High tech scam

Instead of fake frames, he got fake cards:

A Chinese hardware repair YouTuber received four allegedly faulty RTX 4090 graphics cards that needed repairing. The YouTuber discovered that three of the four cards were fake graphics cards modded from RTX 3090s and RTX 3080s to look like the real deal. The three fake cards had to be scrapped since they were apparently incapable of running. The customer of the four GPUs apparently paid $1,394 (10,000 yuan) for each GPU and purchased all four from an overseas vendor or supplier.

So, he paid $5,600 for one 4090. Ouch! He could've bought a 5090 for under $3,000!

It's just not worth the headache to buy expensive GPUs online.