Apple Mac mini (2018) upgrade guide

Lifecycle and support

Manufacturer support ended on April 2025.

Dates not listed haven't been published by the manufacturer or a reliable third party.

Memory (RAM)

This is the only upgrade you can make inside the Mac mini (2018). It has two 260-pin DDR4 SO-DIMM slots, using standard PC4-21300 DDR4-2666 MT/s non-ECC unbuffered modules. There is no soldered memory on the SO-DIMM channel, so all of the memory is in the two slots.

Limits: 32 GB per module, 64 GB total (2 × 32 GB). Both slots are populated from the factory with two modules (typically 2 × 4 GB), so a memory upgrade means removing both factory modules and replacing them as a pair.

Physical access: the modules sit on the logic board under a metal RF shield held by four Torx screws, behind the bottom cover. Apple's own documentation is the last word on opening the case — see the user guide in our references — and iFixit's teardown is a good visual companion.

One important caveat: Apple's support page states that the Mac mini (2018) does not have user-installable RAM and directs upgrades to an Apple Store or Apple Authorized Service Provider. Teardowns and memory vendors, by contrast, document ordinary SO-DIMM slots that an owner can reach. In practice this means the machine is electrically a standard two-slot SO-DIMM design and is DIY-upgradeable, but Apple treats self-service as outside its process — so a self-upgrade can complicate warranty service. Keep the factory modules and put them back before any Apple repair.

Buying tips:
- Buy 260-pin PC4-21300 DDR4-2666 SO-DIMMs, non-ECC and unbuffered.
- To hit 64 GB you need two 32 GB modules; larger per-module capacity is not supported.
- Matched modules of the same type are the safe choice.

Buying tips

• 260-pin PC4-21300 DDR4-2666 SO-DIMM, non-ECC unbuffered
• 64 GB means two 32 GB modules — that is the platform maximum
• Both slots are filled from the factory, so budget for a matched pair

Steps: fitting memory safely

The outline below covers the only upgrade the Mac mini (2018) supports. For the exact disassembly of your machine, follow Apple's user guide linked in our references; iFixit's teardown shows the same procedure in photos.

1. Back up your Mac first. Any time you open a computer, you want a current backup before you start.
2. Shut the Mac down completely, switch it off at the mains and unplug the power cable and all connected cables.
3. Ground yourself — touch a grounded metal object or use an anti-static wrist strap — so you do not discharge static into the logic board or modules.
4. Open the case as described in the owner's manual. On this model that means removing the bottom cover, then removing the four Torx screws that hold the metal RF shield over the memory slots.
5. Release the existing modules from their clips, take them out and fit the replacement SO-DIMMs the same way round, pressing firmly until the side clips click.
6. Replace the RF shield and its four screws, refit the bottom cover and reconnect the cables.
7. Switch the Mac back on and confirm the new memory is recognised before you start using the machine again.

Set the old modules aside in an anti-static bag. Reinstall them before any Apple service visit, since Apple treats memory as non-user-installable.

Buying tips

• Back up before you open anything
• Four Torx screws hold the RF shield over the memory slots
• Keep the factory modules for warranty service

How to upgrade

Before you start

• Back up your data before opening the case
• Shut down, switch off and unplug the power cable
• Ground yourself to avoid static damage
• Check your warranty position — Apple treats memory as non-user-installable

Steps

1. Back up your Mac
   Make a current backup before opening the case.
2. Power off and unplug
   Shut down fully, switch off at the mains and disconnect the power cable and all other cables.
3. Ground yourself
   Touch a grounded metal object or use an anti-static strap before handling the modules or the logic board.
4. Open the case
   Follow the owner's manual for your machine. On the Mac mini (2018) this means removing the bottom cover, then the four Torx screws holding the metal RF shield over the memory slots.
5. Install the new memory
   Replace both SO-DIMMs with 260-pin PC4-21300 DDR4-2666 non-ECC unbuffered modules and clip them fully into place.
6. Close up
   Refit the RF shield and its four screws, then the bottom cover, and reconnect the cables.
7. Check the firmware and system see the new memory
   Switch on and confirm the new capacity is recognised before using the Mac again.

Good to know

• Apple's documentation and third-party teardowns disagree on whether the memory is user-installable; both positions are described above.
• Storage and CPU figures reflect the configurations Apple offered on this chassis; the 2 TB SSD and 10 Gb Ethernet were build-to-order options, not separate models.

Frequently asked questions

How much RAM can the Mac mini (2018) take?

Up to 64 GB in total, using two 32 GB modules. The platform does not support more than 32 GB per module.

What memory does the Mac mini (2018) use?

260-pin PC4-21300 DDR4-2666 SO-DIMMs, non-ECC and unbuffered. Two slots, both filled from the factory, so an upgrade replaces both modules.

Is the RAM user-installable?

Sources disagree. Apple's support page says the Mac mini (2018) does not have user-installable RAM and refers owners to an Apple Store or AASP, while teardowns and memory vendors document two ordinary SO-DIMM slots behind an RF shield. Owners do upgrade it themselves, but because Apple treats it as non-user-serviceable, keep the factory modules and reinstall them before any Apple repair.

Can I upgrade the SSD in the Mac mini (2018)?

No. The PCIe NVMe storage is soldered to the logic board and managed by the T2 chip, with no SATA or M.2 connectors. Capacity is fixed at purchase (up to 2 TB, build-to-order), and external Thunderbolt 3 storage is the only way to add space.

Can I upgrade the CPU or graphics?

No. The Coffee Lake processor is soldered to the board rather than socketed, and the Intel UHD 630 graphics are integrated. The i3-8100, i5-8500B and i7-8700B were fixed choices at purchase.

Does the Mac mini (2018) support ECC or registered memory?

Neither. It takes standard non-ECC, unbuffered SO-DIMMs; ECC and registered modules are neither supported nor required.

Official documents and references

• Apple — Mac mini (2018) technical specifications
  Official memory, storage and port options for this chassis.
• Apple — memory and service information for Mac mini (2018)
  Apple's statement that RAM is not user-installable.
• PDF Apple — Mac mini (2018) user guide (PDF)
  Owner's manual; use it for exact disassembly and handling.
• iFixit — Mac mini (Late 2018) teardown
  Photos of the SO-DIMM slots under the RF shield, and the soldered SSD and CPU.
• EveryMac — Mac mini (Late 2018) specs
  Capacity figures and confirmation that storage and CPU are not upgradeable.
• AppleInsider — 2018 Mac mini RAM and storage FAQ
  Module type, warranty caveat and configuration notes.