Fans increasing system temperature

[Dave Thompson]

Hello,

I have a Gigabyte GA-H81M-DS2V mobo.
I have a PSU fan sucking air out of the machine, position directly over the CPU.
I have my GPU in the lower half of the case.
I recently bought 2 fans, and I fitted one at the front bottom pushing air in, and an exhaust at the back near the CPU and PSU. Here's the thing: When I use easytune to adjust the fans, the system temperature changes in a bizarre way. If I set the fans to 0, the system temp settles at a low 38c, if I have them both on low-medium, about (1200rpm), the temp increases to 45. If I turn them up to full blast (leaving the CPU fan on normal), the temp comes back down again to about 0 speed values. I am guessing this is just air flow pushing hot air onto the sensor (where ever that is), but is it anything to be concerned about?

Thanks for ideas.

 

[AAndersen]

Are you using at stock cooler on your mobo?

 

[Dave Thompson]

Are you using at stock cooler on your mobo?

I believe so. It was bought as a new-build from a private seller. It has "intel" on it, and my CPU is an Intel core i3 4130. The air comes out the side of the heatsink. I hear the system temp sensor is the North-bridge chip? I hear lot of stuff, but never know what to believe. I can't see how to set up my fans any better really. The GPU has a fan on it, but being in the lower half of the case, is the reason why I wanted a case fan blowing it's way. I also thought it would help out the exhaust fan that seems to be competing with the CPU and PSU. Those temperature respond like that quickly, with few seconds

 

[AAndersen]

Are you using at stock cooler on your mobo?

I believe so. It was bought as a new-build from a private seller. It has "intel" on it, and my CPU is an Intel core i3 4130. The air comes out the side of the heatsink. I hear the system temp sensor is the North-bridge chip? I hear lot of stuff, but never know what to believe. I can't see how to set up my fans any better really. The GPU has a fan on it, but being in the lower half of the case, is the reason why I wanted a case fan blowing it's way. I also thought it would help out the exhaust fan that seems to be competing with the CPU and PSU. Those temperature respond like that quickly, with few seconds

I had the same problem once, it turned out i had set the fan in a possition where it would blow/suck air from the case in a way that slowed the CPU fan down but alot, i would recommend trying to unplug the rear fan try again see if you get the same temps. If the temp is lower it was probably because of the rear fan airflow, if you still wanted it there then i would orient it the other way and see if the problem came back, if it does, i would just remove the fan, or get a new CPU Cooler

 

[Dave Thompson]

Are you using at stock cooler on your mobo?

I believe so. It was bought as a new-build from a private seller. It has "intel" on it, and my CPU is an Intel core i3 4130. The air comes out the side of the heatsink. I hear the system temp sensor is the North-bridge chip? I hear lot of stuff, but never know what to believe. I can't see how to set up my fans any better really. The GPU has a fan on it, but being in the lower half of the case, is the reason why I wanted a case fan blowing it's way. I also thought it would help out the exhaust fan that seems to be competing with the CPU and PSU. Those temperature respond like that quickly, with few seconds

I had the same problem once, it turned out i had set the fan in a possition where it would blow/suck air from the case in a way that slowed the CPU fan down but alot, i would recommend trying to unplug the rear fan try again see if you get the same temps. If the temp is lower it was probably because of the rear fan airflow, if you still wanted it there then i would orient it the other way and see if the problem came back, if it does, i would just remove the fan, or get a new CPU Cooler

My CPU temps are fine though, it's just the system temp that is acting strange

 

[AAndersen]

Oh must have read it wrong then :O in that case it might be a error with the fans if you have them plugged into the MOBO