I have an iMac 27'' 2010 late and GPU breaked for overheat. Personally I LOL about "protection from Apple". Personally, the internal fan control contained in the SMC chip in your computer is adequate to assure that the CPU and GPU do not overheat. Although you can play some games on them any game that makes heavy demands on the processors will cause them to become uncomfortably hot unless you take external cooling precautions. Apple does not even refer to them as "laptops." They are called "Notebook" computers. Apple's manuals tell you not to use them on your lap because of the possibility of burning your thighs or causing overheating damage to the computer. There isn't much room inside to provide huge cooling devices. Laptops run hot because they are small, thin, and light. I wouldn't recommend using any such software and trust that the Apple engineers know what they are doing. SMC Fan Control is essentially the same as iStat Menues. I don't know if Mac Fan Control acknowledges one fan for the CPU and one for the GPU, but if so, then, yes, I would set it up separately. On the computer I have that uses Macs Fan Control that is how I set it up. Tying to the hotter of the two cores assures that core won't overheat because the other core is cooler. Both cores are contained in a single chip, so the object is to cool the chip.
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