This also fixes the instances in testing where we don't have the nv overclock in use, but we do have the mode set
Solves issues explaining the what the perf_level actually meant, and future proofs for any PR that wants to set individual perf levels
This covers the MVP for now, and simply allows pinning the power level to "high"
Full overclocking set up is somewhat more complicated, and it'll be better to implement that at the same time as the same for Nvidia, where we're currently only really setting the top end power level