AlphaZero using GPU while Stockfish uses CPU. Stockfish performs (an almost brute) force calculation of positions while AZ has to "Guess" which moves are better

AlphaZero using GPU while Stockfish uses CPU. Stockfish performs (an almost brute) force calculation of positions while AZ has to "Guess" which moves are better based on it's neural network. In this case GPU is much slower than CPU. If AZ could calculate 60 million moves per second, stockfish would have no chance to win against it. tldr: Higher is better.