Gigabyte posted the dimensions for their RTX 3080 cards. all of them are too long/thick.
Source: https://www.gigabyte.com/Comparison/Result/3?pids=7527,7528,7533,7553
XTREME: TBD (same cooler as the Master, so very unlikely to fit.)
MASTER: L=319 W=140 H=70 mm
GAMING: L=320 W=129 H=55 mm
EAGLE...