The Thermaltake Toughpower GF1 850W achieves good performance in all major segments: load regulation, ripple suppression, efficiency, and transient response. Moreover, it has a long enough hold-up time, its protection features are properly configured, and the overall noise output doesn't exceed 30 dB(A) under realistic temperature conditions (30-32 degrees Celsius).
The compact dimensions, along with the high build quality and the HDB fan, are included in the Pros list, and the same goes, of course, for the fully modular cables that don't use in-line caps.
With a pair of EPS connectors and six PCIe ones, the GF1 850W can easily deliver full power without significant voltage drops. I also appreciate the long distance between the peripheral connectors, especially the ones that host 4-pin Molex connectors, since usually the parts that use them (e.g., case fans) are installed quite far from each other. Finally, the selectable semi-passive fan operation means that you can install this unit with its fan grille facing downwards, without worrying about increased temperatures at its internals, given that you can deactivate the passive operation.
Because of the US tariffs this product is not widely available in the US market, including Thermaltake's ttpremium store, while competing offerings like the Corsair RM850x and the similar capacity Seasonic Focus Plus Gold can be easily found in online stores. Thermaltake should look into this unit’s availability in the US market and offer an additional and good option to users that need a 850W PSU with high build quality and good overall performance.
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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.