Same with me my specs are similar to yours: AMD Ryzen 7 7700, AMD Radeon RX 6800 16GB, 32GB DDR5, running the game on 1440p resolution and the logs shows
"""
2025-12-06 19:52:37.445 FTG 'C:/Users/&&&/Documents/My Games/Mods/rcs/FS25_Ray_County/data/densityMap_groundFoliage.png' max needed CPU instances = 0.748505 MB / 72.378906 MB
2025-12-06 19:52:37.603 Error: Run out of memory
2025-12-06 19:52:37.603 Error: Failed to allocate Buffer Memory!
2025-12-06 19:52:37.603 Error: Failed to create Buffer Resource 'unknown
'"""
And im sure i can run RCS maps since i've did one myself yesterday with Thundr's RCS Beta version and it worked fine (had bad fps in corn fields but the map was 4x and the map itself loaded fine)