Heyo! You need some Vram cooling from behind! Seams like there are no thermal pads between the PCB and the Backplate. I have a 3070 Vision and used 2mm Thermal pds and was able to resolve the over heating. I have seen people use 3mm thermal pads for 3080's (Tho I can very clearly see the PCB flexing maybe go 2 or 2.5mm) so I def recommend buying some thermal pads (test our 2mm and 3mm but be sure that the thermal transfer rate is 6.0 W/m K or higher) and adding it to the back. To further better the cooling, get some copper heatsinks online! Your memory chips are currently cooking!