This question appears to be about building a mining rig and installing a bunch of GPU cards. Something goes wrong, and the OP has a question.
Arguments for on-topic:
- Installing a bunch of GPUs is something that ordinary users are unlikely to do (but there are certainly other computing activities that might need multiple GPUs)
- The user's purpose for doing this is clearly to build a mining rig, something that other site users are likely to have done
Arguments for off-topic:
- None of the immediate content of the question has anything to do with Bitcoin (or other cryptocurrency)
- Superuser is a well-established site where hardware questions like this are specifically on-topic
I suggest that if a consensus is reached on this point (or generally on hardware-specific questions), that the decision is added to the on-topic help center page (in whichever section is decided). Right now there is no guidance for topicality of purely hardware/OS questions.