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Elmofongo: What happens if I set it to 100%?
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RWarehall: A 100% would be noisier, but would give max cooling. Ideally, you'd have it set up to dynamically spin up as needed for the load. It should be allowed to go to 100% if it needs to.
At this point I don't care if it's noisey. I am wearin headphones most of the time and I will set the volume to its highest.

Dynamically move the fan you say? Don't know how to do that. Sometimes I wish you guys come to this island to help me in person.
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Random_Coffee: Is the fan speed capped to 50 % all the time, or does the fan speed adjust proportional to GPU load?

Many of the 970's have settings that makes them turn the fans off when the temperature is low enough, and the fans spin up as they should when you play GPU-intensive games.
Personally I dislike and don't trust this kind of mechanism. My 960 reaches 72 degrees with it on auto, while not harmful I'd rather not have an egg boiler in my case so I set it manually at 40% speed and caps to 51 degrees which is much better.
What GPU do you have? Most of them should be set to dynamic fan on default. If you changed it, it should be to turn on again in graphics control program. Like Catalyst Control or Nvidia Control Panel.
Are you sure it's the GPU overheating?
My experience with my old Radeon overheating (after some serious overclocking) was that the screen froze with garbled colors before shutting down.
If it's the PSU it will just shut down with no system hangs before it.

You could consider liquidcooling.
http://www.evga.com/precision/
Here's the site for that program he has you using.
In fact, it seems you can draw your own fan speed "curve"

There is a little graph showing that.

From the FAQ...
Q. How can I set a custom fan curve?
A. Click the Fan Curve button, then select “Enable software automatic fan control”. After this you can setup a custom fan curve.
I think it may be a bios setting causing this, I've seen it many times on clients' computers. The bios is set to shut down the system once the CPU reaches a certain temperature.

If the setting is set too low that may be his answer.