Thermalright TR-KG750: Budget ATX 3.1 Power on Paper
Thermalright, a brand more commonly associated with CPU coolers and PC cases, has entered the power supply market with the TR-KG750. This 750W unit promises ATX 3.1 compliance, a native 12V-2x6 connector, and a five-year warranty, all for a compelling price of $91. On the surface, it appears to be a strong contender for budget-conscious builders seeking modern features. However, a closer inspection reveals that this affordability comes at a cost, primarily visible in its internal design and component choices, which are a significant departure from what one might expect from a reputable PSU manufacturer.
The TR-KG750 is built by HKC, a manufacturer that has produced PSUs for various brands. While HKC has a history in the market, their units often occupy the lower end of the performance spectrum. This review will delve into the actual performance of the TR-KG750, examining its electrical characteristics, thermal performance, and build quality to determine if it's a viable option for modern PC builds despite its budget positioning.
Internal Design and Component Choices
The most telling aspect of the TR-KG750's budget-oriented nature is its internal construction. Upon opening the unit, it becomes clear that compromises have been made to achieve the low price point. The primary capacitor, a critical component for voltage regulation and ripple suppression, is sourced from CapXon, a brand generally considered to be of lower quality compared to Japanese manufacturers like Nippon Chemi-Con or Nichicon, which are standard in higher-tier PSUs. While CapXon capacitors can perform adequately, their long-term reliability and performance under stress are often inferior.
Further examination reveals other cost-saving measures. The unit employs a half-bridge LLC resonant converter topology, which is a common and effective design for PSUs in this wattage class. However, the implementation appears basic, with less robust filtering and voltage regulation circuitry than typically found in more premium units. The use of smaller heatsinks and fewer protective components also suggests a design focused on meeting baseline specifications rather than exceeding them or offering significant headroom for demanding loads or extended operation.
Electrical Performance: Voltage Regulation and Ripple Suppression
During testing, the TR-KG750 demonstrated adequate voltage regulation, meaning the output voltages stayed within the acceptable ATX tolerances. The 12V rail, crucial for powering the CPU and GPU, remained stable under various load conditions. Cross-load testing showed that the voltage regulation remained within the +/- 5% limits required by ATX standards.
Ripple suppression, however, is an area where the TR-KG750 shows its limitations. Ripple refers to the small AC fluctuations that remain on the DC output after rectification and filtering. Excessive ripple can stress components and potentially reduce their lifespan. While the TR-KG750's ripple levels were within ATX specifications during most tests, they were noticeably higher than those seen in higher-quality power supplies. Under peak loads, the ripple on the 12V rail approached the upper limits of acceptable values. This suggests that the filtering circuitry is less effective, a direct consequence of the cost-saving component choices.
ATX 3.1 and 12V-2x6 Connector Functionality
The inclusion of ATX 3.1 compliance and a native 12V-2x6 connector is a significant selling point for the TR-KG750, especially at its price. ATX 3.1 is the latest revision of the ATX standard, designed to better handle the transient power spikes of modern high-end GPUs. The 12V-2x6 connector, a more robust successor to the 12VHPWR, is intended to provide a more secure and reliable connection for power-hungry graphics cards.
In practice, the TR-KG750 does deliver on this promise. The PSU was able to handle the transient spikes from a high-end GPU during testing, indicating that the ATX 3.1 features are functional. The native 12V-2x6 connector also provides a clean and direct power delivery solution, avoiding the need for potentially problematic adapters that came with earlier versions of the standard. For builders focused on future-proofing or those upgrading to the latest generation of GPUs, these features are undeniably attractive.
Thermal Performance and Acoustics
The TR-KG750 employs a 120mm fan for cooling. Under light to moderate loads, the fan operates at a low speed, keeping noise levels to a minimum. This is a common feature in modern PSUs, often marketed as a semi-passive or zero-RPM mode. However, as the load increases, the fan speed ramps up noticeably. While the noise levels do not become excessively intrusive, they are more audible than in many higher-quality PSUs that use larger fans or more sophisticated fan curves to maintain quieter operation across a wider load range.
The thermal performance of the unit itself appears adequate for its rated wattage, thanks to the compromises in component selection and the basic design. The heatsinks, while smaller than ideal, are sufficient to dissipate the heat generated under typical operating conditions for a 750W unit. However, sustained operation at or near maximum load, especially in a poorly ventilated case, could push the thermal limits of the components, potentially impacting long-term reliability.
Warranty and Overall Value Proposition
Thermalright backs the TR-KG750 with a five-year warranty. This is a respectable warranty period, particularly for a PSU in this price bracket. It suggests that Thermalright has some confidence in the product's longevity, or at least that the warranty serves as a significant market differentiator. However, it's important to balance this against the internal compromises. A longer warranty can help mitigate concerns about the lower-quality components, but it doesn't fundamentally improve the electrical performance or the inherent limitations of the design.
The core value proposition of the TR-KG750 lies in its price and feature set. For $91, obtaining a 750W ATX 3.1 PSU with a native 12V-2x6 connector is difficult to find elsewhere. This makes it an appealing option for builders on a strict budget who prioritize these modern standards. However, users who prioritize absolute stability, lower ripple, and the highest quality components might need to look at more expensive options. The question for consumers becomes: are the ATX 3.1 features and the low price worth the compromises in internal build quality and potentially long-term reliability?