MINISFORUM Mercury Series EM780

Updated on May 27, 2026

The MINISFORUM Mercury Series EM780 is one of the smallest full-power mini PCs ever shipped: an 80mm-square box, about a quarter the footprint of a typical mini, running an AMD Ryzen 7 7840U with Radeon 780M graphics and 32GB of LPDDR5. It is aimed at people who want a real 8-core machine they can carry in a pocket, and reviewers were struck first by the size and second by how much performance Minisforum fit inside it.

The compromises are the ones you make for that size. The RAM is soldered, storage is a single M.2 2230 slot rather than a full-length drive, and there is no built-in Ethernet jack (a USB-C adapter is in the box). Note that this model has been superseded; it is documented here for owners and for the used market.

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MINISFORUM Mercury Series EM780 Comparison Chart

	MINISFORUM Mercury Series EM780	MINISFORUM Mercury Series EM780
Price	List Price: $799.90 Amazon Prices: Check Price on Amazon	List Price: $769.90 Amazon Prices: Check Price on Amazon
Version	32GB/1TB/AMD Ryzen 7 7840U	32GB/512GB/AMD Ryzen 7 7840U
Performance Rating	8.6	8.6
Operating System	Windows 11 Home	Windows 11 Home
Processor	Octa-core 3.30 Ghz (max 5.10 Ghz) AMD Ryzen 7 7840U	Octa-core 3.30 Ghz (max 5.10 Ghz) AMD Ryzen 7 7840U
GPU	Integrated AMD Radeon 780M	Integrated AMD Radeon 780M
RAM	32 GB	32 GB
Internal Storage	1 TB	256 GB
Dimensions width x length x thickness	3.15 x 3.15 x 1.69 inches (80.01 x 80.01 x 42.93 mm)	3.15 x 3.15 x 1.69 inches (80.01 x 80.01 x 42.93 mm)
Weight	unknown	unknown
WiFi	Wi-Fi 6E (802.11ax)	Wi-Fi 6E (802.11ax)
Bluetooth	Bluetooth 5.3	Bluetooth 5.3
Ethernet	1 Ethernet port at 1 Gbps	1 Ethernet port at 1 Gbps
HDMI	1 Full-Size HDMI Port	1 Full-Size HDMI Port
DisplayPort	Available over USB 4	Available over USB 4
VGA	No VGA Ports	No VGA Ports
USB Ports	3 USB 3, 2 USB 4, 1 USB-C USB 4 supports DisplayPort and power delivery	3 USB 3, 2 USB 4, 1 USB-C USB 4 supports DisplayPort and power delivery
Thunderbolt Ports	No	No
OCuLink	No	No
Internal SATA Ports	No SATA ports	No SATA ports
Card Reader	microSD Card Reader	microSD Card Reader
Headphone Jack	combo	combo
Fanless	No	No
VESA Mount	No	No
In the Box	Mini PC, HDMI cable, 65W GAN Type-c Power Adapter, Power Cable, Manual, USB Type-C Power Delivery Adapter, USB-C ethernet adapter with pass-through	Mini PC, HDMI cable, 65W GAN Type-c Power Adapter, Power Cable, Manual, USB Type-C Power Delivery Adapter, USB-C ethernet adapter with pass-through
Expandability	Storage is user upgradable with an M.2 SSD 2230 size, Expandable via USB hubs and included adapters	Storage is user upgradable with an M.2 SSD 2230 size, Expandable via USB hubs and included adapters

Key features and specifications

At 3.15 x 3.15 x 1.69 inches (an 80mm square), the EM780 is roughly a quarter the footprint of a standard mini PC. Inside is an AMD Ryzen 7 7840U: eight cores, 16 threads, a 5.1GHz boost clock, and Radeon 780M integrated graphics. The 32GB of LPDDR5 (running at 6400 MT/s) is soldered to the board, so the only user-serviceable upgrade is the single M.2 2230 NVMe slot, which takes drives up to 2TB.

For ports the EM780 carries two USB4 ports (with DisplayPort and power delivery), three USB 3.2 Gen 2 Type-A ports, a full-size HDMI 2.1 output, a microSD reader, and a 3.5mm combo jack. Wireless is Wi-Fi 6E and Bluetooth 5.3. There is no Ethernet jack on the chassis; Minisforum includes a USB-C to Ethernet adapter for wired networking. Cooling is the company’s Cold Wave 2.0 liquid-metal system with an SSD heatsink, which reviewers credited for keeping a 28W chip in check (more on temperatures below).

How the EM780 performs

For an 80mm box, the EM780 posts numbers close to a full-size 7840U mini. Reviewers measured Cinebench R23 multi-core around 12,200 to 12,800 (Retro Game Corps 12,217, Tek Syndicate 12,784) and Geekbench 6 multi-core near 9,900 to 10,300. The Radeon 780M handles 1080p gaming with the usual integrated-GPU caveats: ETA Prime recorded 84 FPS in Forza Horizon 5 and 88 FPS in GTA V, with Cyberpunk 2077 reaching about 73 FPS only with FSR on low; at medium settings Tek Syndicate saw Cyberpunk closer to 40 FPS and Baldur’s Gate 3 around 37. Gardiner Bryant, who set it up as a Steam machine, measured roughly 126 FPS in Doom Eternal at 1080p low and found Windows and Linux (ChimeraOS) within a few frames of each other.

Thermals are the standout for the size. The chip runs at a 28W limit, and reviewers saw load temperatures around 72 to 74C (ETA Prime measured about 72C average while gaming, Tek Syndicate 74C max), with idle power as low as 6W. The fans are the compromise: they are tiny, and Tek Syndicate measured roughly 83 dB at close range under the turbo profile. Storage is the single M.2 2230 slot, and the 32GB of LPDDR5-6400 is soldered.

What reviewers found

ETA Prime

ETA Prime called it a contender for “my favorite mini PC of 2024” and said he was “very surprised by what this little thing can do.” He was most impressed by the cooling, noting “our average temps are around 72° C” while gaming at 1080p, and his two-word verdict was simply “this thing is awesome.”

Retro Game Corps

Russ at Retro Game Corps led with the size, his “first impressions right off the bat is just how small this thing is,” and credited Minisforum with taking “a lot of care and attention into making sure that it kept cool and quiet.” He measured Cinebench R23 multi-core at 12,217 and called the EM780 “the one to beat,” while flagging that the RAM “is going to be soldered right onto the board, so you’re not going to be able to upgrade it.”

Tek Syndicate

Tek Syndicate summed it up as “small and fast” and “ridiculously portable,” suggesting it would be “really, really easy to take with you from home to the office.” His benchmarks (Cinebench R23 12,784, 74C under load) lined up with the others. His one real gripe was acoustic: the tiny fans make a “high-pitch noise… [that] is not pleasant” under turbo, though he added that in normal use “it’s so quiet that it almost doesn’t matter.”

Gardiner Bryant

Gardiner Bryant reacted to the size first (“holy crap, this thing is small dude”) and then put it to work as a Steam machine, testing it on both Windows and Linux. He measured around 126 FPS in Doom Eternal at 1080p low, found the two operating systems within a few frames of each other, and called the EM780 “awesome,” noting how quiet it stays.

Level1Techs

Level1Techs framed it as “an entire computer” in a quarter-liter, useful for small-footprint roles like remote access or “as part of a kiosk.” For anyone leaning on the Radeon 780M he recommended sticking with the dual-channel memory configuration, and he welcomed the bundled USB-C Ethernet adapter while noting its power pass-through was not always reliable.

Who should consider the EM780?

The EM780 is for one specific want: a genuinely pocketable computer that still runs a full 8-core Ryzen 7 7840U. If desk space or true portability is the priority, almost nothing else this small matches its performance, and it stays cool and reasonably quiet during ordinary work. A capable little box like this also makes a workable base for an offline AI survival computer.

The reasons to look elsewhere are the size compromises: soldered RAM, a single short M.2 2230 slot, Ethernet only through an adapter, and small fans that get loud under sustained load. It has also been discontinued and replaced; the larger Minisforum UM790 Pro is the current equivalent and is easier to expand. To compare other options, see Starry Hope’s Mini PC Comparison Chart.