bom

Start from the power envelope, because it decides the GPU count more often than the budget does. The scalable unit that makes the design a copy of a known-good one, the four networks, and the three line items that gate the schedule while everyone is discussing GPUs.

The count follows from three inputs and one topology rule, and getting it wrong by the leaf-to-spine half is the classic error. The arithmetic, the radix check that says two tiers is enough, and the power the transceivers add that nobody put in the budget.