China’s secondhand GPU market has produced a new kind of GeForce RTX 4090 scam: fake cards that no longer bother with a rebadged RTX 3080 or RTX 3090 chip, but instead hide a plastic imitation of the GPU die itself. That is a remarkably low-effort upgrade in fraud, and a depressing one for anyone hunting a bargain RTX 4090 that looks too cheap to be real.
The fake card was shown by the Chinese repair channel Brother Zhang after it bought a broken RTX 4090 for 1,500 yuan, about $220. For a flagship card that sold into a market already flooded with expensive used hardware, that price alone should set off alarms. This time, though, the scam was more elaborate than a simple swapped chip.
How the fake RTX 4090 was built
At first glance, the board tried to pass as an Nvidia AD102-300-A1 with TW304E2 markings. The problem was that the date code ”30” pointed to a chip made in 2030, which is not exactly compatible with a card already on the market. The GPU substrate was also missing the expected QR code in the lower-left corner, and the surrounding SMD parts did not match the layout of a real RTX 4090.
Closer inspection showed the center of the GPU die was not silicon at all, but plastic with fake printing on top. The GDDR6X memory chips were fake too, added mainly to make the board look complete. In other words, the card was built to survive a quick glance and little else.
Used RTX 4090 scams keep getting more brazen
This is not the first time RTX 4090 buyers have been burned on the used market. Earlier scams involved cards sold with no GPU installed at all, or boards fitted with laser-relabeled chips from the GeForce RTX 3080, RTX 3080 Ti, or RTX 3090. The new twist is the sheer audacity of replacing the processor with a plastic stand-in and still expecting the board to fool anyone beyond the most casual inspection.
The pattern is familiar: premium hardware attracts premium-grade fraud. Nvidia’s flagship cards command enough money that counterfeiters can keep refining their tricks, and the secondary market keeps giving them fresh victims. Expect more teardown videos before the scam gets any harder to spot.