Exactly.
The purpose of the fans is to keep the temp down. Once that's been done, any more fan power (so to speak) is just wasted. With most computer cases, it causes turbulence, noise and dirt.
The nice thing about Speedfan is you set it up yourself. You can adjust individual fans, for the best effect and turn the program off altogether of you want to.
Currently, I have my CPU fan reduced to a certain extent, so its temp is stable and that fan speed increases as load on the CPU does.
My case fans are a different matter. Once I got my CPU fan under control, the onlt thing left to worry about was the internal case environment. I have disconnected the front fan altogether. It was noisy, in spite of being recently replace, and did very little. My back and side fans both run at about 15% to 20%, unless the case get warm, when they speed up befre returning to their usual speed.
One limitation. I use a NVIDIA graphics card. Though its temp is logged by SpeedFan, it fans are independent and must be managed by NVIDIA software. No big deal for me personally.
If you want to take a look at it, download it from MajorGeeks.
http://www.majorgeeks.com/content/p...f=FORID:10&ie=ISO-8859-1&q=speedfan&sa=Search
It can he found elsewhere, but the advantage of a site like MajorGeeks is they guard their reputation and carefully check each file for any corruptions.
Run it and have a look. Unless you put a tick in a rather obvious box on the front panel, it won't actually affect anyhting. It uses almost no resources and I have mine loaded at startup.
I don't know how much you know, but if you need any help figuring out how to use it please say and I will be happy to explain it all.
The first problem you will see is none of the labels seem to corelate to the actual fans. The labels in Speedfan are generic and correct. You need to work out which control is for each fan. Also, there are far more controls available than you will very need.
I currently control 3 of my fans. SpeedFan can manage, potentially about 30!