Also, as the chip and board here seems like an A100 reference design, using an A100 VBIOS image shouldn't fail any signature checks.
The lack of memory would be the most obvious difference. The A100 has 80GB, this has 8GB.
And I really suspect Nvidia probably some way of explicitly locking a chip to a given product ID, like efuses that the BIOS firmware can check on boot.
More sensible way to stopping that would be writing eeprom with encrypted key burned into the GPU itself but I doubt NVIDIA bothered, money loss for few people willing enough to take their GPU apart to replace a chip is insignificiant.