Mac Mini 2018 Intel i7 — Quick Specs Summary
| Component | Specification | Upgradeable? |
|---|---|---|
| Processor | Intel Core i7-8700B (6-core, 3.2–4.6 GHz, Intel UHD 630) | No |
| RAM | 8GB, 16GB DDR4 SO-DIMM (2 slots, max 64GB) | Yes — UPGRADEABLE to 32GB/64GB |
| Internal SSD | 128GB–512GB M.2 NVMe (replaceable in some configs) | Partially — depends on configuration |
| Ports | 4× USB-A 5Gbps, HDMI 2.0, 2× Thunderbolt 3, Gigabit Ethernet | No |
| Wireless | WiFi 5 (802.11ac), Bluetooth 5.0 | No |
| Power Supply | 90W external PSU | No |
| Display Outputs | HDMI 2.0 + 2× TB3 (4K 60Hz max) | N/A |
| Price (used) | £250–350 (with 8GB/256GB base) | N/A |
The 2018 i7: The Only Truly Upgradeable Mac Mini
Why This Model Matters
This is the last Mac Mini with user-replaceable RAM (before Apple switched to soldered Apple Silicon). It’s the holy grail for users who want upgrade flexibility.
Performance in 2024
The i7-8700B is now 6 years old but remains practical:
- 6 cores / 12 threads at up to 4.6 GHz (Intel Boost)
- Outperforms base M1 in single-threaded tasks; loses to M2/M4
- Handles 1080p video, light 4K, standard development work
- Good for servers (macOS Server, media server, NAS roles)
Gap vs M4: ~30–40% slower overall; comparable single-threaded performance.
RAM Compatibility & Upgrades
DDR4 SO-DIMM: The Game Changer
The 2018 i7 has 2× DDR4 SO-DIMM slots (laptop-style, not full-size DIMM). This means:
- Factory config: 8GB (2× 4GB) or 16GB (2× 8GB)
- Maximum upgrade: 32GB (2× 16GB SO-DIMM)
- High-end upgrade: 64GB (2× 32GB SO-DIMM, if future modules exist)
Upgrade Path (Step-by-Step)
- Identify current RAM: Open System Report → Memory. Note capacity and module count.
- Purchase DDR4 SO-DIMM modules: Crucial, Kingston Fury, G.Skill brands. Specs: DDR4-3200, CAS Latency 22, 1.2V (laptop-grade).
- Back up your Mac.
- Power down, unplug power cord for 30+ seconds.
- Remove Mac Mini bottom (8× pentalobe screws).
- Locate RAM slots (two adjacent slots under logic board).
- Eject current modules (push clips outward), insert new modules at 45° angle, press down until clicks.
- Reassemble, boot up, verify in System Report.
Recommended RAM Upgrades
| Upgrade Path | Cost | Best For |
|---|---|---|
| 8GB → 16GB (2× 8GB DDR4-3200) | £40–60 | General use, development, light video editing |
| 8GB → 32GB (2× 16GB DDR4-3200) | £80–120 | Professional video/3D, virtualisation, Docker fleets |
| 16GB → 32GB (2× 16GB DDR4-3200) | £80–120 | Upgrade from factory 16GB config |
Compatibility Notes
Always use DDR4 SO-DIMM (laptop form factor), not full-size DDR4 DIMMs. Speed: 3200 MHz is standard; 2400 MHz also works (negotiates down). Avoid mixing module speeds/brands if possible.
Top-rated DDR4 SO-DIMM upgrades:
- Crucial DDR4-3200 16GB — reliable, widely compatible
- Kingston Fury Impact DDR4-3200 — high-performance
- G.Skill Ripjaws DDR4 — excellent value for money
SSD & Storage
SSD Replacement: Configuration-Dependent
The 2018 i7’s SSD situation is murky:
- Some units (especially 256GB/512GB models): Use replaceable M.2 NVMe (can upgrade)
- Other units (especially 128GB base): SSD is soldered (not user-replaceable)
Check before purchasing used: Ask if the 128GB SSD is soldered or removable. If you want SSD upgradeability, target 256GB+ models.
If Your SSD Is Replaceable
Upgrade path:
- Purchase M.2 NVMe SSD (see options below)
- Power down, unplug, remove bottom panel
- Locate M.2 slot (usually mid-board)
- Eject SSD (push at 45°), insert new drive, press down until seated
- Reinstall macOS or clone existing drive via external Thunderbolt SSD
Compatible M.2 NVMe SSDs for Mac Mini i7 (2018):
- Samsung 970 EVO Plus — excellent speed, widely compatible
- Kingston Fury Beast Pro — high-performance NVMe
- Crucial P5 Plus — reliable budget-friendly option
If Your SSD Is Soldered
You must use external Thunderbolt 3 SSDs for expansion. Popular fast options:
- Samsung T7 (500GB–2TB) — fast TB3 compatible SSD
- OWC Mercury Extreme Pro — Mac-optimized external drive
- Thunderbolt 3 NVMe Enclosure — pair with any M.2 drive
Not ideal but workable for expanding total system storage.
Power Supply & Thermal Considerations
External 90W PSU
The 2018 i7 uses a 90W external power adapter (vs USB-C on newer models). If your unit is used and the PSU fails, replacement adapters are available (£40–80). Always buy OEM or certified third-party (Sonnet, OWC, etc.).
Cooling Under Upgrade
Upgrading to 32GB RAM + increased workload doesn’t create thermal issues (RAM isn’t a heat source). Cooling remains the same as stock config. Monitor temps during sustained workloads (video export); the i7 can run warm at full boost (70–85°C, normal for Intel).
Ports & Display Support
Thunderbolt 3 (Legacy)
The 2018 i7 has 2× TB3 ports (vs 3–4 on modern models). This is still useful for external SSDs and displays, though TB3 docks are less common now than TB4. Modern TB4 docks provide backward compatibility:
- CalDigit TS4 — TB4 dock, backward-compatible with TB3 at 40 Gbps speeds
Display Output
Supports:
- HDMI 2.0 (4K 60Hz max)
- 2× 4K displays via TB3 (or 1× 5K via single TB3 + HDMI)
Multi-display setups are possible but require TB3 adapters/docks (less common).
WiFi & Bluetooth
WiFi 5 vs WiFi 6E
The 2018 i7 has WiFi 5 (802.11ac), not modern WiFi 6. Real-world speeds: 250–350 Mbps in typical offices. For heavy file transfers, use Gigabit Ethernet (included) or Thunderbolt external SSD.
Bluetooth 5.0 Compatibility
Works fine with modern Bluetooth peripherals (AirPods, Beats, external mice/keyboards). No compatibility issues.
Upgradeability Score
| Category | Score | Notes |
|---|---|---|
| RAM Upgrade | 9/10 | User-replaceable SO-DIMM; can reach 32GB/64GB |
| SSD Upgrade | 6/10 | Replaceable on 256GB+ models; soldered on 128GB base |
| Ports & Connectivity | 6/10 | 2× TB3, 4× USB-A, HDMI; workable but older standards |
| Display Support | 6/10 | 4K via HDMI + TB3; good but not cutting-edge |
| Overall Upgradeability | 8/10 | BEST Mac Mini for upgradeable RAM; reasonable SSD path |
Frequently Asked Questions
Is the 2018 i7 worth buying used in 2024?
Yes, if price is £250–300 and you plan RAM upgrades. Excellent for servers, virtualisation labs, or budget builds. Avoid if seeking cutting-edge performance (M4 is faster).
What’s the maximum RAM I can fit?
Theoretically 32GB (2× 16GB DDR4 SO-DIMM). Future 32GB SO-DIMM modules may push to 64GB, but not yet widely available. Plan for 32GB as practical maximum now.
Can I replace the SSD myself?
Yes, if your model uses replaceable M.2 NVMe (256GB+). The 128GB base model likely has soldered storage. Confirm before buying used.
What RAM brands are compatible?
DDR4 SO-DIMM from Crucial, Kingston Fury, G.Skill, Corsair are standard. Avoid off-brand; ensure CAS Latency 22 and 1.2V (laptop-spec DDR4). Test after install using System Report.
Will upgrading RAM void my warranty?
Likely no, but check your specific unit. AppleCare+ may not cover RAM upgrade costs if you damage components. Do the upgrade carefully; take a photo before disassembly.
Recommended Products
These are the products we recommend based on this guide. All links go to Amazon UK where you can check current prices and availability.
| Product | Why We Recommend It | Amazon UK |
|---|---|---|
| Corsair Vengeance DDR4 SO-DIMM 32GB (2×16GB) 3200MHz | Best overall DDR4 upgrade kit | View on Amazon UK |
| Kingston Fury Impact DDR4 SO-DIMM 32GB (2×16GB) 3200MHz | Reliable alternative with tight latency | View on Amazon UK |
| Crucial DDR4 SO-DIMM 16GB 3200MHz | Budget single-stick upgrade | View on Amazon UK |
| Samsung DDR4 SO-DIMM 32GB 3200MHz | OEM-quality for business laptops | View on Amazon UK |
| Samsung 990 Pro 2TB NVMe M.2 2280 | Fastest consumer NVMe — ideal for gaming & editing | View on Amazon UK |
| WD Black SN850X 2TB NVMe | Excellent Gen4 speed with heatsink option | View on Amazon UK |
| Crucial P5 Plus 1TB NVMe | Great value Gen4 SSD | View on Amazon UK |
| Kingston NV2 1TB NVMe | Budget-friendly with solid reliability | View on Amazon UK |
Prices and availability may vary. As an Amazon Associate, we earn from qualifying purchases.
