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Yes that's what I've found with the SG13 as well, the CPU sits in its own little compartment at the back of the case and just cooks itself with heat re-circulation.  If you put a 140mm fan in the front of the case as an exhaust it just pulls air from the front half of the GPU side vent rather than through the entire case.  If you set the front fan to push cool into the system it struggles to provide adequate airflow due to the intake side of the fan being severely restricted, what little air does make it into the case then exits out the side vents before making it to the CPU zone of the case.