NCM plays each Stockfish dev build 20,000 times against Stockfish 14. This yields an approximate Elo difference and establishes confidence in the strength of the dev builds.
NCM uses dual CPU Xeon E5-2670 16 core dedicated servers to perform its dev build tests. Each server plays 7 games concurrently with 30+0.3 time controls. Hash is set to 64, and Threads is set to 2 so each engine runs using 2 processor cores.