World class quiet and efficiency be quiet straight power 10 400w provides a new level of silent performance for systems that demand whisper quiet operation without compromising on power quality the superior features are virtually inaudible silentwingsreg 3 135mm fan with improved fan frame big funnel shaped fan opening of the psu case induces high airflow intake 80plusreg gold power efficiency up to 93 three high performance 12v rails power signal stability unmatched in its clas