The Toughpower GF1 1000W doesn't impress us, although it uses a reliable and high-build quality CWT platform. Except for load regulation and ripple suppression, it needs work in all other major performance sections to stand a chance against Corsair, Seasonic, and EVGA competition. Its platform uses a modern design but needs tuning to offer a tighter transient response, especially at 12V. It also needs higher efficiency and better PF readings.
The competition uses upgraded platforms in this load range, and Thermaltake has to keep up, creating custom designs instead of selecting among the existing ones. Corsair, for example, created its own platform for the new RMx, and EVGA modified the Seasonic Focus Gold platform for its G6 models. This is the only way to stand out from the crowd and achieve the highest possible performance, which will provide the edge over the competition.
The GF1 models from 750W to 1000W are based on CWT's GPR platform, which needs an update to meet today's demanding users and effectively meet other designs. The flagship GF1 model with 1200W max power uses a more advanced platform from CWT, called CST, which offers more performance and costs. If you can afford the price difference between the GF1 1000W and 1200W, around 40 dollars, the latter offers more than 4% better performance, increased capacity, and higher efficiency. If you don't want to go above 1000W, the Corsair RM1000x (2021) and the EVGA SuperNOVA 1000 G6 are among the best choices in this category.
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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.