GPU-Z Can Tell You Now If The Nvidia Graphics Card You Bought Is A Fake
"We worked extensively on the ability of GPU-Z to detect fake Nvidia graphics cards (i.e cards not really having the GPU advertised on the box). GPU-Z now prepends '[FAKE]' to the Graphics Card name field, and lights up with a caution triangle. This capability is forward compatible for the supported GPUs (listed in the changelog), so for example, it will be able to detect a fake RTX 2060, which in reality uses a GK106 GPU," TechPowerUp explains.
This feature was added to GPU-Z version 2.12.0 released on Friday. There's actually a newer build released today, version 2.13.0, that contains the same feature update plus a handful of bug fixes. You can grab it here.