CORSAIR RM750e ATX 3.1 PCIe 5.1 Ready Fully Modular 750W Power Supply – 12V-2x6 Cable Included, Cybenetics Gold Efficiency, 105°C-Rated Capacitors, Modern Standby Mode – Black vs Thermaltake Smart 500W 80+ White Certified PSU, Continuous Power with 120mm Ultra Quiet Cooling Fan, ATX 12V V2.3/EPS 12V Active PFC Power Supply PS-SPD-0500NPCWUS-W

Power Output and Efficiency: Performance at a Glance

The CORSAIR RM750e delivers 750W of power, significantly exceeding the Thermaltake Smart’s 500W continuous output. This difference means the RM750e can support more demanding systems, including high-end GPUs and multi-core CPUs, while the Smart remains suited for mid-range builds. In efficiency, the RM750e boasts Cybenetics Gold certification, indicating superior performance under load, whereas the Smart is rated 80 PLUS White—lower than Gold but still compliant with basic energy standards. The RM750e’s higher wattage and advanced certification make it better equipped for future-proofing and sustained performance.

Build Quality and Component Standards

The CORSAIR RM750e features 105°C-rated capacitors, which are designed to withstand higher temperatures and improve long-term reliability. This industrial-grade component choice supports stable voltage delivery even under heavy loads. In contrast, the Thermaltake Smart uses high-quality components but does not specify capacitor temperature ratings. While both PSUs include protections like over-voltage and short-circuit protection, the RM750e’s inclusion of Intel ATX 3.1 and PCIe 5.1 readiness indicates compliance with modern power standards, offering enhanced stability for next-generation hardware. The Smart adheres to older ATX 12V V2.3 and EPS 12V 2.92 standards, limiting its compatibility with newer platforms.

Cable Management and Modularity

The CORSAIR RM750e is fully modular, meaning users only connect the cables they need, reducing cable clutter and improving airflow inside the case. It includes a 12V-2x6 cable and multiple PCIe connectors, supporting modern GPU configurations. The Thermaltake Smart, however, is non-modular—cables are permanently attached—requiring users to manage all cables regardless of system needs. This lack of modularity can hinder airflow and complicate builds, especially in compact cases. The RM750e’s modular design offers greater flexibility and cleaner internal routing, making it ideal for custom or high-performance builds.

Noise and Cooling Performance

Both PSUs feature 120mm fans, but their cooling strategies differ. The RM750e uses a rifle-bearing fan with a specially calculated fan curve that minimizes noise even at full load. This ensures quiet operation during intensive tasks. The Thermaltake Smart also uses a 120mm fan, described as delivering “excellent airflow at an exceptionally low noise level,” though it lacks details on fan curve optimization. While both aim for quiet performance, the RM750e’s fan control is explicitly tuned for low noise under load, giving it a slight edge in real-world use. The Smart’s fan operates at 1800 RPM, which may contribute to audible noise during peak usage.

Compatibility and Future-Proofing

The CORSAIR RM750e is ATX 3.1 certified and PCIe 5.1 ready, supporting transient power excursions from modern GPUs and ensuring compatibility with upcoming hardware. It includes a native 12V-2x6 connector and dual PCIe 8-pin connectors, directly addressing current and future GPU power demands. The Thermaltake Smart lacks these certifications and does not mention PCIe 5.1 support. Its two 6+2-pin PCIe connectors are standard for older GPUs but may not suffice for next-gen cards requiring higher power delivery. For users planning upgrades, the RM750e offers clear future-proofing advantages.

Warranty and Longevity

The CORSAIR RM750e comes with a seven-year warranty, reflecting Corsair’s confidence in its build quality and long-term reliability. This extended coverage is rare among budget PSUs and provides peace of mind for users investing in high-performance systems. The Thermaltake Smart offers a five-year warranty, which is solid but shorter by two years. Both units list MTBF (Mean Time Between Failures) of 100,000 hours, suggesting similar expected lifespans under normal conditions. However, the RM750e’s longer warranty aligns with its premium positioning and higher price point.

Price and Value Comparison

The CORSAIR RM750e is priced at $89.99, nearly double the Thermaltake Smart’s $39.99. This represents a $50.00 price difference, or about 56% more expensive. While the RM750e offers higher wattage, gold efficiency, full modularity, and modern certifications, the Smart provides essential functionality at a fraction of the cost. For budget-conscious buyers building a mid-tier system, the Smart delivers value with reliable performance. However, those seeking longevity, efficiency, and compatibility with cutting-edge hardware will find the RM750e’s premium pricing justified by its advanced features and robust specifications.

Which should you buy?

Choose the CORSAIR RM750e if you need a high-wattage, future-ready PSU with gold efficiency, full modularity, and a seven-year warranty—ideal for gaming rigs or workstations with powerful GPUs. It’s $50.00 more than the Thermaltake Smart but offers significant advantages in performance, compatibility, and durability. Opt for the Thermaltake Smart only if you’re building a budget-friendly system with modest power needs, where a 500W output and 80 PLUS White efficiency are sufficient. At $39.99, it’s about 56% cheaper than the RM750e, making it a practical entry-level option—but not a match for modern high-performance setups.