The MacBook Air M2 launched in June 2022. The MacBook Air M4 launched in March 2025. If you own an M2 Air, the question is whether the M4 is a meaningful upgrade — or whether you should hold your machine for another 2-3 years.
What Changed M2 → M4
Apple's M4 chip is approximately 35-45% faster than M2 in sustained CPU workloads (video rendering, compilation, ML inference). In light tasks — web browsing, documents, email, Zoom calls — you will feel zero difference. The gap shows in tasks that push the CPU for more than a few seconds.
If you compile large Swift codebases, run local LLMs, edit 4K video in Final Cut Pro, or use ML-heavy creative apps (Stable Diffusion locally, etc.) — the M4 Air handles these noticeably faster than the M2.
Verdict: Invisible in typical daily use. Significant for compute-heavy workflows.
Display: 15.3" Option + Brighter
M4 Air added a 15.3" model option (vs 15.3" M3 Air already existing). The 13" M4 display hits 500 nits peak vs the M2's 500 nits — essentially the same. Color accuracy is consistent across M2 and M4 models.
Memory Bandwidth: Much Faster
M4 has 120GB/s memory bandwidth vs M2's 100GB/s. This matters most for GPU-accelerated tasks, running local AI models, and video work. For standard productivity, irrelevant.
Power Efficiency: M4 Uses ~10% Less Power
M4 delivers more performance at lower power, which translates to slightly longer battery life (18+ hours vs M2's 18 hours in Apple's tests) and slightly lower heat output. Both run fanless.
Connectivity: Thunderbolt 4 vs Thunderbolt 3
M4 Air supports Thunderbolt 4 (40Gbps bidirectional), M2 Air has Thunderbolt 3 (also 40Gbps but with different protocol support). Practical difference: Thunderbolt 4 certified hubs and docks have more guaranteed compatibility. For most users with existing USB-C peripherals, not a meaningful change.
Who Should Upgrade M2 Air → M4 Air
Upgrade makes sense if:
- Your M2 Air is 3+ years old and you're using it for compute-heavy work
- You run local AI models (LM Studio, Ollama, etc.) and hit M2 performance walls
- You need Thunderbolt 4 peripheral compatibility for a new dock/hub
- You can sell your M2 Air for $700-900 and keep the net upgrade cost low
Hold the M2 Air if:
- You use your Mac for typical productivity tasks (writing, browsing, email, Zoom)
- Your M2 Air is under 2 years old
- Your primary use case is covered by the M2's performance — Final Cut, Logic, Xcode all run well on M2
The M3 vs M4 Question
If you're buying a MacBook Air today, M4 is the clear choice — same price as M3 was, meaningfully faster, and sets you up for a longer usable lifespan. The M3 Air is still available at discount; unless the price difference is significant, M4 is the better long-term purchase.
Expected M2 Air Lifespan
Apple has supported Intel Macs (from 2017-2020) with security updates through 2025 — 5-8 years. Apple Silicon Macs are likely to receive even longer support given Apple's control over the full stack. An M2 Air bought in 2022 is realistically useful and supported through at least 2030.
See current MacBook Air options: Laptops category