Catalyzes the irreversible reduction of 2,3-butanediol to (S)-acetoin in the presence of NADH. (R)-acetoin + NAD(+) = diacetyl + H(+) + NADH Binds 2 Zn(2+) ions per subunit. Expression is controlled by the PDR1 transcription factor and the glucose-responsive transcription factor RGT1. Present with 3090 molecules/cell in log phase SD medium. Belongs to the zinc-containing alcohol dehydrogenase family.