MacBook Air M3 vs M4: Is the Upgrade Worth It?

The MacBook Air M4 is the better buy for anyone purchasing new, thanks to its lower $999 starting price, doubled base RAM (16 GB vs 8 GB), faster 10-core CPU, and improved 12MP webcam. But the MacBook Air M3 is now available refurbished at steep discounts, with floors around $679 (roughly $200-320 below the new M4), making it one of the best refurbished laptop values in 2026. The right answer depends on whether you are buying new or used, and how much Apple Intelligence matters to your workflow.

Quick comparison table

Performance: how much faster is the M4?

The M4 chip delivers a meaningful step up over the M3. According to Geekbench 6 benchmarks, the M4 Air scores approximately 3,692 in single-core tests compared to 3,043 for the M3, a gain of roughly 20-25 percent. Multi-core scores tell a similar story: around 14,819 for the M4 versus 11,687 for the M3, representing a 25-30 percent improvement.

In everyday tasks, that gap is rarely felt. Both chips handle web browsing, office work, photo editing, and video streaming without hesitation. The difference becomes noticeable in longer video exports, running machine learning models locally, and sustained workloads that push the chip for minutes at a time.

One caveat: both MacBook Air models are fanless. Under sustained heavy load, thermal throttling narrows the performance gap between the two chips. For short bursts, the M4 is clearly faster. For prolonged rendering sessions, the gap shrinks.

Apple Intelligence: the RAM factor

This is the section no competitor covers, and it matters more than any benchmark number.

Both the MacBook Air M3 and M4 technically support Apple Intelligence, Apple's on-device AI system introduced with macOS Sequoia and expanded in macOS Tahoe. But the base configurations tell very different stories.

The base M3 Air ships with 8 GB of unified memory. The base M4 Air ships with 16 GB. Apple Intelligence features run their models directly in RAM, alongside your open apps. On an 8 GB Mac running macOS Tahoe, users have reported memory pressure warnings appearing during normal multitasking sessions once AI features are active.

The M4's Neural Engine also runs Apple Intelligence tasks more than twice as fast. The M3's Neural Engine delivers 15.8 TOPS (trillion operations per second). The M4's Neural Engine delivers 38 TOPS, a 2.4x improvement that translates to faster Writing Tools responses, quicker image generation in Image Playground, and snappier Siri interactions.

If Apple Intelligence is central to why you want a new Mac, the M4's 16 GB base configuration is the minimum you should consider. If you are buying a refurbished M3 and plan to use AI features, prioritize the 16 GB configuration, which typically costs $100-150 more than the 8 GB model on the refurbished market but represents a significant quality-of-life improvement.

Design, display, and build quality

Here is where the two laptops converge almost completely. The M3 and M4 MacBook Air share an identical chassis. Both weigh 2.7 pounds (13-inch) and 3.3 pounds (15-inch). Both measure the same dimensions. You cannot tell them apart by looking or holding them.

The display is the same Liquid Retina panel: 13.6-inch or 15.3-inch, 60Hz, 500 nits peak brightness, P3 wide color, True Tone. Neither model offers ProMotion or a higher refresh rate. For readers choosing between the Air and Pro lines, the display is a key differentiator covered in our MacBook Air M4 vs MacBook Pro M4 comparison.

Three differences stand out between the M3 and M4 in terms of design and connectivity.

First, the camera. The M3 Air carries a 1080p FaceTime HD webcam, the same camera Apple shipped on MacBooks for years. The M4 Air upgrades to a 12MP camera with Center Stage, which keeps you framed in the shot automatically as you move around. For anyone on video calls for work, this is a genuine quality-of-life improvement.

Second, Thunderbolt. The M3 Air has Thunderbolt 3 ports. The M4 Air has Thunderbolt 4 ports. In practical terms, Thunderbolt 4 doubles the minimum guaranteed bandwidth for external storage and improves compatibility with the latest docks and displays.

Third, external display support. The M3 Air can drive two external monitors, but only when the laptop lid is closed. The M4 Air can drive two external monitors with the lid open or closed, a meaningful difference for anyone using the MacBook as a desktop replacement at a monitor stand.

Refurbished pricing: where the M3 shines

This is the angle no other comparison site covers, and it is the most important consideration for a significant portion of buyers.

Apple's M5 MacBook Air launched in March 2026, pushing both the M3 and M4 models deeper into the refurbished market. The supply of lightly used M3 Airs has grown substantially as owners upgrade to M4 and M5 models.

Current refurbished pricing looks like this:

• New MacBook Air M4 (13-inch, 16 GB, 256 GB): $999
• Refurbished MacBook Air M3 (13-inch, 8 GB, 256 GB): approximately $679-779
• Refurbished MacBook Air M3 (13-inch, 16 GB, 256 GB): approximately $799-880

That 16 GB M3 configuration, refurbished, runs $120-200 below a new M4. For buyers who do not need the M4's camera, Thunderbolt 4, or dual-monitor-with-lid-open support, that gap represents real savings.

Where to find them: Apple Certified Refurbished sells M3 Airs directly with a one-year warranty and a new battery and outer shell. Back Market, Amazon Renewed, and Gazelle offer competitive pricing from third-party sellers with their own warranty programs.

Compare all refurbished MacBook Air deals on RefurbMe to see real-time prices across every major seller side by side.

Future-proofing: how long will each last?

Both chips will receive macOS support for years to come. Based on Apple's historical support patterns, the M3 Air (released in 2024) should receive major macOS updates through approximately 2031-2032. The M4 Air (released in 2025) extends that window by roughly a year, to approximately 2032-2033.

The more important future-proofing question is RAM. Software requirements grow over time. The 16 GB base RAM on the M4 gives it a meaningful advantage for the second half of its support lifecycle. An 8 GB M3 Air bought today may feel sufficient in 2026 but constrained by 2029 as apps, browsers, and AI features claim more memory. For a detailed look at how long these machines last in practice, see our guide on how long MacBooks last.

The M4's Neural Engine advantage also matters for AI-driven software that has not yet shipped. Apple and third-party developers are building features that leverage the Neural Engine directly. A 38 TOPS engine will handle those tasks more gracefully than a 15.8 TOPS engine.

Who should buy the MacBook Air M3?

The M3 Air is the right choice for a specific buyer profile, and that profile is larger than most reviews acknowledge.

Budget-conscious buyers. If spending $999 on a new laptop is not comfortable, a refurbished M3 Air starting at $679 delivers 80 percent of the M4's capability at a meaningfully lower price.

Everyday task users. Browsing, email, documents, video calls, streaming: the M3 handles all of it without a hiccup. The 20-25 percent CPU gap is irrelevant for these workloads.

Students. The MacBook Air is one of the best laptops for college, and the M3 refurbished is the most affordable path into Apple Silicon for students who want reliability and longevity without the new-device price.

Users buying 16 GB configurations refurbished. A refurbished M3 with 16 GB RAM sidesteps the main Apple Intelligence concern and lands at a price that makes the upgrade math work in your favor.

Who should buy the MacBook Air M4?

New buyers prioritizing current value. At $999, the M4 Air is cheaper than the M3 was at launch. Apple made the entry price lower while doubling the base RAM. If you are buying new, the M4 is the obvious choice.

Apple Intelligence power users. If you rely on Writing Tools, Image Playground, Priority Notifications, and upcoming AI features in macOS Tahoe, the M4's 16 GB base configuration and 38 TOPS Neural Engine give you room to run those features without memory pressure.

Remote workers on frequent video calls. The 12MP Center Stage camera is a genuine upgrade over the M3's 1080p webcam. If you spend hours per week on Zoom, Teams, or FaceTime, the improvement is noticeable immediately.

Dual-monitor desktop users. The M4's ability to drive two external displays with the lid open is a practical advantage for anyone running a two-monitor setup at a desk.

Long-term ownership plans. If you intend to keep this laptop for five or more years, the M4's base RAM, newer Thunderbolt standard, and extended software support lifecycle make it the stronger investment.

Which should you buy in 2026?

The straightforward answer: if you are buying new, get the M4. Apple made it cheaper, more capable, and better configured for the AI era. There is no reason to buy a new M3 Air.

If you are open to refurbished, the M3 Air at $800-880 (16 GB configuration) is one of the best laptop values available right now. You give up the camera, Thunderbolt 4, and the dual-monitor-lid-open feature. You gain $120-200 in savings and a machine that will handle everything most people do on a laptop for the next five to six years.

The M5 Air's existence is actually good news for M3 buyers. It means two generations of owners are trading in M3 units, creating a larger pool of quality refurbished stock at competitive prices.

For guidance on where to buy with the best warranty and return policies, see our guide to the best places to buy a refurbished MacBook and our refurbisher comparison tool.