Summary: I'm not a computer guru, but when I buy a fan that is supposed to run at 800 rpm on low and 1200 rpm on high I take it at face value. It was running lower than both when I first put it in. 300 on low and 600 on high. After 2 days of being broke in it spins a constant 800 rpm now on the high speed setting. The stock fan that came with my Lian Li case spins in the 900's so I figure 800 will do the job. The blue LED is neat, Not too bright.