MINISFORUM UM870 Slim Review: A Quiet 8-Core Mini PC That Docks Over USB4
The UM870 Slim is a small, near-silent desktop for office work, programming and light gaming, built around an 8-core Ryzen 7 8745H with 32GB of upgradable DDR5 and a real USB4 port that carries video and power over one cable. It stays cool and quiet in normal use, ships with Windows already installed and licensed, and its two SO-DIMM and two M.2 slots leave room to grow. The trade-offs are the plastic chassis, the MediaTek wireless module that has no Linux driver, and the single USB-C port sitting on the back. For a compact always-on machine or a tidy desk PC it is strong value; if you need several fast USB-C ports or an aluminium case, look higher up the range.
- Home offices
- Programming and light gaming
- Compact desks
- Linux users who swap the Wi-Fi card
Pros
- 8-core, 16-thread Ryzen 7 8745H with a 65W performance profile
- 32GB of dual-channel DDR5-5600 across two upgradable SO-DIMM slots, up to 96GB
- Two M.2 2280 PCIe 4.0 slots with 1TB fitted, each up to 4TB
- USB4 at 40Gbps carrying video and power over one cable
- HDMI 2.1 and DisplayPort 1.4 for up to three displays
- 2.5G Ethernet plus Wi-Fi 6E and Bluetooth
- Quiet in normal use and low idle power draw
- Windows preinstalled and licensed
- VESA mount, HDMI cable and adapter in the box
- Two-year warranty
Cons
- Plastic chassis with no aluminium option
- MediaTek Wi-Fi and Bluetooth module has no Linux driver
- Only one USB-C port, and it is on the rear
- Two rear USB 2.0 ports feel dated
- No SD card slot, fingerprint reader or Thunderbolt
- Very bright blue front power LED
- Large external power brick
Who is the MINISFORUM UM870 Slim for?
This is a mini PC for people who want a quiet, small machine that still behaves like a full desktop. Owners describe using it for office apps, browsers, photo editing, coding and everyday multitasking without slowdown, and several run a second operating system on the spare M.2 slot. The 8-core, 16-thread Ryzen 7 8745H and 32GB of DDR5 make that comfortable, while the integrated Radeon 780M handles lighter gaming at 1080p and even titles like Hogwarts Legacy at reduced settings. Its small footprint, low idle power draw and near-silent running make it a natural fit for a desk or for mounting behind a monitor with the included VESA bracket.
What the UM870 Slim offers
The core is an AMD Ryzen 7 8745H, an 8-core, 16-thread Zen 4 part that boosts to 4.9GHz with a 65W performance profile and no neural engine. It pairs with 32GB of DDR5-5600 in two dual-channel SO-DIMM slots that can be upgraded to 96GB, and 1TB of NVMe storage in one of two M.2 2280 PCIe 4.0 slots, each able to take a 4TB drive. The headlining port is USB4 at 40Gbps, which carries a display signal and can also take power over the same cable, so a suitable USB-C monitor or dock can drive the screen and cut the cable count. For displays there is also HDMI 2.1 at up to 8K60 and DisplayPort 1.4, giving up to three screens. Networking is a single 2.5G Ethernet port plus Wi-Fi 6E and Bluetooth, and there are two front USB 3.2 Type-A ports, two rear USB 2.0 ports and a 3.5mm audio jack, all in a 0.82 litre, 130 x 127 x 50 mm chassis cooled by a phase-change layer, three copper heat pipes and a large fan.
What to know before you buy
The main caveat is wireless on Linux: the MediaTek Wi-Fi and Bluetooth module has no working Linux driver, and buyers who run a Linux distribution often order a supported Intel wireless card at the same time, switching the internal M.2 module under the SSD. On Windows everything works out of the box and Windows is preinstalled and licensed. The chassis is plastic rather than aluminium, which keeps the price down but does not feel premium, and the bright blue power LED is bright enough that owners tape over it. Ports are a mixed bag: there is only one USB-C port and it is on the rear, the front has no USB-C at all, and the two rear USB 2.0 ports feel dated. There is no SD card slot, no fingerprint reader, no Thunderbolt certification and no built-in speakers or microphone, and the external power brick is larger than some would like. The USB4 port's power input also does not work with every monitor, so the bundled adapter is still the reliable way to power it.
Is the MINISFORUM UM870 Slim worth it?
For the money, the UM870 Slim trades materials and a long port list for performance, quietness and upgrade headroom that few machines this size offer. The two memory and two storage slots mean it can grow rather than be replaced, and the USB4 port makes a single-cable desk setup possible. What you give up is aluminium, extra USB-C ports, an SD reader and out-of-the-box Linux wireless, so a buyer who wants those should expect to pay more elsewhere or budget for a supported Wi-Fi module. As a compact, quiet desktop for work, coding and casual gaming, it is a sensible pick, backed by a two-year warranty and VESA mounting in the box.
Frequently asked questions
Does the MINISFORUM UM870 Slim come with Windows?
Yes. The configured trims ship with Windows preinstalled and licensed, and owners confirm the key is stored in the BIOS so recovery is straightforward. The barebone kit is sold without memory, storage or an operating system.
Can the MINISFORUM UM870 Slim run Linux?
Yes, and owners run it successfully, but the built-in MediaTek Wi-Fi and Bluetooth module has no Linux driver. Plan to fit a supported module such as an Intel AX210 in the internal M.2 wireless slot, or use Ethernet, because Wi-Fi and Bluetooth will not work out of the box.
How much memory and storage can the UM870 Slim take?
It ships with 32GB of DDR5-5600 in two dual-channel SO-DIMM slots and supports up to 96GB. Storage is 1TB in one of two M.2 2280 PCIe 4.0 slots, each of which can take a drive up to 4TB.
Can the UM870 Slim drive multiple monitors?
Yes. It has HDMI 2.1, DisplayPort 1.4 and a USB4 port that also outputs video, which together drive up to three independent displays.
Does the MINISFORUM UM870 Slim have Thunderbolt?
No. Its Type-C port is USB4 and is not certified Thunderbolt, so Thunderbolt-specific docks and devices are not guaranteed to work.
Does the UM870 Slim have an SD card slot or a fingerprint reader?
No. Its ports are USB, Ethernet, HDMI, DisplayPort, USB4 and a 3.5mm audio jack, with no card reader, fingerprint sensor or security lock slot.
