CORSAIR HX1500i Fully Modular Ultra-Low Noise ATX vs Thermaltake Smart BM3 750W 80Plus Bronze ATX 3.1 &
Updated August 2026 — CORSAIR HX1500i Fully Modular Ultra-Low Noise ATX leads on modularity and noise level.
The CORSAIR HX1500i offers superior efficiency and features, making it the better choice for high-performance builds, while the Thermaltake Smart BM3 is a budget-friendly option.
Why CORSAIR HX1500i Fully Modular Ultra-Low Noise ATX is better
Efficiency
HX1500i has 80 PLUS Platinum certification.
Modularity
HX1500i is fully modular.
Warranty
HX1500i offers a ten-year warranty.
Why Thermaltake Smart BM3 750W 80Plus Bronze ATX 3.1 & is better
Price
Smart BM3 is significantly cheaper.
Basic Features
Smart BM3 meets essential ATX 3.1 standards.
Compact Size
Smart BM3 is suitable for budget builds.
Overall score
Specifications
| Spec | CORSAIR HX1500i Fully Modular Ultra-Low Noise ATX | Thermaltake Smart BM3 750W 80Plus Bronze ATX 3.1 & |
|---|---|---|
| Certification | 80 PLUS Platinum | 80 PLUS Bronze |
| Modularity | Fully Modular | Semi-Modular |
| Fan Type | FDB | FDB |
| Warranty | 10 Years | 5 Years |
| Cooling Mode | Zero RPM | Smart Zero Fan |
Dimension comparison
Price Comparison
The CORSAIR HX1500i is significantly more expensive than the Thermaltake Smart BM3, priced at $349.99 compared to $75.99 for the latter. This represents a price difference of about 78% in favor of the Smart BM3, making it a more budget-friendly option. While the higher cost of the HX1500i can be justified by its advanced features and efficiency ratings, the Thermaltake offers essential capabilities at a fraction of the cost, appealing to value-oriented users.
Performance and Efficiency
When it comes to performance, the CORSAIR HX1500i boasts an impressive 80 PLUS Platinum efficiency rating, which is higher than the Smart BM3’s 80 PLUS Bronze certification. This difference translates to lower energy consumption and reduced electricity bills over time. The HX1500i is designed to handle transient power spikes and supports the latest PCIe Gen 5 platform, making it ideal for high-performance builds. In contrast, while the Smart BM3 is competent for most users, its Bronze certification may not provide the same level of efficiency, especially under heavy loads.
Modularity
The CORSAIR HX1500i features fully modular cabling, allowing users to connect only the cables they need for their builds, resulting in a clean and organized setup. This is particularly beneficial for custom builds where airflow and aesthetics are important. The Thermaltake Smart BM3, on the other hand, is semi-modular, which means some cables are permanently attached. This could lead to a cluttered appearance if not managed properly, especially in larger cases.
Cooling Solutions
Cooling is a critical aspect of power supply performance, and both units employ fluid dynamic bearing fans for efficient heat management. The HX1500i uses a 140mm fan with a Zero RPM mode, allowing it to operate silently at low to medium loads. In comparison, the Smart BM3 has a 120mm fan equipped with a Smart Zero Fan function that prevents the fan from spinning until the load exceeds 20%. While both designs aim for quiet operation, the HX1500i's larger fan may provide superior cooling under demanding conditions.
Warranty and Reliability
The CORSAIR HX1500i comes with a ten-year warranty, indicating the manufacturer’s confidence in its durability and reliability. This long warranty period is a significant advantage for users looking for a long-term investment. The Thermaltake Smart BM3, while still respectable, offers a standard five-year warranty. This difference may influence buyers who prioritize longevity and reliability in their power supply units.
Compatibility and Future-Proofing
In terms of compatibility, both the CORSAIR HX1500i and the Thermaltake Smart BM3 are certified to meet Intel's ATX 3.1 standards and support PCIe Gen 5, which is essential for modern graphics cards and hardware. However, the HX1500i’s ATX 3.1 certification and superior efficiency make it a more future-proof choice for users planning to upgrade their systems over time. The Smart BM3 is suitable for current builds but may not offer the same level of assurance for future advancements in power requirements.
User Experience and Features
The CORSAIR HX1500i provides a comprehensive user experience through its CORSAIR iCUE software, allowing for customized fan curves and real-time power monitoring. This feature is particularly beneficial for enthusiasts who want to fine-tune their system's performance. The Thermaltake Smart BM3, while lacking such advanced software integration, does include essential features like built-in industrial-grade protection and high-quality Japanese capacitors, ensuring a reliable user experience for everyday tasks.
Which should you buy?
Choosing between the CORSAIR HX1500i and the Thermaltake Smart BM3 ultimately depends on your needs and budget. If you require a high-performance, efficient power supply with advanced features and long-term reliability, the HX1500i is worth the investment at $349.99. However, if you are looking for a cost-effective option that still meets modern standards, the Smart BM3 at $75.99 offers solid performance without breaking the bank. Consider your current and future hardware needs to make the best choice for your system.

