The Toughpower Grand RGB 850W Platinum is another good power supply from Thermaltake. Besides 80 PLUS Platinum efficiency, it also achieves ETA-A and LAMBDA-S++ efficiency and noise ratings, in the Cybenetics scale. While its overall noise output is not high, it could be even quieter still if the fan didn't spin, for short intervals thankfully, at full speed under light loads, once the passive operation ends. With a better fan speed profile, the TPG-0850F1FAP would be closer to its close competitors, the Seasonic Focus Plus Platinum with similar capacity and the Corsair HX850.
Channel Well Technology, the original manufacturer of this power supply, used a semi-digital platform with good build quality and components that will last through time. The majority of electrolytic capacitors belong to good Japanese lines, and the cooling fan uses a hydrodynamic bearing, so it will easily live through the ten-year warranty if you don't expose it to very high operating temperatures (>40 degrees Celsius) frequently and for prolonged periods.
The TPG-0850F1FAP scores high performance in almost all areas but the transient response at 3.3V, where it failed in one of our tests. This rail is not significant since it is only lightly used in today's systems, but still, it has to meet the ATX spec's requirements and keep its voltage in control in any case. Another issue is the absent, or not properly configured, over-temperature protection. Thermaltake should look in this and take action the sooner the possible since OTP is among the most crucial protection features in PSUs.
The TPG-0850F1FAP scores higher in overall performance than its Seasonic and Corsair rivals and has RGB lighting. It is not as quiet, though, and this is something that Thermaltake should improve in a future version of this product, along with the over-temperature protection.
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Disclaimer: Aris Mpitziopoulos is Tom's Hardware's PSU reviewer. He is also the Chief Testing Engineer of Cybenetics and developed the Cybenetics certification methodologies apart from his role on Tom's Hardware. Neither Tom's Hardware nor its parent company, Future PLC, are financially involved with Cybenetics. Aris does not perform the actual certifications for Cybenetics.