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heat from graphic cards

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Graphics cards heat up primarily in the VRM, GPU and vRAM areas. Heat naturally rises so there is some logic in a GPU being mounted "upside down" as any well placed side or front intake fan will be able to do a significantly better job of keeping a graphics card cool.

The problem you then have is any heat that is rising engulfs the CPU and VRM area of the mainboard. In a situation like this a air cooler for the CPU is a better choice than a AIO as it keeps the air flowing and moving which makes it easier for any top exhaust case fans to remove. Zen actually stays very cool assuming you aren't throwing over 1.3v through it with any good air or AIO cooler so heat is not a concern here, the mainboard VRMs are quite another story though.

You see, VRMs get got, extremely hot, when a CPU is under full load. There are thermodynamic solutions to this as well as VRM drivers which can help even further in spreading the thermal heat load by helping to make sure the VRMs have a more equal load. Combined with a good thermodynamic heatsink design and a heatpipe connecting the VRM heatsinks to further improve thermal load balancing it's possible to keep VRM temps relatively under control without the need of any extra fans.

Mounting a GPU "upside down" however would present a bigger problem to the VRMs so depending on the GPU a extra fan to aid the mainboard VRMs would be necessary which is likely why the idea of upside down GPU mounting fell out of favour quite quickly (yes it's been tried already). Thats the short story anyway, I could go in to a lot more detail but I'll leave it at that.
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