8GB cards
Treat 8GB as a conservative-settings target; reduce textures or RT first if memory pressure appears.
VRAM guide
Is 8GB VRAM enough for Forza Horizon 6?
TechSpot VRAM testing and Forza Support crash-code notes both point to memory pressure as a real PC tuning concern, especially with higher textures, Extreme preset choices, and ray tracing.
12GB+
TechSpot's testing indicates Ultra, Extreme, and base RT presets can push beyond 8GB.
16GB
Use 16GB-class cards for more headroom when targeting higher textures, RT, or 4K.
The goal is not just average FPS. VRAM pressure often appears as hitching, texture fallback, unstable frame pacing, or crashes categorized as out-of-video-memory errors.