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The Minisforum EM780 is the smallest way to put a Ryzen 7 7840U and a Radeon 780M on a desk, and it only makes sense if that specific size is the requirement rather than a nice-to-have; the rest of the ultra-compact mini PC class is built on the same bargain. Inside 80 × 80 × 43 mm and about 238 g sit an 8-core Zen 4 processor, a 12-CU Radeon 780M, 32 GB of LPDDR5-6400 and one replaceable M.2 2230 SSD.
What separates it from a conventional Ryzen mini PC is infrastructure rather than computing power. Memory is soldered with a 32 GB ceiling, storage stops at a single 2230 slot with no SATA bay, there is no OCuLink, and there is no RJ45 port anywhere on the chassis. Wired networking arrives through a bundled USB-C adapter, which is fine on a desk and uncomfortable on an unattended server.
At the wall, the machine holds its configured 28 W with package temperatures in the mid-80 °C range and no measurable loss of sustained clocks, which is the result that makes the size defensible. The useful question for 2026 is not whether a 7840U is fast enough, it is what fixed 32 GB, one SSD and USB-attached Ethernet mean for Plex, Proxmox and Home Assistant duty.
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| Component | Minisforum EM780 |
|---|---|
| CPU | AMD Ryzen 7 7840U, Phoenix, Zen 4, 8 cores / 16 threads, 3.3 GHz base, up to 5.1 GHz boost |
| Power envelope | 15–30 W configurable range, configured around 28 W sustained |
| iGPU | Radeon 780M, RDNA 3, 12 compute units, up to 2.7 GHz |
| Media engine | Hardware H.264, HEVC/H.265 and AV1 encode and decode |
| Memory | 32 GB LPDDR5-6400, soldered, not upgradeable |
| Storage | 1 × M.2 2230 PCIe 4.0 x4 NVMe, user-replaceable; microSD/TF slot |
| Wired network | None on chassis; bundled USB-C adapter, reported as 2.5GbE in one region and Gigabit in another |
| Wireless | Wi-Fi 6E, Intel Killer AX1675w-class module in the reviewed unit; Bluetooth 5.3 per current official spec |
| USB | 2 × USB4 40 Gbps Type-C with DisplayPort, 3 × USB-A 3.2 Gen 2 |
| Video output | HDMI 2.1 plus both USB4 ports, up to three displays |
| Audio | 3.5 mm combo jack |
| Power input | 65 W USB-C PD, 20 V / 3.25 A |
| Cooling | Cold Wave 2.0: CPU blower with liquid-metal interface, separate bottom fan for the SSD |
| Dimensions | 80 × 80 × 43 mm, roughly 0.25 L, about 238 g |
| Mounting | No native VESA provision listed |
| BIOS (current) | 1.05 |
Quick verdict: the EM780 is a credible pocket-sized Jellyfin or Proxmox node and the smallest chassis that runs this processor without throttling. It is the wrong machine for anyone who needs upgradeable memory, native Ethernet, more than one internal drive, or OCuLink.
EM780: Overview
Minisforum showed the Mercury EM780 at Computex on June 2, 2023, before naming a price or a shipping date, then took until December 29, 2023 to sell the first units in China. International retail followed in January 2024 with two configurations, both carrying 32 GB of LPDDR5-6400 alongside either a 512 GB or a 1 TB SSD. Minisforum's own material also references a 16 GB machine, though regional listings overwhelmingly document the 32 GB versions, and no barebone EM780 was clearly retailed.
The Mercury chassis itself comes from the EM680, which uses the same 80 × 80 × 43 mm enclosure, soldered LPDDR5 and a single 2230 SSD slot. Moving from the EM680's Ryzen 7 6800U and Radeon 680M to the EM780's Zen 4 7840U and Radeon 780M raises the CPU and media ceiling without changing a single expansion option. There is no 0.25 L successor to the EM780 in the current Minisforum range, which moves up to larger UM and MS chassis from here.
Availability is the practical snag. The EM780 is sold out at Minisforum with no formal end-of-life notice, so a 2026 buyer is looking at remaining third-party stock rather than a current product line.
Specs & What's in the Box
The box holds the 80 mm chassis, a 65 W USB-C PD supply rated at 20 V / 3.25 A, and, in at least some regions, a USB-C networking accessory. That adapter carries the machine's only wired connection. Both regional bundles have shipped under the same product name, with the accessory identified as Realtek 2.5GbE in one market and as Gigabit Ethernet in another, so wired speed depends on what is in the box you receive.
Powering the PC over USB-C also costs a port. Unless a monitor or dock supplies USB Power Delivery, one of the two USB4 ports is occupied by the power supply, leaving the second USB4 port and three USB-A 3.2 Gen 2 ports for peripherals. Both USB4 ports carry DisplayPort, and with HDMI 2.1 the chassis drives up to three displays.
Wireless is Wi-Fi 6E, with an Intel Killer AX1675w-class module in the reviewed unit. Minisforum treats the wireless as onboard rather than as a standard user-swappable card, and later official documentation lists Bluetooth 5.3 where some earlier reviews list 5.2. Mounting follows the same appliance logic: Minisforum does not list native VESA points, so a ventilated shelf, tray or third-party cradle is the realistic rack option.
Build Quality & Durability
At roughly 238 g the EM780 is dense rather than hollow, and the cooling hardware explains why. Cold Wave 2.0 puts a blower and a liquid-metal interface over the CPU, then adds a second bottom fan assembly dedicated to the SSD, which is what keeps sustained read performance from sliding as the drive heats up.
That secondary SSD fan is also the most repeated ergonomic complaint. Owners describe it running frequently despite modest absolute noise, and one user reported roughly a 10 °C SSD temperature penalty after disconnecting it, which is a good reason to leave the fan alone rather than silence it.
Serviceability is narrow by design. The 2230 SSD is replaceable and there is a microSD slot, but the LPDDR5 is soldered and storage stops at one drive with no second bay, no SATA and no OCuLink. Firmware is still supported in 2026 through BIOS 1.05; early samples shipped with 1.02 and 1.03 appeared on owner systems in 2024, but Minisforum has not published a changelog mapping revisions to fixes, so attributing a USB4, fan or power-restore behaviour to a specific BIOS version is guesswork.
Two owner reports matter for unattended deployments, and only as anecdotes: a USB4 port that failed after about two months and was replaced through the retailer, and a Secure Boot configuration that became awkward to change after a firmware state change until the NVMe drive was removed. Coil whine and VRM overheating show up in isolated reports rather than as repeating model-wide patterns.
Performance: CPU, Media Engine and 24/7 Homelab Duty
A 28 W Phoenix chip in a 0.25 L box
The Ryzen 7 7840U is a Zen 4 part with 8 cores, 16 threads, a 3.3 GHz base clock and up to 5.1 GHz boost, inside AMD's 15–30 W configurable envelope. Minisforum configures the EM780 around 28 W, and the chassis sustains that target: CPU package temperatures sit in the mid-80 °C range under full load with no measurable drop in sustained clocks. The Radeon 780M adds 12 RDNA 3 compute units at up to 2.7 GHz and draws on the same LPDDR5-6400 as the CPU, which is why the soldered memory is fast on paper and still no substitute for a socket.
Power and noise
Idle draw at the wall runs about 10.2 to 11.6 W, averaging near 10.9 W, which is high for an N100 appliance and normal for an 8-core Zen 4 machine. Average load lands around 31.7 W, Cinebench R23 multi-core about 47.7 W, and Prime95 between 48.5 and 55 W, averaging 51.6 W. Gaming loads sit lower than the synthetic peaks, with FurMark and a Witcher 3 run both landing in the low 40s of watts.
Noise follows the same shape: roughly 30.1 to 30.4 dB(A) idle, about 32.2 dB(A) under moderate load, and 37.9 to 38 dB(A) at maximum. Those figures are respectable for the volume, though dB(A) numbers from different setups are not directly comparable without the measurement distance, ambient floor and workload, and they say nothing about the tonal character that drives owner complaints about the small SSD fan.
Media transcoding: Jellyfin first, Plex with caveats
The Phoenix media engine handles hardware H.264, HEVC and AV1 encode and decode, and AMD rates the silicon for up to 4K/175 fps H.264 and H.265 encoding and 4K/240 fps AV1 encoding, which are silicon-level maxima rather than application promises. On Linux, current VA-API and FFmpeg paths expose that engine to Jellyfin, which makes Jellyfin the easier platform to build a server around; on Windows the equivalent path is AMF.
Plex handles AMD hardware transcoding on an as-is basis, and HDR tone mapping is where expectations need calibrating: depending on the OS, the Plex build, the container and the client, tone mapping can fall back to software and the load moves onto the CPU. No stream count is guaranteed by this hardware, because throughput swings with source bitrate, tone mapping, subtitle burn-in, codec and target resolution. 1080p hardware transcodes are the comfortable case, 4K HDR tone-mapped jobs are the limit, and the Plex hardware requirements explain why the codec chain matters more than core count.
Virtualization, Home Assistant and headless reality
Eight Zen 4 cores and 32 GB of RAM are enough for a light to medium Proxmox node with a handful of containers and one or two VMs, and Phoenix supports AMD-V and IOMMU for device assignment. The ceiling is what it is: 32 GB is the end of the road, the single 2230 SSD carries every guest, and IOMMU grouping and iGPU passthrough are not documented for this specific model, so passthrough work is experimentation rather than a supported feature. Home Assistant sits comfortably inside the compute and power budget, and the same missing Ethernet port follows the box everywhere.
That missing port is the real headless problem. With no onboard RJ45, Ethernet-based Wake-on-LAN is unavailable from the chassis, and one owner reported the BIOS power-on-after-AC-loss option not behaving as expected, which is exactly the setting an unattended server depends on. As a NAS host the EM780 is a poor fit for the same reason: one internal 2230 drive and no SATA bays push bulk storage onto USB enclosures, with the bridge-chip, disk-identity and disconnection caveats that make for a bad primary pool. A dedicated NAS plus the EM780 as a compute node is the coherent architecture.
Linux is no longer a blocker in itself. Ubuntu-family distributions, Linux Mint and Bazzite have all run on the platform, and the remaining friction sits in specific places: Secure Boot configuration, AMD media stack versions, USB4 peripherals and passthrough details.
USB4 expansion without OCuLink
Both USB4 ports can drive an external GPU, and an external GPD G1 was run over USB4 on this chassis. Enclosure compatibility is the variable, with one owner unable to get a TH3P4G3 enclosure working while another USB4 implementation ran, which is normal behaviour for AMD USB4 rather than a defect. There is no OCuLink host port, so direct PCIe expansion is off the table entirely.
EM780 vs GMKtec K8 Plus: Head-to-Head
The K8 Plus is the sharpest comparison for a homelab buyer, because it keeps a Radeon 780M-class Ryzen in an under-one-litre chassis while restoring nearly everything the EM780 removed.
| Minisforum EM780 | GMKtec K8 Plus | |
|---|---|---|
| CPU | Ryzen 7 7840U, 8C/16T, ~28 W configured | Ryzen 7 8845HS, 8C/16T, vendor range up to 54 W |
| iGPU | Radeon 780M, 12 compute units | Radeon 780M, 12 compute units |
| Memory | 32 GB LPDDR5-6400, soldered | 2 × DDR5-5600 SO-DIMM, vendor-rated to 128 GB |
| Storage | 1 × M.2 2230 PCIe 4.0 x4 | 2 × M.2 2280 PCIe 4.0 x4 |
| Wired network | None onboard; bundled USB-C adapter | 2 × 2.5GbE |
| External PCIe | None, USB4 only | OCuLink PCIe 4.0 x4 |
| USB | 2 × USB4 40 Gbps, 3 × USB-A 3.2 Gen 2 | 2 × USB4 40 Gbps |
| Displays | HDMI 2.1 plus 2 × USB4 | HDMI 2.1 plus DisplayPort |
| Dimensions | 80 × 80 × 43 mm, ~0.25 L | 132 × 125 × 58 mm, ~0.96 L |
| Power input | 65 W USB-C PD | 120 W DC |
Roughly four times the volume buys socketed memory with a far higher ceiling, two full-length 2280 NVMe slots, dual 2.5GbE, OCuLink for an external GPU or adapter, a conventional DC brick instead of USB-C PD, VESA support and explicit Linux backing from the vendor. The EM780 answers with the same 12-CU Radeon 780M and the same AV1 media engine in a quarter-litre box, and it is the machine to choose when the 80 mm footprint is the whole point rather than one factor among several.
Recommended Upgrades / Best Accessories
The upgrade list for an EM780 is short because the platform is closed. Memory is soldered, so there is no RAM upgrade at any capacity, OCuLink adapters do not apply, and with no listed native VESA interface, display-arm mounting goes through a cradle or tray.
Storage is the one genuinely useful change. Owners replace the factory 2230 drive after reporting sustained-write weakness, and the slot accepts a single M.2 2230 PCIe 4.0 NVMe drive, so capacity and endurance matter more than peak sequential figures:
- Sabrent Rocket Q4 2230 2 TB, installed successfully by an EM780 owner.
- WD_BLACK SN770M 2 TB, a physically and electrically compatible 2230 alternative.
For USB4 work, swap the bundled USB-C cable for a fully featured Cable Matters USB4 40 Gbps cable if you plan to run a display, a dock or an external GPU, since at least one owner found the included cable carried power but not video.
A compact Anker 715 Nano II 65 W matches the 20 V / 3.25 A profile the EM780 expects, provided the cable is rated for 5 A. Note that USB4 eGPU enclosures are not interchangeable: controller, dock firmware and cable decide whether a card enumerates, and results differ between enclosures.
→ Check the MINISFORUM EM780 on Amazon
Who Should Buy the EM780?
The EM780 belongs in three roles. The first is a Jellyfin or Plex compute node living next to separate storage, where hardware transcoding, low idle draw and enough CPU for the surrounding stack matter more than bays, and the missing Ethernet is solved by the bundled adapter. The second is a small Proxmox host running containers and a couple of modest VMs, as long as 32 GB is accepted as permanent. The third is a desktop machine: three displays, a 780M that handles emulation and older titles, and USB4 for an external GPU later.
It is the wrong machine for four other jobs. As a primary NAS it has one 2230 slot and no SATA. As a router or firewall it has no native Ethernet and one bundled USB adapter, which cannot provide physical WAN and LAN separation without VLAN trickery. As a growth platform it has nowhere to go on memory. And as a general-purpose homelab box, the size premium only pays off if sub-0.3 L is a hard requirement.
If the footprint is negotiable but the silicon class is not, the GMKtec K8 Plus, the Beelink SER8, a GEEKOM A8 or Minisforum's own UM780 XTX deliver the same Radeon 780M generation with socketed memory and native wired networking. Inside Minisforum's lineup, the UM870 Slim is the closer fit for a permanent node that does not need to be pocket-sized.
Conclusion & Final Verdict
The Minisforum EM780 does one thing no competing machine does: it puts an 8-core Ryzen 7 7840U, a 12-CU Radeon 780M and 32 GB of fast memory into about a quarter of a litre, and it holds its 28 W configuration there without throttling. Measured against that target, the compromises are the point rather than defects. Soldered memory, one 2230 SSD, no SATA, no OCuLink and no RJ45 are what the footprint costs.
For a homelab reader, the deciding question is whether the box is a node or a server. As a compute or media node attached to a NAS, with Jellyfin doing the transcoding and Proxmox handling a light VM load, the EM780 is efficient, quiet enough and genuinely small. As a standalone server that must boot unattended after a power cut, or as anything that needs to grow, it runs out of headroom quickly.
Buy it if sub-0.3 L is a requirement and 32 GB is enough forever. Skip it if you need native dual Ethernet, socketed RAM or more than one internal drive; a slightly larger 780M machine covers those for the same silicon generation.
Related reading: Mini PC for Homelab: Complete Starter Guide, Best Mini PC for Proxmox, Mini PC for Ubuntu: Picks & Setup Guide, Best Mini PC for HTPC & Home Theater, and the Minisforum UM760 review if you want the same platform thinking in a chassis with room to expand.
