I can't speak to modern hpc, since I've been out of the game for a few years but icc was absolutely the preferred compiler for almost any workload and Intel pro

I can't speak to modern hpc, since I've been out of the game for a few years but icc was absolutely the preferred compiler for almost any workload and Intel procs were the desired hardware to run on. AMD was joked about as the only reason Intel wasn't considered a monopoly at the time and that Intel would happily take wheelbarrows of cash over to AMD to prop them up, just to ensure they didn't even appear like a monopoly. But no one in the field was buying AMD procs for their workloads.