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I think i would not put a 3090 in the A4 because this could be heat overkill. For the 3080 I would recommend:INNO3D GeForce RTX 3080 Ti X3 ( maybe the best card but hard to get)Nvidia 3080 FE (https://dan-cases.com/downloads/a4sfx_rtx30x0guide1.0.pdf)ASUS Turbo GeForce RTXTM 3080 (best internal temps)EVGA GeForce RTX 3080 XC3 (For best fit get a card without a backplate)
I think i would not put a 3090 in the A4 because this could be heat overkill. For the 3080 I would recommend: