M3 Ultra: unified memory vs VRAM tables

Bandwidth ~819 GB/s · memory options [96, 256, 512] GB · year 2025.

Unified memory is shared with macOS and apps. Treat discrete VRAM “fits” as overstated unless you reserve headroom. Prefer VRAM fit with a higher overhead, and compare against discrete GPUs only as a contrast—not a 1:1 map.

Educational. Not a purchase guide.