iMac NEW Fan Speeds??

[dasx]

Hi!

I own a top tier 5K Retina iMac end-2014. I use it for heavy 4K work: importing, transcoding, editing and exporting. Very high temps regularly. CPU around 90-100ºC and GPU at 103-107ºC, since DAY 1.

Well, every since I bought I installed iStat Menus and I usually watch CPU and GPU temps as well as fan speeds, because sometimes I manually put them to HIGH to help cool down the computer further.
Top fan speeds always were 2700rpm. ALWAYS. I recently had some reboot and heat problems because of the GPU surpassing 110ºC and fans never went higher than 2700rpm.

BUT, since a couple of days back I noticed my fans are now spinning at 3300rpm. CPU temp doesn't go beyond 85ºC, and the GPU is at 99-100ºC when exporting the same 4K type of video.

Has anyone else noticed this? Did I miss something?

Thanks!
dasx

 

[T'hain Esh Kelch]

Dust in the exhaust, high ambient temperatures, drying thermal paste, etc.

 

[dasx]

Dust in the exhaust, high ambient temperatures, drying thermal paste, etc.

Either I didn't make myself clear or you didn't understand me at all.

Fan speed always had had a top speed of 2700rpm. Since a couple of days ago, it now has a top speed of 3300rpm. Forget about temperatures, that was a background.

 

[JustMartin]

obvious question is did you upgrade to 10.12.5 when that became available a couple of days back? Would narrow things down a little in terms of recent changes.

 

[Gav2k]

2700rpm is 100% the fans max. I'm wondering if your fan control software is falsely reporting the speed. You would defiantly hear a difference with a 600rpm increase.

 

[dasx]

2700rpm is 100% the fans max. I'm wondering if your fan control software is falsely reporting the speed. You would defiantly hear a difference with a 600rpm increase.

I do. If it's at 3300rpm and I manually set it to MAX in iStat Menus, speed drops to 2700rpm and noise is quieter.

 

[dlewis23]

Get a can of air and blow out the iMac from the exhaust then from the bottom. Had a similar issues but mine would turn off because the GPU would get to 109ºC.