Confused about PWM and DC mode for different fans in my Asus mb

DC AUTO dc auto slot Durable Construction:Built with a permanent magnet and drip-proof features, this motor withstands the rigors of racing and slot car play Small Engine ComHigh dc slot The best way is to put a meter on the battery, and depending on the battery a reading with the vehicle slot car racing for 12 years, building

dc auto slot Association of American Railroads Signal Section Com IV - Auto slot coil , or when breaking non