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Hi,
I'm using Lian Li Dynamic EVO XL for 2x4090 + 1x4070tiSuper (Pcie 4.0 x4 via chipset). You can bye "Upright Mounting Kit" + 900mm Riser Cable* and separate the GPUs. If you need better airflow there is also "front mesh kit" , so you can also ad 3x140mm front intake fans.
If you have any questions, don't hesitate to ask
*You can made the build with 600mm as well, but its on the edge. I couldn't because of the 3th GPU, so I went for 900mm