I don't think hot air to would go back to the gpu as you have an airflow direction from the bottom fans (including the gpu blow through style fan design) to the top fans and out of the case.but the 3 I think you will pull that hot air of gpu back!
With the design on the current cards that hot air is more likely to be recirculated as the gpu (and its solid backplate) blocking the airflow quite a lot
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