Less than 50c? Im sure you are not talking about thoroughbreds, lol. The only time when I see my thoroughbred drop below 50c is when my window is open during a cool night (30-40 degrees) when the pc is in complete idel. When it gets warmer however during the summer, it runs around 58c-65c full load. I imagine a HSF blowing hot air isnt going to get it down below the 50c mark.