What are the differences between Apple Macbook M series processors?

Apple Silicon M-series processors in MacBooks are Systems-on-a-Chip (SoCs) differentiated primarily by generation (M1-M4) and tier (Base, Pro, Max). These two axes define CPU/GPU core architecture, process node, memory bandwidth, memory capacity, and specialized hardware.

Generational Differences (Base Chips)

• M1 (2020): Fabricated on TSMC 5nm. 8-core CPU (4 performance + 4 efficiency). 8-core GPU. 16-core Neural Engine. 68 GB/s memory bandwidth. Supports up to 16 GB unified memory.
• M2 (2022): Fabricated on enhanced 5nm. 8-core CPU (4 performance + 4 efficiency). 10-core GPU. 16-core Neural Engine. 100 GB/s memory bandwidth. Supports up to 24 GB unified memory.
• M3 (2023): Fabricated on TSMC 3nm. 8-core CPU (4 performance + 4 efficiency). 10-core GPU. 16-core Neural Engine. 100 GB/s memory bandwidth. Introduced hardware-accelerated ray tracing, mesh shading, and Dynamic Caching for the GPU. Supports up to 24 GB unified memory.
• M4 (2024): Fabricated on enhanced 3nm. 10-core CPU (4 performance + 6 efficiency). 10-core GPU. 16-core Neural Engine with significantly higher throughput. 120 GB/s memory bandwidth. Supports up to 32 GB unified memory. Includes dedicated media engines with enhanced video encoding/decoding.

Tier Differences (Within a Given Generation)

• Base (e.g., M3, M4): Found in MacBook Air and entry-level MacBook Pro 14”. Limited to 8-10 CPU cores, 8-10 GPU cores, and 68-120 GB/s bandwidth. Memory caps at 24-32 GB.
• Pro: Found in MacBook Pro 14”/16”. Increased core counts (10-16 CPU cores with a higher ratio of performance cores), 14-20 GPU cores, and 150-273 GB/s memory bandwidth. Supports up to 48 GB unified memory. Adds dual video encode/decode engines.
• Max: Found in MacBook Pro 14”/16”. Scales the Pro silicon. 12-16 CPU cores, 30-40 GPU cores, and 300-546 GB/s memory bandwidth. Supports up to 128 GB unified memory. Doubles the media engine capacity relative to Pro.
• Ultra: Fuses two Max dies. Note: The Ultra tier is exclusively available in Mac Studio, not MacBooks. It features 24-32 CPU cores, 60-80 GPU cores, 800-1000 GB/s memory bandwidth, and up to 192 GB memory.

Key Functional Vectors

1. Single-Thread Performance: Successive generations (transitioning from 5nm to 3nm) deliver compounding increases in per-core IPC (instructions per clock), with the M3/M4 showing a 15-20% generational uplift in single-core performance over M1.
2. GPU Capabilities: M1/M2 feature a unified shader architecture. M3+ adds hardware-accelerated ray tracing and geometry processing, enabling significantly improved 3D rendering and gaming performance compared to older generations.
3. Memory Architecture: Higher tiers (Pro/Max) utilize a wider memory bus (256-bit to 512-bit), providing exponentially higher bandwidth. This dictates performance ceilings for video editing, large dataset processing, and 3D modeling.
4. Neural Engine: Iterative speed increases across generations for AI/ML tasks, with the M4 generation introducing a custom cache architecture for optimizing local LLM inference and machine learning operations.