CORSAIR CX550 80 Plus Bronze Non Modular Low-Noise ATX vs Thermaltake Smart BM3 750W 80Plus Bronze ATX 3.1 &
Updated August 2026 — CORSAIR CX550 80 Plus Bronze Non Modular Low-Noise ATX wins on noise level, Thermaltake Smart BM3 750W 80Plus Bronze ATX 3.1 & wins on modularity and warranty.
The Thermaltake Smart BM3 offers higher wattage and advanced features, making it a better choice for high-performance systems, while the Corsair CX550 is a more budget-friendly option.
Why CORSAIR CX550 80 Plus Bronze Non Modular Low-Noise ATX is better
Price
Corsair CX550 is $10 cheaper
Size
Corsair is more compact at 125mm
Warranty
Corsair has a decent three-year warranty
Why Thermaltake Smart BM3 750W 80Plus Bronze ATX 3.1 & is better
Power
Thermaltake offers 750W compared to 550W
Features
Thermaltake includes PCIe Gen 5 support
Durability
Thermaltake uses high-quality Japanese capacitors
Overall score
Specifications
| Spec | CORSAIR CX550 80 Plus Bronze Non Modular Low-Noise ATX | Thermaltake Smart BM3 750W 80Plus Bronze ATX 3.1 & |
|---|---|---|
| Power Output | 550W | 750W |
| Efficiency | 80 PLUS Bronze | 80 PLUS Bronze |
| Cooling Type | Low-noise fan | Smart Zero Fan |
| Capacitor | Standard | Japanese 105°C |
| Modularity | Non-modular | Semi-modular |
Dimension comparison
Overview of the Products
The CORSAIR CX550 and the Thermaltake Smart BM3 750W are both reputable power supplies, but they cater to different needs. The CORSAIR CX550 is priced at $65.99, while the Thermaltake Smart BM3 is available for $75.99, making the CORSAIR about 17% cheaper. Each power supply offers distinct features that appeal to various users, from casual builders to those looking to support high-performance components.
Power Output and Efficiency
The CORSAIR CX550 delivers 550 watts of power, while the Thermaltake Smart BM3 provides a higher output of 750 watts. This 200-watt difference makes the Thermaltake better suited for systems with high-performance graphics cards and extensive hardware setups. Both power supplies boast an 80 PLUS Bronze certification, ensuring efficient operation with up to 88% efficiency. However, if you plan on using high-demand components, the higher wattage of the Thermaltake is a significant advantage.
Cooling Solutions
Cooling is essential for maintaining system performance and longevity. The CORSAIR CX550 features a 120mm thermally controlled low-noise cooling fan that adjusts its speed based on the load, ensuring quieter operation during low-use situations. On the other hand, the Thermaltake Smart BM3 also includes a 120mm fluid dynamic bearing fan equipped with a Smart Zero Fan function, which prevents the fan from spinning until the load exceeds 20%. This feature allows for minimal noise during low power draws, appealing to users who prioritize a quiet PC.
Design and Compatibility
In terms of design, the CORSAIR CX550 has a compact casing measuring 125mm, making it easy to fit into most modern PC cases. Its black sleeved cables and powder-coated casing ensure a seamless integration with various setups. Conversely, the Thermaltake Smart BM3, with a slightly larger size of 150mm in width, is still designed to fit in most cases but may require more space. It is fully compatible with Intel ATX 3.1 standards and includes a PCIe Gen 5 connector, making it a future-proof option for users who plan on upgrading their systems.
Durability and Warranty
Durability is a crucial factor when choosing a power supply. The CORSAIR CX550 comes with a three-year warranty, providing users with peace of mind. The Thermaltake Smart BM3 offers a more extended five-year warranty, which indicates a higher confidence in its longevity and reliability. Additionally, the Thermaltake utilizes high-quality Japanese capacitors rated for 105°C, which enhances its durability even further, especially under high loads.
User Experience and Noise Levels
User experience often hinges on noise levels and operational efficiency. The CORSAIR CX550 is designed for low-noise operation, with its fan only ramping up under heavy load. The Thermaltake Smart BM3’s Smart Zero Fan feature enhances this by preventing the fan from spinning at low loads, making it an excellent choice for those sensitive to noise. Both power supplies are engineered to provide a quiet computing experience, but the Thermaltake may edge out slightly with its advanced fan management.
Price Comparison
The pricing difference between these two power supplies could influence your decision significantly. The CORSAIR CX550 is currently available for $65.99, while the Thermaltake Smart BM3 retails for $75.99. This means that the CORSAIR is about $10 cheaper, making it a more budget-friendly option for users who do not require the higher wattage or additional features offered by the Thermaltake. However, the extra cost of the Thermaltake may be justified for users needing its enhanced features and higher output.
Which should you buy?
Choosing between the CORSAIR CX550 and the Thermaltake Smart BM3 ultimately depends on your specific needs. If you're looking for a reliable, cost-effective option for a standard gaming or office PC, the CORSAIR CX550 at $65.99 could be the ideal choice. However, if you require higher wattage for extensive setups or want additional features like PCIe Gen 5 support and a longer warranty, the Thermaltake Smart BM3 at $75.99 offers compelling advantages. Assess your system requirements carefully to make the best decision for your build.