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I just tried to fit the Gigabyte RTX 3080 Vision OC. I think the 3090 has the same dimensions. There is plenty of room - by SFF means. I did not thermal test it yet. I feel like 2x 140mm fans would cover more of the GPU's heat sink than the 120mm fans I used until now for my 1080 Ti.[MEDIA=imgur]a/i40uuAk[/MEDIA]
I just tried to fit the Gigabyte RTX 3080 Vision OC. I think the 3090 has the same dimensions. There is plenty of room - by SFF means. I did not thermal test it yet. I feel like 2x 140mm fans would cover more of the GPU's heat sink than the 120mm fans I used until now for my 1080 Ti.
[MEDIA=imgur]a/i40uuAk[/MEDIA]