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

The MacBook Air M4 is now the better buy new and refurbished. Buying new, it has a lower $999 list price, double the base RAM (16 GB vs 8 GB), a faster CPU, and a 12MP Center Stage webcam. Buying refurbished, the price argument that used to favor the M3 has reversed.

A refurbished 13-inch M4 starts at $849 on RefurbMe today. The cheapest refurbished 13-inch M3 in any configuration is $936. The older chip now costs more, so the M3 has one narrow case left: the 15-inch screen, where an 8 GB M3 still undercuts a 15-inch M4 by about $110.

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 88% (as of August 2026). Both figures come from the RefurbMe Refurbished Apple Price Index (RAPI). The 88% is a family-wide median that includes much older models, so it does not mean a current M3 or M4 sells for 88% 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, 14 August 2026.

Which Is Cheaper Refurbished, the M3 or the M4?

The M4, at 13 inches, and it is not close. On RefurbMe on 14 August 2026, the cheapest available refurbished 13-inch MacBook Air M4 is $849 (16 GB/256 GB, Good condition, Amazon Renewed, 15% below its $999 list price). The cheapest available refurbished 13-inch M3 of any configuration is $936, and that is an 8 GB machine. The newer chip is $87 less than the older one.

That inversion is new. In July 2026 the two sat within a few dollars of each other. Since then M3 supply has thinned while M4 units keep arriving from owners moving to the M5, and the M4's floor fell faster than the M3's.

The gap widens once you match memory. The cheapest 16 GB M3 anywhere in the RefurbMe catalogue is $970 (13-inch, 16 GB/512 GB, Good, Amazon Renewed). Against $849 for a 16 GB M4, there is no configuration at 13 inches where the M3 saves money.

The 15-inch is the exception. An 8 GB 15-inch M3 runs $879 (Good, Amazon Renewed) against $989 for the cheapest 15-inch M4 (16 GB/256 GB, Excellent, eBay Refurbished). If you want the bigger screen and 8 GB is genuinely enough for you, the M3 still saves about $110 there.

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, shipping this fall 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.

This is where the price inversion bites hardest. Every refurbished 13-inch M3 under $970 is an 8 GB machine, and every one of them misses the 12 GB floor. The cheapest M4, at $849, ships with 16 GB and clears it. If Apple Intelligence matters to you at all, the newer chip is now both the cheaper option and the only one at that price that qualifies.

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 August 2026

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

Apple's M5 MacBook Air launched in March 2026 at $1,099 for the 13-inch, pushing both the M3 and M4 deeper into the refurbished market. Two things followed. M4 units arrived in volume as first owners upgraded, dragging the M4 floor down. M3 supply thinned instead, because most M3 owners already sold into the M4 wave a year earlier.

Here is what you can find today on RefurbMe, verified live on 14 August 2026 and ordered with the highest-value seller first.

Back Market leads that list because it carries by far the deepest MacBook Air inventory on RefurbMe US: 128 of the 198 live refurbished MacBook Air products on the site, against 39 from Amazon Renewed and 41 from eBay Refurbished. Depth matters when you are hunting a specific memory and storage combination, because the cheapest listing for your exact configuration is more likely to exist there in the first place. Amazon Renewed currently holds the outright M4 floor at $849, and eBay Refurbished holds the 15-inch M4 floor at $989.

One caveat on grades. The $849 M4 is a Good unit, which means light cosmetic wear and full functionality; the $989 15-inch M4 is Excellent, which means near-indistinguishable from new. Compare grade to grade before you compare price to price, and check the return window, which runs 30 days on all three of those sellers.

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 14 August 2026 Apple's US refurbished MacBook Air stock is M5 only, 39 offers starting at $1,099, with no M3 or M4 Airs listed at all. If you want an M3 or M4 today, 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.

MacBook Air 11.6"

128GB SSD
1.4Ghz Intel Dual-Core i5 4th gen
4GB memory • Silver
2014 release

Good condition, by Amazon

$149

new $899 -83%

View deal

+1 deals

MacBook Air 13.3"

256GB SSD
1.8Ghz Intel Dual-Core i5 5th gen
8GB memory • Silver
2017 release

Fair condition, by plug

$219

new $1,199 -82%

View deals

+1 deals

MacBook Air 13.3"

1TB SSD
1.6Ghz Intel Dual-Core i5 8th gen
16GB memory • Space Gray
with Touch Id • 2018 release

Fair condition, by Mac of All Trades

$220

View deals

Compare all Refurbished MacBook Air

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 are confirmed for macOS 27 Golden Gate, 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 the 16 GB base on the M4 gives it 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. Now that a 16 GB M4 costs less than any 8 GB 13-inch M3, that headroom is not a premium you pay for; it is a premium you get for less. 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 has a much narrower case than it did a month ago, and at 13 inches it currently has none at all on price.

Buyers who want a 15-inch screen for the least money. This is the M3's one clear remaining win. An 8 GB 15-inch M3 at $879 undercuts the cheapest 15-inch M4 by about $110, and the two share an identical chassis and display.

Buyers who find a large-storage M3 cheap. The 13-inch M3 floor is a 1 TB machine at $936. If you need storage more than you need memory or speed, a heavily discounted high-capacity M3 can still make sense against a 256 GB M4.

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, 8 GB will not hold you back today.

Students shopping the 15-inch. The MacBook Air is one of the best laptops for college, and the 15-inch M3 is the cheapest route into a big-screen Apple silicon laptop. At 13 inches, send students to the M4 instead.

Who Should Buy the MacBook Air M4?

Almost every 13-inch buyer. This is the biggest change for 2026. A refurbished 16 GB M4 at $849 costs less than any refurbished 13-inch M3 on the site, so you get the faster chip, the 38 TOPS Neural Engine, double the memory, the 12MP camera, and Thunderbolt 4 for less money than the older machine.

New buyers prioritizing current value. At $999 the M4 Air lists below what the M3 cost at launch while doubling the base RAM, and it lists $100 below the M5. Buying new, the M4 is the obvious choice.

Apple Intelligence power users. If Writing Tools, Image Playground, and the new Siri AI arriving 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, get the M4. Apple made it cheaper, more capable, and better configured for the AI era than the M3 was at launch, and it now sits $100 under the M5.

If you are buying refurbished at 13 inches, get the M4 as well. At $849 it is $87 below the cheapest 13-inch M3 on the site and $121 below the cheapest 16 GB M3 anywhere, while adding the faster chip, the 12MP camera, Thunderbolt 4, dual-monitor-with-lid-open support, and clearance for the full Siri AI feature set. The advice from earlier in 2026, when the two were level at 16 GB, no longer holds. The M3 has simply been overtaken.

The only reason left to choose an M3 is the 15-inch screen on a tight budget, where $879 still beats $989. If you are cross-shopping the current generation as well, the MacBook Air M4 vs M5 comparison covers whether the newest chip is worth its premium.

The M5 Air's arrival is good news either way. Two generations of owners are trading in M3 and M4 units, and that is exactly what produced the floors above.

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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