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

A refurbished 13-inch M3 starts at $799 on RefurbMe today; a refurbished 13-inch M4 starts at $925. At 15 inches the gap runs the same direction, $739 for the cheapest M3 against $975 for the cheapest M4. The M4 keeps real advantages, a faster chip, guaranteed 16 GB memory on every configuration, and a better webcam, but it no longer wins on price.

According to RefurbMe's tracking, a new MacBook Air first reaches the refurbished market a median of 99 days after Apple's release, and the median Refurb Discount across every MacBook Air model RefurbMe has tracked is 86% (as of September 2026). Both figures come from the RefurbMe Refurbished Apple Price Index (RAPI). The 86% is a family-wide median that includes much older models, so it does not mean a current M3 or M4 sells for 86% off. What it shows is how fast and how far MacBook Air prices fall once units enter the refurbished channel, which is exactly why the M3 and M4 are worth comparing against a new machine today.

Quick Comparison: MacBook Air M3 vs M4

Here are the key differences at a glance.

Sources: MacBook Air (13-inch, M3, 2024) Tech Specs, MacBook Air (13-inch, M4, 2025) Tech Specs. Refurbished floors verified live on RefurbMe, 24 September 2026.

Which Is Cheaper Refurbished, the M3 or the M4?

The M3, at both screen sizes, and the gap is not small. On RefurbMe on 24 September 2026, the cheapest available refurbished 13-inch MacBook Air M3 is $799, a 16 GB/256 GB configuration tied between Amazon Renewed and Back Market. The cheapest available refurbished 13-inch M4 is $925 (Back Market), and that is a 512 GB unit, double the storage of the M3 listing, yet still $126 more. Match the storage instead and the gap widens: a 256 GB M4 starts at $999 (eBay Refurbished), $200 above the M3.

That is a full reversal. In mid-September the M4 floor sat around $845, below the M3. Since then M4 supply has thinned while M3 units keep arriving, and the M3's floor fell further while the M4's drifted back up.

At 15 inches, the M3 has held the price edge for longer. The cheapest 15-inch M3 is $739 (8 GB/256 GB, Amazon Renewed) against $975 for the cheapest 15-inch M4 (16 GB/256 GB, Back Market), a $236 gap. Matching memory narrows it: a 16 GB 15-inch M3 runs $812 (Back Market), still $163 under the M4.

There is no configuration, at either screen size, where the M4 is the cheaper refurbished buy right now.

Performance: How Much Faster Is the M4?

The M4 chip delivers a meaningful step up over the M3. On the Geekbench 6 Mac benchmarks, the M4 Air posts roughly 3,700 single-core and about 14,800 multi-core, compared with roughly 3,150 single-core and about 12,000 multi-core for the M3. That works out to around 15 to 20 percent faster single-core performance and around 20 to 25 percent faster multi-core performance.

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 applies to both models: neither has a fan. Under sustained heavy load, thermal throttling narrows the performance gap between the two chips. For short bursts of demanding work, the M4 is clearly faster. For prolonged rendering sessions, the gap shrinks considerably.

The M4 also ships with 120 GB/s memory bandwidth versus 100 GB/s on the M3, a 20 percent improvement that benefits GPU-heavy tasks and large data operations.

Apple Intelligence: The RAM Factor

This is the section that decides the M3 versus M4 question for a lot of buyers, and it matters more than any benchmark number.

Both the MacBook Air M3 and M4 support Apple Intelligence, Apple's on-device AI system introduced with macOS Sequoia and expanded in later releases. 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, users report memory pressure warnings appearing during normal multitasking once AI features are active. The experience degrades in ways that are noticeable: slower Writing Tools responses, lag when switching apps, and more frequent page-outs to storage.

The M4's Neural Engine also runs Apple Intelligence tasks far faster. The M3's Neural Engine delivers 18 TOPS (trillion operations per second). The M4's Neural Engine delivers 38 TOPS, more than double the M3, which translates to quicker Writing Tools responses, faster image generation in Image Playground, and snappier Siri interactions.

The stakes rose at WWDC in June 2026. Apple previewed the next generation of Apple Intelligence and a rebuilt Siri AI, which shipped on September 14, 2026 in macOS 27, named macOS Golden Gate. Its most demanding new features, including the more expressive Siri voices and the big systemwide dictation accuracy gain, require an M3 or later chip with at least 12 GB of unified memory. That leaves 8 GB Macs, such as the base M3 Air, outside the cutoff, while the 16 GB M3 and every M4 configuration clear it.

The price move changes this calculation too, but not in the M4's favor. The cheapest 13-inch M3 on RefurbMe today, at $799, is a 16 GB configuration, so it already clears the 12 GB memory floor. Apple never sold an 8 GB M4 Air, so every M4 configuration clears that floor too, but at 13 inches you no longer pay a premium for that guarantee against an 8 GB M3, only against a 16 GB M3 that already qualifies. The exception is the 15-inch M3, where the cheapest listing, at $739, is an 8 GB unit that misses the floor; clearing it there costs $812, still $163 under the 15-inch M4. Check the memory figure on the listing before you buy an M3: 8 GB and 16 GB units are both live on RefurbMe at different sizes and prices, and only the 16 GB one runs the full Siri AI feature set.

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), with the same dimensions and the same aluminum construction. You cannot tell them apart by looking or holding them.

The display is also the same: a Liquid Retina panel at 13.6 inches or 15.3 inches, 60Hz, 500 nits peak brightness, P3 wide color, True Tone. Neither model offers ProMotion or a higher refresh rate. For buyers weighing the Air against the Pro lines, the display difference is covered in the MacBook Air M4 vs MacBook Pro M4 comparison.

Three practical differences stand out between the M3 and M4.

First, the camera. The M3 Air has a 1080p FaceTime HD webcam. The M4 Air upgrades to a 12MP camera with Center Stage, which automatically keeps you framed as you move around during calls. For anyone on frequent video calls for work, this is a genuine daily improvement.

Second, Thunderbolt. The M3 Air has Thunderbolt 3 ports. The M4 Air has Thunderbolt 4. In practice, both support 40Gb/s transfer speeds, but Thunderbolt 4 offers better compatibility with newer docks, external storage, and peripherals.

Third, external display support. The M3 Air can drive two external monitors, but only when the laptop lid is closed. The M4 Air drives two external monitors with the lid open or closed, a meaningful difference for anyone running a two-monitor desktop setup.

Refurbished Pricing: The Live Numbers in September 2026

This is the most important section for a large share of buyers, and the pricing shifted enough since August to reverse the recommendation again.

Apple's M5 MacBook Air launched in March 2026 at $1,099 for the 13-inch, then Apple raised that to $1,299 on 25 June 2026 (the 15-inch went from $1,299 to $1,499 the same day). Both moves pushed the M3 and M4 deeper into the refurbished market as buyers traded up. M4 units arrived in volume through the summer as first owners upgraded, dragging the M4 floor down toward $845 by mid-September. Since then the M3 floor has fallen further and faster, past the M4's, while the M4 floor has drifted back up.

Here is what you can find today on RefurbMe, verified live on 24 September 2026.

The two cheapest 13-inch M3 listings, from Amazon Renewed and Back Market, are tied at $799. eBay Refurbished holds the matched-storage M4 floor at $999 for a 256 GB unit, while Back Market's $925 M4 listing is a 512 GB unit, more storage for less than that smaller M4, a reminder to check storage and memory on every row rather than the headline price alone. Back Market carries the deepest MacBook Air catalogue on RefurbMe overall, so it is the best starting point if you are hunting a specific configuration outside the rows above. The return window runs 30 days across Amazon Renewed, Back Market, and eBay Refurbished.

Apple Certified Refurbished is the trust option in this family, but two things are worth knowing before you wait for one. First, Apple's promise of a new battery and a new outer shell applies to iOS devices only. Apple's refurbished program page states that refurbished iOS devices will come with new battery and outer shell, and a Mac is not an iOS device. A refurbished Mac gets genuine Apple replacement parts as needed, a thorough clean and inspection, a brand new white box, and Apple's standard one-year limited warranty, with no guaranteed new battery or casing. Second, as of 24 September 2026 Apple's US refurbished MacBook Air stock remains M5 only, with no M3 or M4 Airs listed at all; live Apple Store offers today are all 15-inch, six of them starting at $1,529, with no 13-inch M5 currently in stock at Apple. If you want an M3 or M4 today, or a 13-inch M5, Apple is not currently an option.

Compare all current refurbished MacBook Air prices on RefurbMe to see the full picture across sellers, since these floors move week to week.

Future-Proofing: How Long Will Each Last?

Based on Apple's historical support patterns, the M3 Air (released in 2024) should receive major macOS updates through approximately 2031 to 2032. The M4 Air (released in 2025) extends that window by roughly one year, to approximately 2032 to 2033. Both run macOS 27 Golden Gate, released on September 14, 2026, which drops every Intel Mac but supports all Apple silicon models.

The more consequential future-proofing question is RAM. Software requirements grow over time, and 16 GB gives a machine a real advantage in the second half of its support lifecycle. An 8 GB M3 Air bought today may feel adequate in 2026 but constrained by 2029 as browsers, AI tools, and operating system footprints expand. Every M4 configuration ships 16 GB by default, so that headroom is guaranteed regardless of which listing you buy; a 16 GB M3 gets you the same headroom for less money now that the M3 floor sits below the M4's, provided you buy the 16 GB configuration rather than the cheaper 8 GB one. For a detailed look at how long these machines last in practice, see the 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 handles those tasks more gracefully than an 18 TOPS engine, extending the M4's capable lifespan in that area.

Who Should Buy the MacBook Air M3?

The M3 now has the stronger price case at both screen sizes, a reversal from where it stood a month ago. The one condition: confirm the memory on the listing before you buy.

Buyers who want the lowest price at either size. At $799 for the cheapest 13-inch configuration and $739 for the cheapest 15-inch configuration, the M3 undercuts every current M4 listing on RefurbMe.

Buyers who want a 15-inch screen for the least money. The M3 remains the cheaper way into the bigger screen, $739 against $975 for the cheapest 15-inch M4, a $236 gap, and the two share an identical chassis and display.

Everyday task users who do not need Apple Intelligence. Browsing, email, documents, video calls, streaming: the M3 handles all of it without hesitation. If Writing Tools, Image Playground, and the new Siri AI are not part of your daily workflow, memory size will not hold you back either way.

Buyers who confirm 16 GB before checkout. The $799 and $812 configurations above both carry 16 GB and clear the 12 GB memory floor macOS 27's Siri AI features require. The cheapest 15-inch M3, at $739, is an 8 GB unit that misses it. The listing states the memory size; read it before you buy.

Students on a budget. The MacBook Air is one of the best laptops for college, and the M3 is now the cheaper route into Apple silicon at either screen size, provided the 8 GB base configuration covers your workload.

Who Should Buy the MacBook Air M4?

Buyers who do not want to check the listing's memory. Every M4 configuration ships 16 GB standard and clears the Apple Intelligence memory floor by default. The M3 clears it too, but only in specific configurations, and its cheaper 8 GB units are also live on RefurbMe at both screen sizes. If you would rather not compare SKUs, the M4 removes that step, at a premium of $126 to $236 depending on size.

Apple Intelligence power users. If Writing Tools, Image Playground, and the new Siri AI that arrived with macOS Golden Gate are central to your workflow, the M4's 16 GB base and 38 TOPS Neural Engine give you the headroom to run them without memory pressure, and every M4 configuration clears the 12 GB memory requirement for the full feature set.

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

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. The M3 requires the lid to be closed for the same configuration.

The Bottom Line

If you are buying new, Apple only sells the M5 now; it discontinued the M4 as a new model when the M5 shipped in March 2026. The M5 starts at $1,299 for 13 inches, $300 above the M4's old $999 launch price, so buying new costs more than it did a year ago for a comparable upgrade.

If you are buying refurbished, the M3 is the better value at both screen sizes today, a reversal from where this comparison stood in August. At 13 inches it is $799 against $925 for the cheapest M4, a 512 GB unit, or $999 matched at 256 GB, a swing of $126 to $200. At 15 inches it is $739 against $975, a $236 gap. Choose the M4 anyway if you want the faster chip, the 12MP camera, Thunderbolt 4, dual-monitor-with-lid-open support, or a configuration that clears the Apple Intelligence memory floor without checking the listing. Choose the M3 if price is the deciding factor, and confirm you are buying a 16 GB unit, since the 8 GB configuration is also still live on RefurbMe at both sizes.

These floors move week to week as M5 buyers trade in their old machines, so re-check current prices on RefurbMe before you buy. If you are cross-shopping the current generation, the MacBook Air M4 vs M5 comparison covers whether the newest chip is worth its premium.

For guidance on where to buy with the best warranty and return policies, see the best places to buy a refurbished MacBook and the refurbisher comparison tool. If you are still deciding between the Air and Pro lines, the MacBook Air M4 vs MacBook Pro M4 comparison covers that question in depth.

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