Montech BETA 2 650W ATX Alternatives: 6 Similar Picks Compared
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
The Montech BETA 2 650W ATX 3.1 power supply delivers stable power for high-intensity gaming. It supports ATX 3.1 standards and handles significant GPU power excursions. You might look for montech beta 2 650w atx alternatives if you need a different form factor or modularity level. Some builders prefer semi-modular cables for cleaner installs. Others may require higher wattage or a more compact unit.
This list compares 6 similar power supplies based on their published specifications. We selected these options because their specs overlap with the original product. You will find choices that match the 650W output and ATX 3.1 compatibility. The list includes non-modular, semi-modular, and higher-wattage options. Each entry highlights key attributes like efficiency ratings and physical dimensions. This approach helps you identify the right unit for your specific build requirements without guessing.
How these alternatives compare
Thermaltake Smart BM3 650W Semi-Modular ATX 3.1 PSU
The Thermaltake Smart BM3 650W offers semi-modular cabling, which simplifies cable management compared to the Montech BETA 2’s non-modular design. Both units support ATX 3.1 standards and share 80 Plus Bronze efficiency ratings. However, the Thermaltake model is smaller, measuring 5.9 inches in length versus the Montech’s 10-inch chassis. This compact size may fit tighter cases better. The Thermaltake includes a 5-year warranty, providing longer coverage than the standard terms often found on non-modular units. You should choose this if you want cleaner cable routing without switching to a fully modular system.
ASRock Challenger 550W Bronze Power Supply
The ASRock Challenger 550W drops the ATX 3.1 standard and reduces wattage to 550W, making it less suitable for high-end modern GPUs. It remains non-modular like the Montech BETA 2 but features a smaller form factor at 5.51 inches in length. This unit targets budget builders who do not require the latest PCIe power connectors. While it lacks the 300% GPU power excursion support of the Montech, it provides solid 80 Plus Bronze efficiency for mid-range components. You should pick this alternative if you are building a cost-effective system that does not need ATX 3.1 compatibility or maximum wattage headroom.
Enermax Cyber Source III 850W ATX 3.1 PSU
The Enermax Cyber Source III 850W significantly increases power output to 850W while maintaining ATX 3.1 support. It also supports PCIe 5.1, offering broader compatibility for future graphics cards compared to the Montech BETA 2. Like the Montech, it is non-modular, but it features a much smaller physical footprint at 5.51 inches in length. This compact design allows it to fit in cases where the larger Montech chassis might not. You should consider this option if you need extra wattage for high-end components but still prefer a non-modular setup with a smaller physical profile.
darkFlash EMT650 650W Non-Modular Bronze
The darkFlash EMT650 650W matches the Montech BETA 2 in wattage and efficiency rating, both offering 80 Plus Bronze performance. It is also non-modular, sharing the same cable management approach. However, the darkFlash unit is physically smaller, measuring 5.91 inches in length compared to the Montech’s 10-inch length. It lacks the specific ATX 3.1 branding found on the Montech, which may affect compatibility with the latest GPU power connectors. You should choose this alternative if you need a 650W Bronze unit for a standard build and require a smaller chassis size that fits more easily into compact enclosures.
ASRock PRO 650W ATX 3.1 Power Supply
The ASRock PRO 650W ATX 3.1 shares the same 650W wattage, ATX 3.1 standard, and 80 Plus Bronze efficiency as the Montech BETA 2. It is also non-modular. The key difference is the cooling system, which uses a 120mm fan instead of the standard size often found in larger PSUs. This may result in quieter operation at low loads. The ASRock unit is also more compact, measuring 5.51 inches in length versus the Montech’s 10-inch chassis. You should pick this if you prioritize quieter cooling and a smaller form factor while still needing full ATX 3.1 support for modern systems.
SAMA B650 650W ATX 3.1
The SAMA B650 650W ATX 3.1 matches the Montech BETA 2 in wattage and ATX 3.1 support. It also supports PCIe 5.1, ensuring compatibility with the latest graphics cards. Like the Montech, it is non-modular. However, the SAMA unit is significantly smaller, measuring 5.5 inches in length compared to the Montech’s 10-inch length. It weighs less at 2.87 pounds, making it lighter and easier to handle during installation. You should choose this alternative if you need ATX 3.1 compatibility and 650W of power but require a compact, lightweight power supply that fits into smaller cases without sacrificing modern connectivity standards.
Quick picks
Our 7 picks
Montech BETA 2 650W ATX 3.1
Best for: ATX 3.1 gaming builds needing stable power
- Wattage
- 650W
- Efficiency Rating
- 80 Plus Bronze
- Modularity
- Non-Modular
- ATX Version
- ATX 3.1
- Fan Size
- 120mm
- Warranty
- 5-Year
This non-modular power supply delivers 650W of power with ATX 3.1 compliance. It meets 80 Plus Bronze efficiency standards and supports high-intensity gaming through 200% system peak wattage and 300% GPU power excursion handling. The unit measures 10 by 7.9 by 3.95 inches. You get stable voltage regulation via advanced DC to DC topology. It suits builders who need reliable GPU support without the complexity of modular cabling.
Pros
- ATX 3.1 standard compliance
- Supports 300% GPU power excursions
- 80 Plus Bronze efficiency rating
- Advanced DC to DC topology
Cons
- Non-modular design requires managing all cables
- Bronze efficiency is lower than Gold or Platinum options
- Fixed 650W output limits headroom for high-end builds
Good fit if
- You need ATX 3.1 compatibility for modern GPUs
- You prefer a non-modular unit for simplicity
- You want stable voltage regulation for gaming
Skip if
- You require modular cabling for clean builds
- You need higher than 650W capacity
- You prioritize Gold or higher efficiency ratings
Verdict: Montech BETA 2 650W ATX 3.1 fits users who need ATX 3.1 support and stable power delivery without modular cabling complexity.
Thermaltake Smart BM3 650W Semi-Modular ATX 3.1 PSU
Best for: Mid-range builds needing ATX 3.1 and semi-modularity
- Wattage
- 650W
- Efficiency Rating
- 80Plus Bronze
- Modularity
- Semi-Modular
- ATX Version
- ATX 3.1
- Fan Size
- 120mm
- Warranty
- 5 Year
View on Amazon: Thermaltake Smart BM3 650W Semi-Modular ATX 3.1 PSU
This 650W power supply meets ATX 3.1 and PCIe 5 standards for modern hardware. It uses Japanese 105°C main capacitors and a 120mm fluid dynamic bearing fan. The semi-modular design reduces cable clutter. It carries a 5-year warranty. This unit suits users who want reliable efficiency and current connectivity standards without the bulk of full modularity.
Pros
- ATX 3.1 and PCIe 5 ready
- Semi-modular cable management
- 120mm fluid dynamic bearing fan
- 5-year warranty coverage
- Japanese 105°C main capacitor
Cons
- Semi-modular design leaves some cables attached
- Bronze efficiency rating is lower than Gold options
- 120mm fan may be louder than 135mm alternatives
Good fit if
- You need ATX 3.1 compatibility for new GPUs
- You want to manage cables but keep costs down
- You prefer a 5-year warranty for peace of mind
Skip if
- You require full modularity for clean builds
- You need higher than 80 Plus Bronze efficiency
- You plan to use a GPU exceeding 650W capacity
Verdict: Thermaltake Smart BM3 650W Semi-Modular fits builders who need ATX 3.1 support and semi-modular flexibility. It is a solid choice for mid-range systems that prioritize modern standards and a 5-year warranty.
ASRock Challenger 550W Bronze Power Supply
Best for: budget mid-range builds without ATX 3.1 needs
- Wattage
- 550W
- Efficiency Rating
- 80 PLUS Bronze
- Modularity
- Non-Modular
- ATX Version
- ATX 2.52
- PCIe Connector Type
- 6+2-pin PCIe
- Fan Size
- 120mm
The ASRock Challenger 550W is a non-modular power supply designed for mid-range builds. It delivers 550W of continuous power with an 80 PLUS Bronze efficiency rating. The unit features a 120mm fan and includes standard ATX, CPU, and PCIe cables. It supports ATX 2.52 standards and offers a 5-year warranty. This unit suits users needing reliable basic power without the complexity of modular cabling.
Pros
- 550W continuous power output on the +12V rail
- 80 PLUS Bronze efficiency certification for reduced heat
- 120mm Golf-Blade fan for quiet operation under load
- 5-year manufacturer warranty coverage
- Includes all necessary connectors for standard builds
Cons
- Lower 550W wattage compared to 650W competitors
- Non-modular design results in unused cable clutter
- Lacks ATX 3.1 standard compliance for newer GPUs
Good fit if
- You need a budget-friendly power supply for mid-range components
- You prefer a non-modular setup for simplicity
- You want a unit with a 5-year warranty
Skip if
- You require ATX 3.1 compatibility for latest graphics cards
- You need more than 550W of continuous power
- You want a modular design for cleaner cable management
Verdict: ASRock Challenger 550W Non-Modular fits users building mid-range systems on a budget who do not need ATX 3.1 features or modular cabling. It provides solid efficiency and a long warranty for basic needs.
Enermax Cyber Source III 850W ATX 3.1 PSU
Best for: High-wattage ATX 3.1 builds
- Wattage
- 850 Watt
- Efficiency Rating
- 80 Plus Bronze
- Modularity
- Non-Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
- Fan Size
- 120mm
This Enermax power supply delivers 850 watts of power with an 80 Plus Bronze efficiency rating. It supports ATX 3.1 and PCIe 5.1 standards, featuring a 12V-2x6 connector for modern GPUs. The unit includes a 120mm fan with fluid dynamic bearings for quiet operation. It is a non-modular design that suits users needing higher wattage without the complexity of modular cables.
Pros
- 850W output capacity
- ATX 3.1 and PCIe 5.1 support
- 12V-2x6 native connector
- 120mm fluid dynamic bearing fan
Cons
- Non-modular cable design
- Only 80 Plus Bronze efficiency
- Heavier build at 3.57 pounds
Good fit if
- You need 850W for high-end GPUs
- You want ATX 3.1 compatibility
- You prefer non-modular simplicity
Skip if
- You require full modularity
- You need 80 Plus Gold efficiency
- You want a smaller form factor
Verdict: Enermax Cyber Source III 850W Non-Modular fits users who need extra headroom for modern graphics cards. It offers solid ATX 3.1 support and quiet operation in a straightforward non-modular package.
darkFlash EMT650 650W Non-Modular Bronze
Best for: budget mainstream gaming and office desktops
- Wattage
- 650W
- Efficiency Rating
- 80 PLUS Bronze
- Modularity
- Non-Modular
- PCIe Connector Type
- 6+2-pin
- Fan Size
- 120mm
- Warranty
- 5 Years
The darkFlash EMT650 is a 650W non-modular power supply with 80 PLUS Bronze efficiency. It delivers up to 648W on the +12V rail, supporting mainstream gaming and office builds. The unit uses Japanese 105C capacitors and a 120mm Fluid Dynamic Bearing fan for stable operation. It includes six protections and a five-year warranty. This PSU suits users who need reliable performance without the complexity of modular cabling.
Pros
- 650W rated output with 648W on the +12V rail
- 80 PLUS Bronze efficiency certification
- Japanese 105C electrolytic capacitors for stability
- 120mm Fluid Dynamic Bearing fan for quieter operation
- Six built-in protections including OVP and OCP
Cons
- Non-modular design results in unused cable clutter
- No ATX 3.1 or PCIe 5.1 native support
- Lower 80 PLUS Bronze efficiency compared to Gold options
Good fit if
- You are building a mainstream gaming PC on a budget
- You prefer simple cable routing with flat black cables
- You need a reliable PSU with a five-year warranty
Skip if
- You require ATX 3.1 compatibility for new GPUs
- You want modular cables for a clean build
- You need higher than 80 PLUS Bronze efficiency
Verdict: The darkFlash EMT650 650W Non-Modular Bronze fits budget-conscious builders who need stable power for mainstream components without the hassle of modular cables.
ASRock PRO 650W ATX 3.1 Power Supply
Best for: Standard ATX builds needing ATX 3.1 support
- Wattage
- 650W
- Efficiency Rating
- 80 PLUS Bronze
- ATX Version
- ATX 3.1
- Fan Size
- 120mm
- Warranty
- 3-Year
- Dimensions
- 5.51 × 5.91 × 3.39 inches
The ASRock PRO-650B is a 650W power supply certified for 80 PLUS Bronze efficiency. It supports ATX 3.1 standards and includes a 120mm fan for quiet operation. The unit delivers 54.1A on the +12V rail, ensuring stable power for modern CPUs and graphics cards. You will appreciate the flat cables for clean builds. It is a solid choice for users seeking reliable performance with standard ATX form factor compatibility.
Pros
- 80 PLUS Bronze efficiency rating
- ATX 3.1 compatibility
- 120mm fan for quiet cooling
- 54.1A +12V rail output
Cons
- 3-year warranty is shorter than competitors
- Non-modular cable design
- 86mm height limits some small cases
Good fit if
- You need ATX 3.1 support
- You prefer a 120mm fan
- You want 650W of power
Skip if
- You require a modular design
- You need a longer warranty
- You want 80 Plus Gold efficiency
Verdict: ASRock PRO-650B 650W Bronze PSU fits users who prioritize ATX 3.1 compatibility and quiet 120mm fan cooling. It is ideal for standard builds where a 3-year warranty and non-modular cables are acceptable trade-offs for reliable 650W output.
SAMA B650 650W ATX 3.1
Best for: Mainstream gaming PCs needing ATX 3.1 support
- Wattage
- 650W
- Efficiency Rating
- 80 PLUS Bronze, Cybenetics Silver
- Modularity
- Non-Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
- Fan Size
- 120mm
The SAMA B650 is a 650W non-modular power supply built for modern gaming PCs. It meets ATX 3.1 standards and includes a native 12V-2x6 connector for PCIe 5.1 GPUs. The unit carries an 80 PLUS Bronze efficiency rating with a Cybenetics Silver certification. A 120mm sleeve-bearing fan provides cooling. Its compact 140 x 150 x 86mm form factor fits standard desktop cases.
Pros
- ATX 3.1 and PCIe 5.1 ready with native 12V-2x6 connector
- 80 PLUS Bronze efficiency with Cybenetics Silver certification
- Half-Bridge LLC and DC-DC topology for stable voltage
- 120mm temperature-adaptive sleeve-bearing fan
Cons
- Non-modular cable design limits clean cable management
- Sleeve-bearing fan may have a shorter lifespan than fluid dynamic bearing options
- 12V-2x6 connector supports up to 450W, which may limit extreme high-end GPU setups
Good fit if
- You need a reliable 650W source for mid-range gaming builds
- You want ATX 3.1 compliance with native PCIe 5.1 support
- You prefer a compact non-modular unit for standard cases
Skip if
- You require modular cables for a cleaner build aesthetic
- You are building a high-end system with GPUs exceeding 450W power draw
- You prefer a larger 140mm fan for quieter operation
Verdict: SAMA B650 650W Bronze ATX 3.1 is a practical choice for users building mainstream gaming PCs who need modern GPU connectivity without the cost of modularity. It suits builders prioritizing efficiency and compact size over cable management flexibility.
Specifications side by side
| Spec | Montech BETA 2 650W ATX 3.1 | Thermaltake Smart BM3 650W Semi-Modular ATX 3.1 PSU | ASRock Challenger 550W Bronze Power Supply | Enermax Cyber Source III 850W ATX 3.1 PSU | darkFlash EMT650 650W Non-Modular Bronze | ASRock PRO 650W ATX 3.1 Power Supply | SAMA B650 650W ATX 3.1 |
|---|---|---|---|---|---|---|---|
| Wattage | 650W | 650W | 550W | 850 Watt | 650W | 650W | 650W |
| Efficiency Rating | 80 Plus Bronze | 80Plus Bronze | 80 PLUS Bronze | 80 Plus Bronze | 80 PLUS Bronze | 80 PLUS Bronze | 80 PLUS Bronze, Cybenetics Silver |
| Modularity | Non-Modular | Semi-Modular | Non-Modular | Non-Modular | Non-Modular | not specified | Non-Modular |
| ATX Version | ATX 3.1 | ATX 3.1 | ATX 2.52 | ATX 3.1 | not specified | ATX 3.1 | ATX 3.1 |
| PCIe Connector Type | not specified | not specified | 6+2-pin PCIe | 12V-2x6 | 6+2-pin | not specified | 12V-2x6 |
| Fan Size | 120mm | 120mm | 120mm | 120mm | 120mm | 120mm | 120mm |
| Warranty | 5-Year | 5 Year | 5 Years | not specified | 5 Years | 3-Year | not specified |
| Form Factor | ATX | ATX | ATX | ATX | ATX | ATX | ATX |
| PCIe Version | not specified | not specified | not specified | PCIe 5.1 | not specified | not specified | PCIe 5.1 |
| Power Factor Correction | not specified | not specified | not specified | not specified | Active PFC | not specified | not specified |
| Size | not specified | 650W | 550B | 850W | 80 Plus Bronze 650 W | 650W | Bronze B650 Black |
| Dimensions | 10 × 7.9 × 3.95 inches | 5.9 × 5.5 × 3.4 inches | 5.51 × 5.91 × 3.39 inches | 5.51 × 5.91 × 3.39 inches | 5.91 × 5.51 × 3.35 inches | 5.51 × 5.91 × 3.39 inches | 5.5 × 5.9 × 3.3 inches |
| Weight | not specified | 3.5 pounds | not specified | 3.57 pounds | 4 pounds | not specified | 2.87 pounds |
| Model | BETA 2 650W | PS-SPD-0650MNFABU-3 | 90-UXC055-BNUAAA | EMB850EWT-NAC | EMT650 | 90-UXR065-BNUAA2 | BTX-650-1BA3 |
| Color | not specified | Black | Black | Black | Black | Black | Black |
Frequently asked questions
Is the Thermaltake Smart BM3 650W semi-modular?
Yes, the Thermaltake Smart BM3 650W is a semi-modular power supply. This design lets you connect only the cables you need, reducing clutter inside your case. It supports ATX 3.1 standards and maintains an 80 Plus Bronze efficiency rating for reliable performance in mid-range builds.
Does the ASRock Challenger 550W support ATX 3.1?
No, the ASRock Challenger 550W does not list ATX 3.1 support in its specifications. It is a non-modular unit designed for budget mid-range builds. It provides solid efficiency with an 80 Plus Bronze rating but lacks the modern GPU connectivity features found in newer ATX 3.1 models.
What is the wattage of the Enermax Cyber Source III?
The Enermax Cyber Source III provides 850W of power. It is a non-modular unit that supports ATX 3.1 standards and PCIe 5.1 connectivity. This higher wattage offers extra headroom for modern graphics cards, making it suitable for high-wattage builds that need stable power delivery under heavy loads.
Is the darkFlash EMT650 a modular power supply?
No, the darkFlash EMT650 is a non-modular power supply. It delivers 650W of power with an 80 Plus Bronze efficiency rating. This design is practical for budget-conscious builders who want stable power for mainstream components without the complexity or cost associated with modular cabling systems.
Does the ASRock PRO 650W have a 120mm fan?
Yes, the ASRock PRO 650W features a 120mm fan for cooling. It supports ATX 3.1 standards and provides 650W of output. The larger fan size helps maintain quiet operation during standard gaming or office tasks, while its non-modular design keeps the build straightforward and compact.
Does the SAMA B650 support PCIe 5.1?
Yes, the SAMA B650 supports PCIe 5.1 connectivity. It is a non-modular power supply that adheres to ATX 3.1 standards. This combination allows it to handle modern GPU power requirements efficiently, making it a practical choice for mainstream gaming PCs that need reliable power without modular cable management.