[mention=77388]CowboyRedBeard[/mention] Make sure you have the latest bios 3.3 and bmc firmware 3.48. Reason being, they sometimes update ipmi functionality and sensor names. Supermicro boards have 2 fan zones. Usually one zone is FANA (peripherals) and another zone for all other numbered fans like FAN1 FAN2 FAN3 FAN4. (FAN1234). Some boards have more numbered fans (FAN5 or 6) that are tied to the other numbered fans or like yours have FANB which I believe is tied to the same zone as FANA. The original intent of fan control was to monitor hard drive temps and control a zone of fans to cool hard drives. Since the bios fan control is based on cpu temps the fans don't usually spin up fast enough to maintain lower hard drive temps. E.g. during a parity check the cpu temps would not get hot enough to spin up the fans and the hdds would hit high 40C or 50s. So the fan control script monitors the hdds and uses the highest temp. So in order to control any zones you have to select a Temperature sensor to monitor in order for the fan control to work. If you want to use CPU temps you have to change from auto to a CPU temp sensor for that particular fan group. For your board you will have 2 zones: FANA & B on one zone and FAN1-6 on another zone. So you can select a temp sensor to use for each zone. You can use any temp sensor the bmc has listed or hdds temp. You can use the same for both zones if you like. Also the bmc thresholds still may be relevant. These aren't the same as what's on the Fan Control webgui page. These are alert thresholds set in the bmc. You can use Config Editor and select sensors to view and edit them. They cause a warning to appear in the bmc event log if the fan rpms go outside the thresholds set. So if the default threshold is 1000 rpms and your cpu fan drops below this, then the bmc kicks the fan to full speed and logs an alert. I hope all this helps clear up everything. Edit: you can change the high and low temp threshold after you select a sensor. They determine at what temp the fan will be at maximum speed and minimum speed.