circuits.
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3. MSI MAG A850GL PCIE5 – Excellent Compact Fully Modular PSU
MSI MAG A850GL PCIE5
850 Watt Max Output
80 Plus Gold Certified
ATX 3.1 Ready
Compact Gaming Design
MSI delivers a compact and efficient option with the MAG A850GL. It is ready for PCIe 5.1 and includes a native dual color 12V-2×6 cable for easy identification.
Pros
- Fully modular design
- Native PCIe 5.1 cable
- Compact form factor
- 10 year warranty
- Dual color connector
Cons
- Limited wattage headroom
- Simpler feature set
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Its strengths are its size and modern readiness. The compact design fits well in smaller cases, and the Gold certification ensures energy efficiency during gaming sessions.
It lacks the premium features of higher end units, but covers all essentials for a mid range build. The warranty offers long term security for your investment.
Ideal for gamers using high end GPUs in standard or small form factor cases. It balances price and modern specs effectively for most users.
Compact Flexibility
The smaller footprint allows better fit in mid towers without compromising on power delivery.
Visual Connector Design
The dual color cable helps you plug in the GPU power correctly on the first try.
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4. CORSAIR RM850e 2025 – Reliable Modern Fully Modular PSU
CORSAIR RM850e 2025 Black
850 Watt Max Output
105C Capacitors
ATX 3.1 Certified
Modern Standby Ready
The RM850e from Corsair brings 2025 specs to a reliable package. It supports ATX 3.1 and includes a modern standby feature for faster wake times.
Pros
- Modern Standby support
- Quiet 120mm fan
- Steady power delivery
- ATX 3.1 compliant
- Reliable brand
Cons
- Cable sleeves can be stiff
- Standard features only
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It focuses on steady power and low noise. The 105C capacitors ensure longevity, and the fan curve is designed to keep noise down even at full load.
Some users find the cables a bit stiff, which can make routing tricky. However, the performance is consistent, making it a safe choice for daily drivers.
Choose this for a balanced build that values stability over extreme performance. It works well with mainstream gaming PCs and workstations.
Wake Speed
Modern standby compatible mode means your PC wakes from sleep instantly without lag.
Capacitor Quality
High temperature rated capacitors provide a stable electrical performance over many years.
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5. ASUS ROG Strix 1000W Platinum – Premium Fully Modular PSU
ASUS ROG Strix 1000W Platinum
1000 Watt Max Output
80 Plus Platinum Rated
GaN MOSFET Tech
GPU First Stabilizer
The ROG Strix 1000W Platinum is a top tier unit built for enthusiasts. It uses GaN MOSFETs for efficiency and features a patented GPU First voltage stabilizer.
Pros
- Platinum efficiency rating
- Advanced GPU stabilization
- Low noise design
- GaN MOSFETs
- Dual ball fan bearings
Cons
- Highest price tier
- Overkill for basic systems
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Its standout quality is the voltage delivery to the graphics card. This ensures smoother gameplay during spikes. The cooling system is advanced and stays very quiet.
It is expensive compared to standard models, but the performance is unmatched for high end rigs. You pay for premium materials and specialized technology.
Best for extreme gamers or creators who need maximum power headroom. It is a future proof investment for systems with multiple GPUs or heavy workloads.
GPU Performance
The voltage stabilizer enhances delivery to the GPU for unwavering performance during spikes.
Efficiency Tech
GaN MOSFETs allow for a smaller internal layout and cooler operation overall.
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6. be quiet! Pure Power 13 M 1000W – Silent Fully Modular PSU
be quiet! Pure Power 13 M 1000W
1000 Watt Max Output
Cybenetics Platinum
ATX 3.1 Compliant
Semi Passive Zero RPM
be quiet! lives up to its name with this Pure Power 13 M. It delivers 1000W with silent operation thanks to a semi passive zero RPM cooling mode.
Pros
- Exceptional acoustics
- Cybenetics Platinum rated
- Future proof ATX 3.1
- Zero RPM mode
- LLC topology
Cons
- Fan can spin under load
- Higher cost than gold
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The key strength is the noise level. Even under heavy loads, it remains quiet due to optimized fan blades and LLC topology for stable voltage.
While the fan does spin under high demand, the acoustic tuning is excellent. The Platinum efficiency ensures you save on power bills over time.
This is the choice for silent builds or media centers. It handles power excursions well, making it safe for powerful modern processors and GPUs.
Silent Operation
The fan turns off completely during low loads ensuring absolute silence for your home.
Topology Quality
LLC topology provides best in class voltage regulation and efficiency for stability.
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7. Generic 850W Fully Modular PSU – Value Modern Fully Modular PSU
850W Fully Modular Power Supply
850 Watt Max Output
ATX 3.1 Ready
140mm FDB Fan
Japanese Capacitors
This generic 850W unit offers great specs for a budget price. It includes ATX 3.1 compliance and Japanese capacitors for reliability.
Pros
- Competitive price
- Modern ATX 3.1
- Japanese capacitors
- Dragon pattern cables
- Smart fan control
Cons
- Less known brand
- Sleeves are soft
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It stands out for having modern features without the brand tax. The dragon pattern cables add a unique visual touch and the smart fan control is effective.
Some users might hesitate due to the brand recognition, but the 10 year warranty offers good support. It handles transient spikes well per spec.
Choose this for a value build that still wants next gen readiness. It is perfect for gamers wanting modern safety without overspending on branding.
Visual Cable Style
The unique dragon pattern on the cables adds a fun touch to your internal aesthetics.
Component Durability
100 percent Japanese capacitors rated for high heat ensure long term stability.
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8. ASRock Steel Legend SL-850G – Balanced Fully Modular PSU
ASRock Steel Legend SL-850G
850 Watt Max Output
Cybenetics Platinum Rated
135mm FDB Fan
5V BOOST Function
The ASRock Steel Legend SL-850G brings a unique 5V BOOST function to the table. It is certified Platinum by Cybenetics for high efficiency.
Pros
- Cybenetics Platinum certified
- 5V BOOST function
- Dual color cable
- iCool fan control
- Japanese capacitors
Cons
- Fan can be audible under load
- Cable lengths are standard
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Its strength is the stability features. The BOOST function compensates for voltage drops, and the dual color connector helps with correct GPU insertion.
The fan is generally quiet but can be audible under high load. For most users, the trade-off is acceptable for the price and performance.
This unit fits well in mid range builds. It offers solid protection and modern readiness for anyone using new motherboards and graphics cards.
Voltage Stability
The 5V BOOST function helps maintain optimal performance during power spikes and drops.
Fan Technology
The iCool control keeps the fan off during low loads for silent idle periods.
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9. CORSAIR RM850e 2025 White – Aesthetic Fully Modular PSU
CORSAIR RM850e 2025 White
850 Watt Max Output
ATX 3.1 Certified
White Aesthetic Design
Modern Standby Ready
The white version of the RM850e is perfect for builders focused on aesthetics. It offers the same reliable performance as the black variant.
Pros
- White color scheme
- Matches white builds
- ATX 3.1 support
- Modern Standby ready
- Quiet fan curve
Cons
- Same specs as black
- Slightly higher cost
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Its key feature is the visual design. The white casing and cables blend seamlessly into light themed cases without leaving dark spots.
Performance matches the black version exactly so you do not lose on power. It is a great way to finish a clean looking gaming PC setup.
Choose this for any white themed build. It provides all the modern features needed for stability while looking great in your setup.
Visual Consistency
The white color scheme ensures your power supply blends into light cases seamlessly.
Performance Match
It shares all technical features with the black model for identical power delivery.
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10. CORSAIR RM1000x ATX 3.1 – High Wattage Fully Modular PSU
CORSAIR RM1000x ATX 3.1
1000 Watt Max Output
Cybenetics Gold Rated
Native 12V2x6
Embossed Cables
The RM1000x provides ample power for top tier gaming rigs. It supports ATX 3.1 with a native connector and offers 1000W of continuous output.
Pros
- 1000W continuous power
- Cybenetics Gold rated
- Flexible cables
- Native GPU connector
- Low noise fan
Cons
- Premium price
- Extra capacity unused
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Its main benefit is the headroom. Even with high end CPUs and multiple drives, this PSU will not stress. The flexible cables make it easy to manage.
Some may find 1000W excessive for a single GPU system. However, the efficiency and build quality make it a worthwhile investment for future upgrades.
Best for users planning to upgrade over time. It ensures you never run out of power even with future hardware releases demanding more energy.
Future Headroom
The 1000W capacity ensures you have extra power for future component upgrades.
Cable Management
Embossed cables remain flexible and easy to route even in tight spaces.
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Buying Guide – How to Choose the Best Fully Modular PSU
Selecting a power supply requires attention to efficiency, connector types, and warranty. This guide breaks down the key factors to consider for your specific build.
Efficiency Ratings
Efficiency ratings like 80 Plus Gold or Platinum indicate how much power is converted to useful work versus wasted as heat. A higher rating means lower electricity bills and less heat in your case.
Look for at least 80 Plus Gold certification to ensure reliable power delivery without excessive energy waste.
ATX 3.1 Compliance
The ATX 3.1 standard is crucial for modern systems. It ensures your PSU can handle sudden power spikes from new GPUs without shutting down unexpectedly.
Always choose a unit that explicitly supports ATX 3.1 and PCIe 5.1 if you plan to use the latest graphics cards.
Native Connectors
Newer GPUs often use a 12V-2×6 connector. Native support means your PSU has this cable built in rather than needing a clumsy adapter.
A native connector reduces cable clutter and improves safety by eliminating intermediate adapters that can melt under high load.
Modular Design
A fully modular PSU lets you plug in only the cables you need. This reduces clutter inside your case which improves airflow and makes cleaning easier.
Ensure the unit is labeled fully modular to get the full benefit of easy cable management.
Capacitor Quality
High quality capacitors like Japanese ones rated for high temperatures improve stability and lifespan. They protect your system against voltage fluctuations over time.
Check the product details for mentions of Japanese capacitors to ensure long term reliability.
Fan and Noise
Noise levels matter for a comfortable environment. Look for units with fluid bearing fans or zero RPM modes that stop the fan at low loads.
A good fan curve keeps the system quiet during browsing while ramping up only when gaming.
Warranty Coverage
The warranty length often reflects the builder's confidence in the product. Most quality units offer 10 years of coverage which gives peace of mind.
Prioritize brands that provide a decade of warranty for better long term support.
Wattage Requirements
Calculate your total power needs based on your CPU and GPU. A 850W unit suits most high end builds while 1000W is better for extreme setups.
Choose a PSU that offers a 20 percent headroom over your estimated total load for efficiency and longevity.
How to Use and Care for Your Fully Modular PSU
When installing the PSU, plug in only the cables you need for your components. This keeps the interior clean and helps air flow freely to other parts.
Keep your PC case filters clean and dust free to prevent the PSU fan from clogging. A blocked fan will make more noise and reduce cooling efficiency.
Ensure the 12V-2×6 cable is fully seated if your GPU supports it. A loose connection can lead to sparking or failure during heavy usage.
Frequently Asked Questions
What is a fully modular PSU?
A fully modular PSU is a power supply where every single cable can be detached. This allows you to route only the cables you need which improves airflow and aesthetics.
Do I need ATX 3.1?
If you have a new graphics card like the RTX 40 series, ATX 3.1 is highly recommended. It handles power spikes better than older standards and includes native connectors.
Which efficiency rating is best?
80 Plus Gold is the sweet spot for most users. It balances cost and efficiency well. Platinum is better if you want to save on power bills over many years.
Is 850W enough for gaming?
Yes 850W is enough for most high end gaming systems. It supports flagship GPUs and modern CPUs with room for future upgrades.
Do modular cables affect performance?
No modular cables do not affect performance compared to fixed cables. The internal quality matters more. Modular just makes installation easier and cleaner.
How long should a PSU last?
A quality PSU should last at least 7 to 10 years. The components are designed for long term stability with the fan being the first to wear out.
Final Thoughts on Choosing the Best Fully Modular PSU
We found the CORSAIR RM850x to be the best overall choice for modern builds. The Thermaltake GF1 offers great value for budget builders seeking Gold efficiency.
Prioritize ATX 3.1 compliance and native 12V-2×6 connectors if you plan to use the latest GPUs. These features will ensure stability as hardware evolves over time.
Prices and stock change frequently so verify current listings before purchasing. A reliable PSU is an investment in your whole system's safety and longevity.