NVIDIA's GeForce RTX 4090 D GPU was launched late last year in China—this weakened variant (of the standard RTX 4090 ) was designed with US trade regulations in mind. Chinese media outlets have toyed around with various custom models for several months—January 2024 evaluations indicated a 5% performance disadvantage when lined up against unrestricted models. The GeForce RTX 4090 D GPU is a potent beast despite a reduced core count and restricted TDP limit, but Chinese enthusiasts have continued to struggle with the implementation of worthwhile overclocks . HKEPC—a Hong Kong-situated PC hardware review outlet—has bucked that trend.

The mega-sized flagship ZOTAC RTX 4090 D PGF model has the technical credentials to break beyond the expected overclock increase of "2 to 5%," courtesy of a powerful 28-phase power PCB design and 530 W max. TGP limit. The Expreview team pulled a paltry 3.7% extra bit of performance from ZOTAC China's behemoth. In contrast, HKEPC wrangled out some bigger numbers with a sampled ASUS ROG STRIX RTX 4090 GAMING OC graphics card—matching unrestricted variants: "it turns out that NVIDIA only does not allow AIC manufacturers to preset overclocking, but it does not restrict users from overclocking by themselves. After a high degree of overclocking adjustment, the ROG Strix RTX 4090 D actually has a way to achieve the performance level of the RTX 4090 FE."