Temperature sensor on case fan

[Marcus King]

I have a Vantec Thermoflow 92mm Double Ball Bearing Temperature Controlled Case Fan with a 3/4 pin connector. I plugged it into the PSU to max out the RPM. I Plugged it into the mobo as well to see what the RPM was at, and it said 1950rpm while it was connected to both PSU and MOBO. Its max RPM is 3100.

Is this just the motherboard taking control over RPM? I removed it from the mobo slot so it's only running off of PSU, but it says it is an auto sensor controlled case fan, which makes me worry that a sensor inside the fan is controlling RPM.

Link to fan: http://www.newegg.com/Product/Product.aspx?Item=N82E16811999617

 

[rolli59]

The fan it self has no sensor, the motherboard can slow it down by reducing volts but from the PSU it runs on full 12 volts.

 

[imomun]

I have a Vantec Thermoflow 92mm Double Ball Bearing Temperature Controlled Case Fan with a 3/4 pin connector. I plugged it into the PSU to max out the RPM. I Plugged it into the mobo as well to see what the RPM was at, and it said 1950rpm while it was connected to both PSU and MOBO. Its max RPM is 3100.

Is this just the motherboard taking control over RPM? I removed it from the mobo slot so it's only running off of PSU, but it says it is an auto sensor controlled case fan, which makes me worry that a sensor inside the fan is controlling RPM.

Link to fan: http://www.newegg.com/Product/Product.aspx?Item=N82E16811999617

Your fan has a temperature control sensor input in the yellow single plug to get rpm speed information . The temperature control sensor in motherboard adjusts the fan speed automatically. motherboard might has a fan speed profile in bios that control a fan pluged in motherboard socket. Software monitoring is not always accurate on fan rpm.

 

[Marcus King]

I have an Inspiron 570 motherboard. It is said that you can't control rpm, that the mobo sets a limiter on the fans. I used a 3 pin to connect to the 4 pin CPU cooling socket to bypass the bios settings. Speedfan doesn't work either with changing rpm. I'm probably going to have to get different fans that don't vary in rpm. Cooling is important because I'm running a 125w processor (not OC) and will be putting in a GeForce gtx ssc 650 Ti 2gb gpu.

 

[Kisianik]

Have we met before, someone in the other forum had the same problem with the same fan, you have to use constant speed fan with 3/4 pin connectors anyway, otherwise BIOS will take control.
And for 650 card I strongly recommend MSI 650 TI PE with gigantic fan, probably the coldest fan out there! I am using 550 version so I know!