there are two independent fans, one for the cpu on the left and one for the gpu on the right. So it's perfectly normal for one to require more cooling than the other, depending on what kind of application you're running
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ASUS G750JX -- i7-4700 - 16GB - 128GB 840 PRO SSD + 1TB HDD - Nvidia GTX 770M - 120Hz 3D glossy display