I appreciate to everyone who sharing thier knowledge. I know it is Vue forum but I got great guys here to ask it ! :D @ Cheers : Zalman cpu cooler I use works maximum 1750-1800rpm. Also I have 2 120mm one 90mm fans on the case. And I guess the system fan is the intake fan on the front of the case. Maximum rmps of these fans are 1400rpm for 120mm and 1800rpm for 90mm (it is a Thermaltake Tsunami Dream case). I am also checking the bios frequently, I got same degrees on PC Health Status.