The biggest difference comes down to how many cores each chip has as well as the maximum amount of supported memory. The M2 Max supports up to 96GB of unified RAM and features an 8-core CPU and 10-core CPU. The M2 Ultra supports up to 192GB of unified memory and features a 24-core CPU, 60-core GPU, and 32-core Neural Engine. This means that the M2 Ultra can perform more processes per second, giving you higher performance over Intel and M1-based Apple models.