I’m going to MAKE it fit haha. I think I can get it in if I cut a small piece of the front panel (right behind the hard drive bracket). Will allow me to get it in, and then can still put the HDD bracket it back on. Basically making a hole that extends into the front chamber to have room to install the GPU.Sure, check this link (from my build log)
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Fitting MSI GTX 1080ti Gaming X in SM550 (15th December 2019)
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I analysed dimensions (& pictures) of TUF RTX 3080. Unfortunately I don't think it can fit an SM550.
Right now only XC3 from EVGA is compatible with SM550