> removing cores for sanction busting AI cards, reassembling the now worthless PCB with the cooler and scamming some unsuspecting customer that thinks they are getting a deal
I'm either particularly ignorant or this claim has some inconsistencies. My understanding is that you cannot "remove cores" from a GPU. The titular RTX 4090 (Ada Lovelace) comes with 16,384 CUDA Cores. At face value, it sounds like you're saying that Brother Zhang's repair shop uses some nano-technology tools to open up the Ada silicon itself and then somehow disable or destroy or dissect the silicon to reduce the core count. And then they sell these reduced core counts GPUs (???).
That's obviously preposterous, but I'm having trouble steelmanning this to re-construct your actual meaning.
remove cores = remove the GPU die
So far, everyone's concepts have felt pretty half-baked. Perhaps someone could point me to some actual reports relating to this topic which go into real detail about allegations around how these repair shops contribute to fraud. I'm not having a lot of luck engaging here, but maybe I'm just a bit dim-witted.
> In that case, why would the scammer sell the 4090 board at all? At that level of fraud, the scammer could just as well send a circuit board from an alarm clock, or a brick.
Plausible deniability. With a real-looking GPU, the seller can always fall back on user error, bad PSU, driver issue, PCIe slot problem etc.
The buyer may even doubt themselves at first and spend time reseating the card, reinstalling drivers, swapping cables, or testing another system. By the time they're confident it's not their fault, the return window or dispute period may already be gone.
None of that works if you send a brick or an alarm clock PCB - the fraud is immediately obvious.