MINISFORUM NAB9 Plus Mini PC with Intel Core i9 12900HK(14C/

The Verdict

Here’s the thing about the MINISFORUM NAB9 Plus: it’s a tiny box with a big engine and a questionable cooling system. The i9-12900HK is a laptop-class processor that Intel designed for beefy gaming laptops with vapor chambers and aggressive fan curves. MINISFORUM shoehorned it into a 4.6-inch aluminum cube. The result is a machine that benchmarks like a beast for the first ten minutes, then settles into a thermal reality that you need to understand before spending your money.

What You Actually Get

The box includes the NAB9 Plus unit itself (about 1.2 pounds), a 120W DC power adapter, an HDMI cable, a VESA mount plate with screws, and a basic manual. No keyboard, no mouse, no Windows license — you’re installing your own OS. The chassis is CNC aluminum with a brushed top panel and a magnetic snap-on lid that reveals the internals.

Port-wise, the front offers a USB-C (data only, 10Gbps), two USB 3.2 Gen2 Type-A, and a 3.5mm combo jack. The rear has two 2.5G Ethernet ports (Realtek RTL8125BG), HDMI 2.0, DisplayPort 1.4, and two more USB 3.2 Gen2. That’s a solid I/O spread for a home office or homelab setup — you can run dual 4K displays at 60Hz or bond the NICs for a NAS.

Performance and the Elephant in the Room

The 12900HK with 14 cores and 20 threads is genuinely fast for productivity. Cinebench R23 multi-core scores land around 15,000-16,000 in short bursts, which beats most desktop i5s from a few generations ago. Single-core is snappy at over 1,800. For compiling code, running VMs, or crunching spreadsheets with 100k rows, this thing flies.

But here’s where the 3.4-star average starts making sense. Push all 14 cores for more than a few minutes — say, a video export or a long compile — and the thermals kick in. The single 80mm fan ramps to a noticeable whine, and the CPU pulls back to a sustained ~35W instead of the 45W+ it wants. Users report throttling down to base clocks (2.5 GHz) under sustained AVX loads. One verified buyer wrote: “It’s fast for 5 minutes, then it sounds like a jet taking off and performance drops by about 30%. I had to undervolt to make it usable.”

This isn’t a dealbreaker if your workload is bursty. But if you’re expecting sustained i9 performance from a box this size, you’ll be disappointed.

What Buyers Consistently Praise

The positives in reviews cluster around three things:

• Compact power: “I replaced my full ATX tower with this for software development. It handles my Docker containers and builds without breaking a sweat. The size difference is incredible.”
• Port selection: Multiple reviewers specifically call out the dual 2.5G Ethernet as a reason to buy — great for pfSense, Proxmox, or a home server.
• Upgradeability: “Popped the lid, added 64GB of RAM and two 2TB NVMe drives in under 10 minutes. No proprietary nonsense.”

Where It Falls Short

The quality control issues are real. Out of 170 ratings, a meaningful chunk report dead-on-arrival units, Wi-Fi module failures (the Intel AX210 drops connections), and a persistent electrical whine from the power delivery. The 3.4 average is pulled down by these failures, not just thermal complaints.

Also, don’t buy this for gaming. The Iris Xe graphics are fine for 4K video playback and light photo editing, but anything 3D will chug. You’re paying for CPU, not GPU.

Who Should Buy This

• Homelab enthusiasts: The dual 2.5G NICs, low idle power (~10W), and 64GB RAM ceiling make it a great Proxmox or TrueNAS host.
• Developers with bursty workloads: Compiling, testing, and light virtualization. Just accept the fan noise.
• Office users who want desktop-class speed in a tiny footprint: If you’re coming from a 5-year-old i5 tower, this will feel like a massive upgrade.

Skip it if you need sustained multi-core performance, silence, or any gaming capability.

FAQ

Q: Can I upgrade the RAM and storage? A: Yes. Two SODIMM slots support up to 64GB DDR4-3200, and you get two M.2 2280 PCIe 4.0 slots. No 2.5" drive bay, so all storage is NVMe.

Q: Does it support dual 4K monitors? A: Yes, via HDMI 2.0 and DisplayPort 1.4 simultaneously. Both run at 60Hz. The USB-C port does support DP-alt mode, but it’s wired to the same display output as the HDMI, so you’re limited to two total.

Q: Is the fan always loud? A: At idle, it’s near-silent (~28dB). Under moderate load, it’s audible but tolerable (~35dB). Under sustained full load, it hits 45dB+ and sounds whiny. Undervolting via BIOS helps significantly.

The Verdict

Buy it if you need serious CPU power in a tiny package for bursty workloads, want dual 2.5G networking, and don’t mind a bit of fan noise. This is a niche tool, not a general-purpose family PC.

Skip it if you need sustained performance, quiet operation, gaming capability, or can’t afford to gamble on quality control. The 3.4-star average reflects real issues that MINISFORUM hasn’t fully ironed out.

Rating: 3.3/5 — A powerful, well-connected mini PC held back by thermal limitations and inconsistent build quality. It earns its score honestly: great on paper, frustrating in practice for some, excellent for the right user.

Where to Buy

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.