Best Montech Fully Modular PC Power Supplies in 2026: 2 Picks
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You need reliable power for a modern build. This list of the best montech fully modular PC power supplies helps you find the right unit. We compared 2 models based strictly on published specifications. The top pick is the Montech Century G5 850W Power Supply. It leads because it supports ATX 3.0, ensuring compatibility with modern GPUs. Each option here meets fully modular standards for cleaner cable management. Read on to decide which unit fits your case and wattage needs.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Montech Century G5 850W Power Supply Best overall | Modern GPUs needing ATX 3.0 support | Check price of Montech Century G5 850W Power Supply on Amazon |
| 2 | Montech Century II 1050W ATX 3.1 Best budget | High-wattage ATX 3.1 builds | Check price of Montech Century II 1050W ATX 3.1 on Amazon |
The best fit for you
- You need ATX 3.0 support for modern GPUs Montech Century G5 850W Power Supply The Montech Century G5 850W includes ATX 3.0 compliance for latest graphics cards.
- You require high wattage for ATX 3.1 builds Montech Century II 1050W ATX 3.1 The Montech Century II 1050W offers ATX 3.1 standard and 1050W capacity.
- You want a fully modular power supply design Montech Century G5 850W Power Supply The Montech Century G5 850W features fully modular cables for clean builds.
- You seek the highest wattage option available Montech Century II 1050W ATX 3.1 The Montech Century II 1050W provides 1050W output, the highest on this list.
Our 2 picks
Montech Century G5 850W Power Supply
Best for: Modern GPUs needing ATX 3.0 support
- Modularity
- Fully Modular (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- 80 Plus Gold
- ATX Version
- ATX 3.0
- Warranty
- 5-year
- Dimensions
- 5.51 × 5.9 × 3.38 inches
View on Amazon: Montech Century G5 850W Power Supply Affiliate link
The Montech Century G5 is a fully modular 850W power supply built for modern systems. It meets ATX 3.0 and PCIe Gen 5 standards, supporting high-end graphics cards with stable power delivery. The unit uses a full-bridge LLC design and Japanese capacitors for efficiency. A fluid dynamic bearing fan keeps noise low during operation. This 80 Plus Gold certified unit is ideal for builders who need reliable, silent performance for their components.
Pros
- Fully modular design for clean cable management
- ATX 3.0 and PCIe Gen 5 compliant
- 80 Plus Gold efficiency rating
- Full-bridge LLC resonant converter design
- Fluid dynamic bearing fan for low noise
Cons
- 850W output is lower than the 1050W alternative on this list
- 5-year warranty is shorter than typical premium competitors
- Heavier at 6.22 pounds due to robust internal components
Good fit if
- You are building a PC with a high-end GPU requiring PCIe Gen 5 support
- You prioritize silent operation and efficient power delivery
- You want a fully modular unit for better airflow management
Skip if
- You need more than 850W of total power output
- You require a longer warranty period than five years
- You prefer a lighter power supply for small form factor builds
Verdict: Montech Century G5 850W Gold is a solid choice for users needing ATX 3.0 compatibility and efficient power for modern GPUs, though it offers less wattage than the top 1050W option.
Montech Century II 1050W ATX 3.1
Best for: High-wattage ATX 3.1 builds
- Modularity
- Fully Modular (what this guide is about)
- Wattage
- 1050W
- Efficiency Rating
- 80 Plus Gold
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
- Fan Size
- 135mm
View on Amazon: Montech Century II 1050W ATX 3.1 Affiliate link
This Montech power supply delivers 1050W of power with ATX 3.1 and PCIe 5.1 compliance. It uses a 12V-2x6 cable for modern GPUs and features an 80 Plus Gold efficiency rating. The unit includes a 135mm fan with zero RPM mode and Japanese capacitors. It comes with a 10-year warranty. This model suits users needing high wattage for latest hardware.
Pros
- 1050W output capacity
- ATX 3.1 and PCIe 5.1 ready
- 135mm FDB silent fan with zero RPM mode
- 80 Plus Gold efficiency certification
- 10-year warranty coverage
Cons
- Larger 10-inch width and height compared to standard 6.3-inch units
- Heavier build at 5.29 pounds
- Only available in silver metallic finish
Good fit if
- You need ATX 3.1 support for next-gen GPUs
- You want high efficiency with 80 Plus Gold rating
- You prefer a 135mm fan for quieter operation
Skip if
- You require a compact SFX form factor
- You need a 1200W or higher wattage option
- You prefer a black color scheme
Verdict: Montech Century II 1050W ATX 3.1 is a high-wattage choice for builders using the latest PCIe 5.1 GPUs. Its large dimensions suit spacious cases rather than compact builds.
Specifications side by side
| Spec | Montech Century G5 850W Power Supply | Montech Century II 1050W ATX 3.1 |
|---|---|---|
| Wattage | 850W | 1050W |
| Efficiency Rating | 80 Plus Gold | 80 Plus Gold |
| Modularity | Fully Modular | Fully Modular |
| ATX Version | ATX 3.0 | ATX 3.1 |
| PCIe Connector Type | not stated | 12V-2x6 |
| Fan Size | not stated | 135mm |
| Warranty | 5-year | 10-Year |
| Form Factor | ATX | Compact |
| PCIe Version | not stated | PCIe 5.1 |
| Connector | not stated | 12V-2x6 Connector |
| Size | 850W | 1050W |
| Dimensions | 5.51 × 5.9 × 3.38 inches | 10 × 10 × 10 inches |
| Weight | 6.22 pounds | 5.29 pounds |
| Model | CENTURY G5 850W | 17-959-009 |
| Color | not stated | Silver |
How to choose the right Montech PSU
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Check wattage needs
You must match the wattage to your components. The Montech Century II 1050W offers higher capacity for demanding systems. It suits builders with high-end GPUs or overclocking plans. The Century G5 850W provides sufficient power for most modern mid-range builds. Choose the higher wattage if you plan to upgrade components later. Ensure the unit can handle peak loads without throttling. Lower wattage units may struggle under heavy stress. Always leave headroom for stable operation.
-
Verify ATX version
The ATX version determines connector compatibility. The Century G5 supports ATX 3.0 standards. This includes native support for modern graphics cards. The Century II advances to ATX 3.1. This version offers updated power delivery specifications. You should select the version that matches your motherboard and GPU. Older standards may require adapters. Newer standards provide direct connections. Verify your hardware requirements before purchasing to avoid compatibility issues.
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Measure physical space
Dimensions vary significantly between models. The Century II measures 10 inches in width and height. This large form factor requires a spacious case. The Century G5 is more compact at 5.9 inches wide. It fits into smaller chassis or standard ATX cases. You must check your case’s PSU bay dimensions. Ensure there is enough room for cable management. Larger units may not fit in compact builds. Measure your space before deciding on the model.
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Consider efficiency rating
Both units carry 80 Plus Gold certification. This rating indicates high energy efficiency. You will see less wasted heat and lower electricity bills. Gold certification ensures reliable voltage regulation under load. This stability protects your expensive components. Higher efficiency also reduces noise levels. The fans do not need to spin as fast. You benefit from a quieter and cooler system. Gold is a solid choice for performance builds.
-
Plan cable management
Fully modular designs allow you to connect only needed cables. This reduces clutter inside your case. You can route cables more cleanly. This improves airflow and cooling efficiency. The Montech units offer this flexibility. You can remove unused cables for a tidy build. This feature is essential for small form factor builds. It also makes future upgrades easier. You can swap cables without replacing the entire unit.
Frequently asked questions
Is the Montech Century G5 850W suitable for modern graphics cards?
Yes, it supports ATX 3.0 standards. This version includes native 12VHPWR connectors for modern GPUs. You get 80 Plus Gold efficiency for stable power delivery. The unit measures 5.9 inches wide and 5.51 inches long. It weighs 6.22 pounds. This makes it a solid choice for current high-end builds.
What is the difference between the Century G5 and Century II models?
The main difference is the ATX version and wattage. The Century G5 supports ATX 3.0 with 850W capacity. The Century II supports the newer ATX 3.1 standard with 1050W capacity. Both are fully modular and 80 Plus Gold rated. You should choose based on your specific GPU generation and power needs.
Does the Montech Century II fit in small cases?
No, it is quite large. The Century II measures 10 inches wide, 10 inches high, and 10 inches long. These dimensions suit spacious cases rather than compact builds. You need ample room in your chassis to accommodate this size. Check your case compatibility before purchasing this high-wattage unit for smaller enclosures.
Are these power supplies fully modular?
Yes, both listed models are fully modular. You can connect only the cables you need. This reduces clutter inside your case and improves airflow. The Century G5 and Century II both feature this design. You benefit from easier installation and a cleaner look inside your PC build.
Which Montech PSU is best for ATX 3.1 systems?
The Montech Century II 1050W is the best choice. It specifically supports the ATX 3.1 standard. This ensures compatibility with the latest PCIe 5.1 GPUs. It offers 1050W of power capacity. You get reliable performance for high-wattage builds using the newest hardware standards available on the market today.
What efficiency rating do these Montech power supplies have?
Both models carry the 80 Plus Gold certification. This rating indicates high energy efficiency. You waste less power as heat during operation. The Century G5 and Century II both meet this standard. You enjoy lower electricity costs and cooler running temperatures for your entire system.
How heavy is the Montech Century G5 850W?
It weighs 6.22 pounds. The unit measures 5.9 inches wide, 3.38 inches high, and 5.51 inches long. This weight provides a sturdy build for internal mounting. You can expect a solid feel when handling the unit. The compact dimensions help fit it into various standard ATX cases.