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It's not something I have actually tested to give definitive results, but I would expect that with the Top XL-Vent some of the airflow from the case fan will be exhausting out the top of the case before it reaches the right side of the case and therefore reducing the "flushing" effect through the case.  With less airflow heading toward the GPU then more of the GPU exhaust heat can move back into the CPU chamber rather than being pushed straight out the case.