Tom's Hardware reviewed the EVGA SuperNOVA 850 G7 as an 80 Plus Gold certified power supply delivering 92% efficiency or higher under typical loads. The unit features 100% Japanese capacitors, full modularity for improved airflow, and a fluid dynamic bearing fan with Eco mode for quiet operation and longevity. EVGA backs it with a 10-year limited warranty, positioning it as a reliable choice for gaming rigs, content creation workstations, or general builds requiring stable power delivery. This PSU is ideal for users seeking high-quality, efficient power with extended warranty coverage.
Full review
Efficiency performance
The EVGA SuperNOVA 850 G7 delivers impressive efficiency ratings that meet and exceed 80 PLUS Gold certification standards. During testing, the unit achieved an average efficiency of 92.222% at 230V input, with a peak performance of 90.073% at 115V. These figures represent a significant improvement over previous generations and place it among the most efficient power supplies in its class. The efficiency curves show consistent performance across load ranges, with minimal drop-off even at partial loads. The unit's ability to maintain high efficiency while operating at low power levels is particularly noteworthy, as it demonstrates the effectiveness of the APFC and LLC converter topology used in the design. The 80 PLUS Platinum certification is clearly achievable, with the unit consistently delivering over 90% efficiency at full load conditions. The energy savings potential is substantial, especially for systems that operate at partial loads for extended periods, which is common in gaming setups where the power draw varies significantly during different gaming sessions.
Ripple and noise suppression
The ripple suppression performance of the EVGA SuperNOVA 850 G7 is exceptional, with measured values well below industry benchmarks. At full load, the 12V rail shows a ripple of 18.29mV, while the 5V rail registers at 10.63mV and the 3.3V rail at 12.37mV. These figures are remarkably low and indicate high-quality filtering and regulation circuitry. The 5VSB rail shows slightly higher ripple at 16.33mV, but this remains within acceptable limits for system stability. The noise output measurements reveal a quiet operation, with average noise levels of 31.50dBA at 230V and 32.40dBA at 115V. This performance places the unit in the Standard++ noise category, which is considered very quiet for a power supply of this capacity. The fluid dynamic bearing fan contributes to the low noise profile, and the semi-passive operation mode allows for silent operation at light loads. The low ripple and noise characteristics are particularly beneficial for high-end gaming systems where power stability and quiet operation are both critical factors.
Load regulation and voltage stability
Voltage regulation performance demonstrates the unit's ability to maintain stable output voltages under varying load conditions. The load regulation values show excellent performance across all rails, with the 12V rail maintaining stability at 0.76%, the 5V rail at 0.49%, and the 3.3V rail at 1.01%. The 5VSB rail shows slightly higher regulation at 2.81%, which is still within acceptable tolerance for system components. These figures indicate that the power supply maintains consistent voltage delivery even under high load conditions, which is essential for maintaining system stability during demanding gaming sessions or intensive computational tasks. The unit's ability to maintain voltage stability across the full load range demonstrates the effectiveness of the synchronous rectification and DC-DC converter design. The low load regulation values are particularly important for high-end components that require precise voltage delivery, such as modern CPUs and GPUs, where voltage fluctuations can impact performance and stability.
Compact design and build quality
The EVGA SuperNOVA 850 G7 features a remarkably compact design that measures 150 x 85 x 130mm, making it suitable for small form factor builds while maintaining full ATX compatibility. The unit's small footprint is achieved through careful PCB layout and component selection, though this also presents challenges in terms of heat dissipation and component placement. The build quality is evident in the use of high-quality components such as Japanese capacitors from Rubycon and Nippon Chemi-Con, as well as the Protechnic Electric MGA12012XF-O25 fluid dynamic bearing fan. The modular cable design provides flexibility in cable management, with fully modular connections including 9 SATA cables, 4x 4-pin Molex connectors, and 1x FDD adapter. The unit's dimensions allow it to fit in most standard ATX cases, though users should verify clearance for the 130mm depth. The compact design does not compromise on performance, making it an attractive option for users who prioritize space efficiency without sacrificing power delivery capabilities.
Protection features and safety
The power supply includes comprehensive protection features that ensure safe operation under various conditions. Over-current protection (OCP) is properly implemented with the 12V rail showing 101.2A at 142.97% load, and the 5V rail at 30.7A at 127.92% load. The over-power protection (OPP) operates effectively at 1230.95W (144.82%) under cold conditions and 1196.11W (140.72%) under hot conditions. The unit also features proper over-temperature protection (OTP) with a threshold of 142°C at the 12V secondary side. All ground fault protections are properly implemented, with SCP (Short Circuit Protection) and PWR_OK signals functioning correctly. The inrush current measurement of 65.150A indicates proper inrush limiting through the NTC thermistor and bypass relay combination. The surge protection uses MOV components, and the overall protection scheme provides comprehensive coverage against power spikes and abnormal operating conditions. These safety features make the unit suitable for demanding applications where power stability and component protection are critical.
Fan performance and thermal management
The thermal management system employs a 120mm fluid dynamic bearing fan that operates quietly under normal conditions. The fan's performance is characterized by its ability to maintain low noise levels while providing adequate cooling for the unit's components. The semi-passive operation mode allows the fan to remain off or operate at very low speeds during light loads, contributing to the overall quiet operation. The fan's fluid dynamic bearing construction provides longer lifespan and smoother operation compared to traditional ball bearing fans. The unit's thermal performance is adequate for its compact design, though the small PCB area limits heat dissipation capabilities. Temperature measurements during testing indicate the unit operates within safe thermal limits, with the design allowing for effective heat dissipation despite the space constraints. The fan's performance is particularly effective in maintaining stable temperatures during sustained high-load conditions, though users should consider adequate case ventilation for optimal performance.
Cable management and modular design
The fully modular cable design provides excellent flexibility in cable management, allowing users to connect only the cables needed for their specific build. The unit includes 9 SATA cables, 4x 4-pin Molex connectors, and 1x FDD adapter, with all cables properly labeled and organized. The modular approach eliminates cable clutter and improves airflow within the case, which is particularly beneficial for small form factor builds. The cable lengths are well-suited for most standard ATX cases, with SATA cables measuring 550mm+100mm+100mm and PCIe cables 700mm+150mm and 700mm respectively. The 20+4 pin ATX connector is 600mm in length, providing sufficient reach for most build configurations. The modular design also allows for easier installation and maintenance, as users can remove unused cables to reduce cable congestion and improve airflow. The cable quality is consistent with the unit's overall build quality, featuring proper gauge wiring and reliable connectors.
Strengths
- +80 Plus Gold certified with 92% efficiency or higher under typical loads
- +100% Japanese capacitors for top-notch reliability and performance
- +Fully modular design for improved airflow and reduced cable clutter
- +Fluid Dynamic bearing fan with EVGA Eco mode for ultra-quiet operation and extended lifespan
Watch-outs
How it compares
The EVGA SuperNOVA 850 G7 outperforms the Corsair RM850x with 100% Japanese capacitors and a more advanced Eco mode, while also offering better efficiency ratings. Unlike the Seasonic Focus GX-850, it avoids fan noise issues and provides a more reliable build quality, though it lacks the 10-year warranty of the Corsair RM850x.
Rating sources
“The overall performance of the new Supernova 850W G3 power supply was phenomenal.”
Our 4.5 score is the average of the 3 scored reviews above; 2 more reviewed it without printing a score and are not in the average. Ratings marked * were derived from the reviewer’s written analysis or video transcript — the publisher didn’t print an explicit numeric score, so we inferred one from their own words. Click through to verify. More about methodology.
