How much memory should you order with a Mac mini?

Order 16GB. That is the right configuration for most Mac mini buyers, and the check that tells you whether you are one of them costs nothing and takes about a minute on the Mac already on your desk. Apple charges $200 to take an M6 mini to 24GB and $400 to reach 32GB, and unlike the drive, that choice cannot be revisited after checkout. The M6 and M5 Pro minis ship Sept. 22.

The short answer

Route	Who it fits	Extra charge at checkout	The catch
Read Memory Pressure on the Mac you already own	Everyone, before the four rows below	$0	It describes the work you do now, on the machine you have now
M6 with 16GB, the included tier	A green graph and the same work next year: mail, browsing, documents, photo edits, most development	$0	Apple lists this configuration at 153GB/s, the lowest bandwidth in the line
M6 with 24GB	A yellow graph, or a habit of leaving several large apps open together	$200	For a local AI model it adds about 5.3GB the GPU can address, not 8GB
M6 with 32GB	A red graph, or a named job this Mac has never been asked to do	$400	The top of the M6; above it you are changing machine, not tier
M5 Pro with 48GB or 64GB	Models above the 27B class and long professional video work	$600 or $1,000, on a machine that starts at $1,699	Still an order rather than an upgrade, so the same rule applies

• Green graph today, same work tomorrow: order 16GB and put the $200 toward the drive, a display or nothing at all.
• Yellow graph: order 24GB. $200 is the cheapest insurance Apple sells against a machine you cannot change.
• Red graph, or a genuinely new job: order 32GB. It is the top of the M6 line, so above it you are choosing a different machine rather than a different tier.
• Buying the mini specifically to run local models: size for the model, not for the graph, and start at can your computer run a local AI model before you pay Apple anything.

Once the tier is settled, which store sells each configuration follows from it: Amazon lists the standard 16GB and 24GB models, while a 32GB M6 or a 48GB or 64GB M5 Pro is a custom build from Apple or B&H.

The check that costs nothing

Apple publishes the decision rule and puts it on every Mac you already own. Do this before you open the configurator.

1. Open Activity Monitor, in Applications and then Utilities.
2. Apple’s instruction is exact: “In the Activity Monitor app on your Mac, click Memory.”
3. Read the Memory Pressure graph at the bottom of that pane, and read Swap Used in the figures beside it.
4. Do it while your heaviest real work is open, not on a freshly restarted machine with one window.

Apple’s own reading of the three colors, from its Activity Monitor guide, checked Sept. 16, 2026:

• Green. “Your computer is using all of its RAM efficiently.”
• Yellow. “Your computer might eventually need more RAM.”
• Red. “Your computer needs more RAM.”

Four honest limits, because this is a measurement and not a prophecy. The graph describes your current workload on your current machine, so a green reading is evidence about the work you did today. An Intel Mac is not a like-for-like predictor of an Apple Silicon mini, where one pool of unified memory serves the CPU and the GPU together. A machine that has never been asked to do the new job cannot answer for it, so if you are buying the mini to edit 4K video or run a local model for the first time, size for that job instead. And Apple publishes no threshold number: there is no “swap above X gigabytes means order 24GB” rule on this page, because Apple does not state one and we are not inventing one.

What Apple charges for memory

Mac mini	Memory	Upgrade price	Added memory	Per added GB
M6, $899 base	16GB	Included	—	—
M6	24GB	$200	8GB	$25.00
M6	32GB	$400	16GB	$25.00
M5 Pro, $1,699 base	24GB	Included	—	—
M5 Pro	48GB	$600	24GB	$25.00
M5 Pro	64GB	$1,000	40GB	$25.00

The rate never moves. Every memory upgrade Apple sells on the new minis and Studios works out to exactly $25.00 per gigabyte, across seven options and four chips, and the bulk tiers rose to meet that rate rather than the base tier falling to it. Upgrade prices are Apple’s U.S. configurator prices observed Aug. 25, cross-checked against Daring Fireball’s configuration rundown; the $899 and $1,699 starting prices are from Apple’s announcement. Confirm your total in Apple’s configurator before ordering.

Apple’s technical specifications, read Sept. 16, 2026, list the M6 mini with 16GB configurable to 24GB or 32GB, a third M6 configuration that starts at 24GB, and the M5 Pro with 24GB configurable to 48GB or 64GB.

Two things worth knowing before you click. The M6 restores the 32GB option the M4 mini lost in last year’s shortage, so a tier that did not exist a generation ago is back. And ordering up costs the same as buying the larger model outright: the 16GB and 512GB M6 listed at $1,099 on Sept. 2 and the 24GB and 512GB model at $1,299, which is the same $200. There is no discount hiding in either route.

Why you cannot fix this later

Unified memory is part of the chip package. Apple lists it as a fixed attribute of each configuration on the specification page, sells it only as a configure-to-order option, and offers no memory upgrade for a Mac mini once it has shipped. Our local AI guide states the same rule for every Apple Silicon Mac: memory is soldered, so the fix is a different Mac rather than an upgrade.

Now put that beside the other upgrade on the same checkout page. An undersized internal drive is a problem you can solve any time you like, for $287.99 and up on the external SSD market we priced Sept. 15. An undersized memory order is solved by selling the machine and buying another one.

So the two upgrades deserve opposite instincts, even though they sit two clicks apart:

• Storage. Buy the smaller drive. If you are wrong, a cable fixes it, and at 2TB the external route saved $400.01 against Apple’s M6 price at Sept. 15 prices.
• Memory. Think harder. If you are wrong, nothing fixes it, and $200 is small against the cost of being wrong for four years.

That asymmetry, not a rule of thumb about gigabytes, is the actual argument for spending the $200 when the graph is yellow.

What the extra $200 also buys

Two checkable facts that almost no Mac mini buyer sees, both from Apple’s specification page and our own published arithmetic.

The M6 memory upgrade is also a bandwidth upgrade. Apple lists 153GB/s for the 16GB M6 configuration and 170GB/s once it is configured to 24GB or 32GB, and 307GB/s for the M5 Pro. That is 11% more memory bandwidth for the same $200, on the same chip name. Generation speed for a local model tracks bandwidth, which is why our estimates put the 16GB M6 near 30-31 tokens a second on a 7B model at 4-bit and the 24GB or 32GB M6 near 34: the bandwidth arithmetic and every estimate are on our Mac speeds page. Say the limit out loud: no M5 Pro or M6 machine has been benchmarked by anyone, so this is a specification comparison, not a measurement, and we will replace the estimates with real numbers when they exist.

No M6 tier reaches the memory the GPU wants. If the job is a local AI model, the GPU does not get all of the memory. Developers report in llama.cpp’s Metal memory discussion that macOS withholds about one third of unified memory from the GPU below 32GB and about one quarter above it, and the switch to the smaller reserve is gated above 32GB — a 32GB machine is still on the one-third side. Applying that as arithmetic:

Ordered	Extra charge	Roughly addressable by the GPU	Addressable gained	Per addressable GB
16GB	Included	about 10.7GB	—	—
24GB	$200	about 16GB	about 5.3GB	about $37.50
32GB	$400	about 21.3GB	about 10.7GB	about $37.50

Every M6 memory step costs about $37.50 for each gigabyte the GPU can address, 50% above Apple’s headline $25.00, because no M6 configuration crosses the reserve boundary. The first Mac mini that does is the M5 Pro, whose 48GB and 64GB tiers sit above it. So there is no better-value tier hiding in the M6 memory list: order the tier the graph and the job call for, not the one that looks cheaper per gigabyte. Three caveats belong with that table. The reserve is a community-reported figure rather than an Apple specification. It caps what the GPU can address, not what the machine has, so it does not describe Safari, Lightroom or Xcode. And the cap can be raised on a running Mac, which our local model guide covers among the free fixes along with the usable-memory arithmetic in full.

Three routes that cost less than $25 a gigabyte

Keep what you own. A green graph on a Mac that already does your work is the cheapest possible outcome of this page, and it is the most common one. If the machine is only slow at one specific thing, name that thing before you spend anything.

Buy a used machine that already carries the memory. Our daily tracker recorded these median in-stock asking prices on Sept. 15, 2026, from observations through 10:12 p.m. UTC: the Mac mini M4 at $820 across 445 offers from nine sources, lowest qualified ask $573; the M2 Pro at $1,042.49 across 46 offers from three sources; and the M4 Pro at $1,745.36 across 118 offers from seven sources, lowest qualified ask $1,149. Read those as a boundary check rather than a quote, for a reason we have to state plainly: the tracker classifies machines by product and chip and has no memory field, so each median mixes 16GB, 24GB and 32GB machines and cannot tell you what a used 32GB mini costs. What it does establish is the shape of the market a new 32GB M6 competes in at $899 plus $400. Live offers are on our M4 mini and M4 Pro mini pages and the daily tracker, none of which earns us anything.

Confirm the problem is actually memory. If Swap Used is low, the graph is green and the machine still feels slow, more memory will not fix it. A full internal drive is the usual culprit and the cheaper one, and our storage guide is the right page for that. Check System Settings, then General, then Storage before you pay Apple $400 for the wrong component.

Where to buy

Spend $0 first. If the graph is green and the job is not changing, the correct next action is to close this page.

Other stores. Apple’s configurator is the only place a new mini’s memory is chosen, and the tier you pick there is final. Apple certified refurbished lists exact configurations with a one-year Apple warranty and changes stock between visits. Swappa states the configuration on the listing. eBay carries the Money Back Guarantee but no grading. B&H sells the new machines as an authorized reseller.

Amazon. The M6 with 24GB and 512GB on Amazon is a link to one exact product, whose title on its own product page matched that chip, memory, storage and the 2026 model year on Sept. 16. Read the price, seller and stock on the listing itself — no Amazon price, seller or stock appears anywhere on this page, and Apple’s list prices above are manufacturer prices, not Amazon offers. We found no 32GB M6 or 48GB or 64GB M5 Pro on Amazon, so those tiers are ordered from Apple or B&H, as the store-by-configuration table shows.

Still choosing the machine rather than the tier? Our M4 and M4 Pro comparison prices the chip decision, the storage guide covers the other irreversible-looking choice on the same checkout page, and the used Mac buying checklist covers inspection. We revisit this page when Apple changes a memory tier or its price, and when the first measured M6 or M5 Pro benchmarks appear — at which point the bandwidth section stops being a specification comparison and becomes a measurement.