MLLSE Mini PC M5 with i5-8257U, 16GB and WiFi 6: Full Review 2026

The MLLSE Mini PC M5 is a solid choice for users looking for a compact, quiet, and affordable computer for office tasks, browsing, and multimedia.

Its combination of 16GB of dual-channel DDR4 RAM and a 512GB SSD makes it smooth for everyday use, although the i5-8257U processor, released in 2018, is starting to fall behind the new low-power chips of 2024-2025.

Conclusion in 3 lines:

If you're looking for a quiet mini PC for work, watching shows, and managing files, the M5 more than delivers. It doesn't have the latest processor, but the 16GB of dual-channel RAM makes a big difference in everyday use. For gaming or very demanding tasks, consider newer options.

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📦 Unboxing and Box Contents

Upon opening the MLLSE M5 box, the finish is surprisingly high for its price range. The contents include:

• 🖥️ Mini PC MLLSE M5

• 🔌 Power adapter (12V DC)

• 📺 Cable HDMI

• 🔩 VESA mount for attaching to the back of the monitor

• 📘 User manual (in English and Chinese)

The computer comes with Windows 11 Pro pre-installed and activated, so you can get it up and running in minutes.

🔧 Technical Specifications

🎨 Design and Construction Quality

The MLLSE M5 boasts a minimalist design in matte black, with a high-density plastic casing that conveys solidity without the coldness of premium aluminum. Its size is comparable to a paperback book, making it one of the most discreet mini PCs on the market. The side vents are well-placed to optimize airflow, and the power button has a firm feel with soft white LED backlighting.

The included VESA mount is a very practical feature: you can install it directly behind your monitor and keep your desk completely clear. Overall, the design is functional and discreet, ideal for office or living room environments.

🖥️ Screen and Multimedia

The MLLSE M5 supports up to two simultaneous monitors via HDMI and DisplayPort, with a maximum resolution of 4K at 60Hz. For streaming Netflix, YouTube, or Plex in 1080p or 4K, performance is completely smooth thanks to the Intel Iris Plus hardware decoding.

Audio is handled via the 3.5mm audio jack output or via HDMI/DP directly to displays with speakers. It does not include built-in speakers, which is common in this category.

⚙️ Performance and Software

The Intel Core i5-8257U is an 8th generation (Whiskey Lake) processor with 4 cores, 8 threads, and Turbo Boost frequencies up to 3.9 GHz. Thanks to 16 GB of dual-channel RAM, the computer handles multitasking smoothly: you can have 20+ tabs open in Chrome, Office 365, Zoom, and Spotify simultaneously without any system lag.

Windows 11 Pro comes pre-installed and activated, without any invasive bloatware, which is a big plus. Windows updates work normally, and the system boots in about 15-20 seconds from the SSD.

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📊 Estimated performance in benchmarks:

Estimated values ​​based on equivalent hardware and public benchmarks of the i5-8257U.

🔋 Energy Consumption

The i5-8257U has a TDP of 28W, which puts it above the newer N-series chips (6-15W), but it's still very efficient compared to a traditional desktop PC. Under normal use (browsing, office applications), power consumption hovers around 12-18W, rising to 25-28W under maximum load. The included adapter is compact and doesn't take up much space on the power strip.

It does not include an internal battery, so it always depends on electrical current, as is usual in this category.

🌡️ Temperature and Noise (Actual Thermal)

The active cooling system (internal fan) keeps the processor at around 55-70°C under sustained load, according to tests with similar hardware.

The fan is audible at maximum load but remains virtually silent in normal use, making it ideal for work or living room environments.

No thermal throttling problems have been reported in everyday use.

🔌 Connectivity and Extras

The MLLSE M5 stands out for offering very complete connectivity for its size:

• 📶 WiFi 6 (802.11ax): Faster and more stable connections than WiFi 5

• 🔵 Bluetooth 5.3: Compatible with modern headphones, keyboards, and mice

• 🌐 Gigabit Ethernet RJ45: Ideal for stable wired connections

• 🔌 USB 3.0 x2 + USB 2.0 x2 + USB-C: Enough ports for common peripherals

• 📺 HDMI + DisplayPort: Dual monitor support up to 4K

• 🎧 3.5mm jack for headphones or speakers

❌ Does not include fingerprint reader, NFC or IP certification.

🔧 Expansion and Upgrades

One of the great advantages of the MLLSE M5 is its expandability:

• 💾 RAM: Two SO-DIMM DDR4 slots, expandable up to 32 GB (2x16 GB)

• 💿 Main SSD: M.2 2242 SATA3 slot (replaceable)

• ⚡ Secondary SSD: M.2 PCIe 4.0 x4 2280 slot available for adding a second high-speed drive

• ❌ It does not have an additional 2.5" HDD/SSD bay

This makes it a very flexible option: you can start with the basic configuration and expand according to your needs without changing equipment.

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🆚 Comparison with Direct Competitors

💡 Reflection: The MLLSE M5 competes directly with the Beelink SEi8 in price and performance. However, models like the Minisforum UN100 or MLLSE G2 Pro offer more modern and efficient CPUs for significantly less money. The M5's advantage lies in its two M.2 slots and WiFi 6.

💬 Reviews in Stores and Forums

This is perhaps the most valuable section of any review: what do people who actually use it say? We've analyzed comments from AliExpress, Reddit, YouTube, and Facebook groups to give you an honest, unfiltered view.

🛒 AliExpress — The Most Direct Source

MLLSE's official AliExpress store has garnered thousands of reviews across its product line, and the brand has received over 100,000 positive reviews in the last six months, with a very low return rate. Similar models in the MLLSE catalog have an average rating of around 4.6 out of 5 stars.

The most frequent comments from verified buyers on AliExpress are:

👍 What they value most:

• "It arrived perfectly packaged and earlier than expected." — Buyer from Spain

• "Windows 11 Pro comes pre-installed and activated; you just plug it in and it works."

• "It's surprising how smoothly it runs for its price; I have 20 tabs open and it doesn't even flinch."

• "Ideal as a home server and HTPC. It doesn't overheat, it's silent, perfect."

• "The dual M.2 slots are a big plus; I installed a second SSD without any problems."

👎 What they criticize:

• Some users point out that reviews on AliExpress are sometimes lacking in detail: generic comments like "nice product" or "I hope it works well" that don't provide real technical information.

• The virtual keyboard is set to Chinese by default on the first boot, although it can be changed in the initial setup wizard.

💬 Reddit — The Most Honest Opinion

In subreddits like r/MiniPCs and r/homelab, users are noticeably more critical and technical than in stores, making them a very valuable source.

Regarding the MLLSE brand in general, Reddit users highlight:

"The price for the specs is incredible, and the reviews on AliExpress are quite positive. However, that's where the available information ends." — r/homelab user

This highlights an important point: MLLSE is a brand that doesn't yet have the same independent media coverage as Beelink or Minisforum, which generates some initial distrust among advanced users. However, those who do take the plunge and buy it are usually satisfied.

Compared to similar models in the MLLSE catalog with equivalent hardware:

"Overall, it's a very nice unit, offering much more performance, capacity, and expansion options than any SBC (Single Board Computer) at the same price." — r/MiniPCs

Regarding the switch to mini PCs in general (very representative of the M5 buyer profile):

"It boots up much faster than my laptop. It stays pretty quiet even when multitasking. The temperatures are stable. The size is amazing—it literally fits in the palm of your hand." — r/MiniPCs

One point of concern mentioned by some users regarding AliExpress mini PCs is the possibility of coil whine (a slight electrical buzzing sound) in some units, although this is usually a one-off manufacturing defect, not a widespread problem with the model.

📺 YouTube — Video Reviews

There is a specific video on YouTube dedicated to the MLLSE Mini PC M5 with i5-8257U, published in February 2026. YouTube reviewers who have analyzed mini PCs with the i5-8257U agree on the following points:

• ✅ More than enough performance for office work and multimedia

• ✅ Ultra-fast boot time thanks to the M.2 SSD

• ✅ Very low noise level in everyday use

• ⚠️ The fan is audible under maximum load, although it is not annoying.

• ⚠️ For video editing or modern gaming, the integrated Iris Plus 640 GPU falls short

👥 Facebook — User Groups

In Facebook groups specializing in mini PCs and home automation, users particularly value the MLLSE M5 as a server for Home Assistant and Proxmox:

"It works perfectly. More than enough to run Home Assistant. I'm actually running a Proxmox setup with HA installed as a virtual machine." — Home Assistant Group, Facebook

This use as a lightweight 24/7 home server is one of the use cases where the i5-8257U shines especially, thanks to its low power consumption and stability under moderate continuous load.

📊 User Sentiment Summary

🧪 Technical Tests

Based on public benchmarks of the Intel Core i5-8257U and equivalent hardware:

🏃 Productivity performance:

• Microsoft Office 365 (Word, Excel, PowerPoint): fluido y sin lag

• Google Chrome with 15 tabs + YouTube 4K: no frame drops

• Zoom/Teams HD video conferencing: seamless

• Compilation of small web projects (Laravel, Node.js): acceptable

🎨 Creative performance:

• Photoshop (basic photo editing): fluid

• DaVinci Resolve (1080p video): slow, not recommended.

• 4K video editing: not recommended

🌐 Storage:

• SATA M.2 SSD Speed: ~500 MB/s read / ~450 MB/s write

• With PCIe SSD in second slot: up to 3,500 MB/s (depending on the installed model)

🎮 Gaming and Emulation

With its  integrated Intel Iris Plus 640 graphics, the MLLSE M5 isn't designed for demanding modern gaming, but it offers a decent experience in certain scenarios:

🕹️ For retrogaming and classic emulation, the M5 is a very capable option thanks to its 16 GB of RAM that avoids bottlenecks.

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❓ Frequently Asked Questions (FAQ)

❓ Is the i5-8257U sufficient in 2026?
For office tasks, browsing, and multimedia, absolutely yes. For professional video editing or modern gaming, there are more up-to-date alternatives.

❓ Can I upgrade the RAM?
Yes, up to 32 GB DDR4 with two 16 GB SO-DIMM modules.

❓ Can I add a second SSD?
Yes, it has a second M.2 PCIe 4.0 x4 slot available to install another SSD.

❓ Does it work with Linux?
The i5-8257U has excellent compatibility with Ubuntu, Debian, and other popular distributions.

❓ How many monitors does it support?
Up to 2 simultaneous monitors via HDMI + DisplayPort.

❓ Does it have a warranty?
MLLSE offers a warranty through its official AliExpress store. It is recommended to purchase from the MLLSE EU Store for greater coverage.

🏁 Final Conclusion

The MLLSE Mini PC M5 is an honest and functional option for a very specific type of user: someone who needs a compact, quiet, and reliable PC for working from home, browsing the web, streaming content, or emulating retro games. Its strength lies in its generous configuration of 16 GB of dual-channel RAM, a 512 GB SSD, WiFi 6, and dual M.2 drives, which sets it apart from many cheaper competitors.

However, the 2018 i5-8257U processor is its Achilles' heel in 2026: devices like the Minisforum UN100 or the MLLSE G2 Pro with more modern Intel N-series chips offer greater energy efficiency and performance in AI tasks for a considerably lower price.

👤 Who is it ideal for?

• ✅ Offices and light teleworking

• ✅ HTPC (multimedia center connected to TV)

• ✅ Retro emulation and casual gaming

• ✅ Lightweight home server (NAS, Plex, Pi-hole)

• ❌ Not recommended for video editing, 3D design, or AAA gaming

🛒 Where to buy it?

You can purchase the MLLSE Mini PC M5 at the following stores with international shipping:

👉 Buy on AliExpress (Official Offer) — Approximate price: ~€255

💡 Tip: Take advantage of AliExpress discount coupons during the 11/11 and Super Sale campaigns to get up to 15% extra savings.