Question about Mac Pro 5,1 temperature

[Synchro3]

Interesting... My CPUs diode reading generally sit at about 34-44 degrees at idle, yet the BOOST fans both spin at 1113 RPM, machine as in sig and latest version of OS X.

This thread might be useful relating to fan speeds: https://forums.macrumors.com/thread...-problems-with-non-apple-video-cards.1685629/

Just start CUDA-Z or OpenGL Extensions Viewer. Fans are running normally after again. I start CUDA-Z as startup item.

 

[w8ing4intelmacs]

Running 10.10.4

I haven't used smcfancontrol to set any fan speeds. I was just using it to get a reading of the fan speeds

 

[kwikdeth]

I can't speak for the specifics of the Mac pro cooling but 77C seems really high to me. Thats 170F. That's more what I would expect out of a video card.