GMKtec M6 Ultra
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The GMKtec M6 Ultra pairs an AMD Ryzen 5 7640HS with integrated Radeon 760M graphics in a case just over 5 inches square that weighs barely over a pound. It covers office productivity, light gaming, and content creation on a 6-core Zen 4 chip. Dual 2.5G Ethernet ports and a USB4 port with 100W Power Delivery handle connectivity, and both builds run dual-channel DDR5 across two SO-DIMM slots that accept up to 128GB.
Pros and cons
| Pros | Cons |
|---|---|
| Six Zen 4 cores and 12 threads boosting to 5.0 GHz | 49.6 dBA under load in the default Performance Mode |
| Dual 2.5G Ethernet ports for wired LAN redundancy | All-plastic chassis |
| USB4 40Gbps with 100W PD and DisplayPort Alt Mode | 6-core CPU trails 8-core rivals in multi-threaded tasks |
| Up to 128GB DDR5 RAM support across two SO-DIMM slots | Not recommended for Plex hardware transcoding |
| Clean Windows 11 Pro install with no bloatware | WiFi card faulted by owners, one of whom swapped in an AX210 |
| Two M.2 PCIe Gen 4 slots for up to 16TB storage | Budget-tier RAM and SSD brands inside |
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GMKtec M6 Ultra Comparison Chart
 GMKtec M6 Ultra | GMKtec M6 Ultra | GMKtec M6 Ultra | GMKtec M6 Ultra | |
| Price | List Price: $389.99 Amazon Prices: Loading prices... | List Price: $549.99 Amazon Prices: Loading prices... | List Price: $629.99 Amazon Prices: Loading prices... | List Price: $499.99 Amazon Prices: Loading prices... |
| Version | 16GB/512GB | 32GB/512GB | 32GB/1TB | 16GB/1TB |
| Performance Rating | 4.7 | 5.2 | 5.2 | 4.7 |
| Operating System | Windows 11 Pro | Windows 11 Pro | Windows 11 Pro | Windows 11 Pro |
| Processor | Hexa-core 4.30 Ghz (max 5.00 Ghz) AMD Ryzen 5 7640HS | Hexa-core 4.30 Ghz (max 5.00 Ghz) AMD Ryzen 5 7640HS | Hexa-core 4.30 Ghz (max 5.00 Ghz) AMD Ryzen 5 7640HS | Hexa-core 4.30 Ghz (max 5.00 Ghz) AMD Ryzen 5 7640HS |
| GPU | Integrated AMD Radeon 760M | Integrated AMD Radeon 760M | Integrated AMD Radeon 760M | Integrated AMD Radeon 760M |
| RAM | 16 GB DDR5 SO-DIMM, 2-channel | 32 GB DDR5 SO-DIMM, 2-channel | 32 GB DDR5 SO-DIMM, 2-channel | 16 GB DDR5 SO-DIMM, 2-channel |
| Internal Storage | 512 GB | 512 GB | 1 TB | 1 TB |
| Dimensions width x length x thickness | 5.04 x 5.04 x 1.89 inches (128.02 x 128.02 x 48.01 mm) | 5.04 x 5.04 x 1.89 inches (128.02 x 128.02 x 48.01 mm) | 5.04 x 5.04 x 1.89 inches (128.02 x 128.02 x 48.01 mm) | 5.04 x 5.04 x 1.89 inches (128.02 x 128.02 x 48.01 mm) |
| Weight | 1.12 lbs (0.51 kg) | 1.12 lbs (0.51 kg) | 1.12 lbs (0.51 kg) | 1.12 lbs (0.51 kg) |
| WiFi | Wi-Fi 6E (802.11ax) | Wi-Fi 6E (802.11ax) | Wi-Fi 6E (802.11ax) | Wi-Fi 6E (802.11ax) |
| Bluetooth | Bluetooth 5.2 | Bluetooth 5.2 | Bluetooth 5.2 | Bluetooth 5.2 |
| Ethernet | 2 Ethernet ports at 2.5 Gbps | 2 Ethernet ports at 2.5 Gbps | 2 Ethernet ports at 2.5 Gbps | 2 Ethernet ports at 2.5 Gbps |
| HDMI | 1 Full-Size HDMI Port | 1 Full-Size HDMI Port | 1 Full-Size HDMI Port | 1 Full-Size HDMI Port |
| DisplayPort | 1 DisplayPort (DisplayPort 1.4) | 1 DisplayPort (DisplayPort 1.4) | 1 DisplayPort (DisplayPort 1.4) | 1 DisplayPort (DisplayPort 1.4) |
| VGA | No VGA Ports | No VGA Ports | No VGA Ports | No VGA Ports |
| USB Ports | 1 USB 2.0, 3 USB 3, 1 USB-C (1 USB4) USB4 40Gbps with DP Alt Mode and 100W PD output, 3x USB 3.2 Gen 2 (10Gbps) | 1 USB 2.0, 3 USB 3, 1 USB-C (1 USB4) USB4 40Gbps with DP Alt Mode and 100W PD output, 3x USB 3.2 Gen 2 (10Gbps) | 1 USB 2.0, 3 USB 3, 1 USB-C (1 USB4) USB4 40Gbps with DP Alt Mode and 100W PD output, 3x USB 3.2 Gen 2 (10Gbps) | 1 USB 2.0, 3 USB 3, 1 USB-C (1 USB4) USB4 40Gbps with DP Alt Mode and 100W PD output, 3x USB 3.2 Gen 2 (10Gbps) |
| Thunderbolt Ports | No | No | No | No |
| OCuLink | No | No | No | No |
| Internal SATA Ports | No SATA ports | No SATA ports | No SATA ports | No SATA ports |
| Card Reader | No Card Reader | No Card Reader | No Card Reader | No Card Reader |
| Headphone Jack | combo | combo | combo | combo |
| Fanless | No | No | No | No |
| VESA Mount | Yes | Yes | Yes | Yes |
| In the Box | Mini PC, 120W power adapter with power cord, HDMI cable (1.5m), VESA mount bracket with screws, user manual, warranty card | Mini PC, 120W power adapter with power cord, HDMI cable (1.5m), VESA mount bracket with screws, user manual, warranty card | Mini PC, 120W power adapter with power cord, HDMI cable (1.5m), VESA mount bracket with screws, user manual, warranty card | Mini PC, 120W power adapter with power cord, HDMI cable (1.5m), VESA mount bracket with screws, user manual, warranty card |
| Expandability | RAM upgradable to 128GB via 2x DDR5 SO-DIMM slots, storage expandable via 2x M.2 2280 PCIe Gen 4 slots (up to 8TB each) | RAM upgradable to 128GB via 2x DDR5 SO-DIMM slots, storage expandable via 2x M.2 2280 PCIe Gen 4 slots (up to 8TB each) | RAM upgradable to 128GB via 2x DDR5 SO-DIMM slots, storage expandable via 2x M.2 2280 PCIe Gen 4 slots (up to 8TB each) | RAM upgradable to 128GB via 2x DDR5 SO-DIMM slots, storage expandable via 2x M.2 2280 PCIe Gen 4 slots (up to 8TB each) |
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Plastic outside, dual-channel DDR5 and Gen 4 storage inside
The dual-tone case measures 5.04 x 5.04 x 1.89 inches and weighs 1.12 pounds, so it sits in one hand and mounts behind a monitor with the included VESA bracket. The chassis is plastic, and NotebookCheck’s review calls the build quality “flawless” despite the low-cost materials. Cooling runs through two fans, one for the CPU and one for the system, which keeps thermals in hand at the cost of noise that becomes distracting during sustained workloads in the default Performance Mode.
The Ryzen 5 7640HS gives strong single-core results from its Zen 4 architecture, with six cores and twelve threads boosting up to 5.0 GHz. The integrated Radeon 760M graphics and their eight RDNA 3 compute units cover 4K video playback, light gaming at 720p to 1080p with reduced settings, and console emulation up to PlayStation 3 and Nintendo Switch levels according to Team Pandory’s testing. The chip runs at 35W in Quiet Mode or 50W in Performance Mode, and benchmark scores came out slightly higher at the lower power level in Elevated Systems’ testing, so the 35W setting costs nothing measurable in productivity work.
The front panel carries the USB4 40Gbps port with DisplayPort Alt Mode and 100W Power Delivery output, USB-A 3.2 ports, and a 3.5mm audio combo jack. The rear adds more USB-A, HDMI 2.0, DisplayPort 1.4, and the two 2.5G Ethernet ports, which suit a home lab or anything else that wants wired LAN redundancy. WiFi 6E comes from a MediaTek RZ616 card with Bluetooth 5.2, and owner reviews fault that card, which makes the wired ports the more dependable route. Storage sits in two M.2 2280 PCIe Gen 4 slots that take drives up to 8TB each.
Reviewer Insights
Lon.TV puts the graphics near a GTX 1050 Ti
Lon.TV presents the M6 Ultra as worth its price, particularly praising the $379 configuration with 32GB RAM. That build lists at $549.99. He notes that “graphically this little mini PC performs as well as an Nvidia GTX 1050 Ti” and appreciates that GMKtec “didn’t cripple this processor with single channel memory” by including proper dual-channel DDR5. His primary caveat concerns Plex servers, stating “I don’t recommend these though for Plex servers as Plex tends to prefer Intel based hardware for transcoding.” Overall, he considers it “a very decent little mini PC for its price point.”
Elevated Systems found the 35W cap solves the noise
Elevated Systems ran thermal and acoustic tests. The reviewer calls the M6 Ultra “the real sweet spot” where “Mini PCs start to offer serious performance without blowing past that value threshold.” On noise, “This thing gets loud under load. It’s one of the noisiest Mini PCs I’ve tested recently” at 49.6 dBA in Performance Mode. “dropping the CPU power cap to 35 watts [Quiet Mode]” takes noise down to 36.1 dBA while “the M6 Ultra actually scored slightly higher in quiet mode… hitting 7321 vs 7306 that it got in performance mode.” The review also highlights the clean Windows installation with no bloatware and the USB4 port’s 100W Power Delivery capability.
Team Pandory ran it through Cyberpunk and PS3 emulation
Team Pandory approaches the M6 Ultra from a gaming and emulation perspective, calling it “shockingly good” for $349. Their testing shows the M6 Ultra handling Cyberpunk 2077 at 720p with low settings near 60 FPS using FSR upscaling, while PS3 and Nintendo Switch emulation run smoothly. The teardown reveals dual-fan cooling with separate CPU and system fans, keeping temperatures between 75-80 degrees during gaming. They note the budget-tier component branding (MasonSemi RAM, AirDisk SSD) used to hit the price point but confirm “the M6 Ultra is a huge performance upgrade… it belongs in the same tier as perhaps the M7 and M7 Pro.” The main limitation compared to higher-end models is the absence of an OCuLink port for external GPU expansion.
NotebookCheck awarded 77% and called it “a robust mini PC with USB4 and great value for money.” TechRadar gave 4.5 out of 5 stars, praising the compact design and upgrade options. Wccftech gave it their Great Value Award and highlighted the 8W idle power consumption and comprehensive I/O selection.
Customer Reviews
Across 26 ratings on Amazon, the GMKtec M6 Ultra averages 4.3 stars, with 69% leaving five stars and 9% leaving one. Claudia Perdomo, a verified buyer, called it “surprisingly impressed with its performance for the size” and reported running modern games “smoothly at medium to high settings without overheating.” Stephen King, also verified, was pleased that “it only takes 22 seconds for the Windows desktop to appear after I turn it on.” Andrew Cink noted it “worked fine on windows 10 and 11,” though he disliked the external power brick.
Robert hedman gave it three stars and wrote that “The wifi card is garbage, drivers are not working, and the built in antennas are bad,” resolving it only by swapping in a new AX210 chip. GadgetGuru left a one-star review describing a unit that “loses the internet connection then crashes to a green screen” and seemed defective out of the box. Anthony Marquez hit a hardware fault too and singled out the support response as the “best tech support I’ve ever received,” getting an Amazon replacement within a month. If you buy one, test the WiFi early so you are still inside the return window. Read more owner reviews on Amazon.
A six-core value box for desk work and a home lab
Dropping the BIOS power cap from 50W to 35W is the first change worth making after setup. From there the M6 Ultra covers office work and light gaming, and the two 2.5G Ethernet ports plus 8W idle draw make it a reasonable always-on box for a home lab. Room for 128GB of DDR5 and a second Gen 4 M.2 drive means the configuration you buy is not the one you are stuck with.
Plex transcoding is better served by an Intel machine with QuickSync, and external GPU expansion needs the OCuLink port on the GMKtec M7 Ultra. Sustained multi-core work is where six cores give ground to eight-core boxes, and Starry Hope’s Mini PC Comparison Chart shows how those stack up on cores, ports, and memory ceilings.
Upgrades
Accessories that fit the GMKtec M6 Ultra's USB4 or Thunderbolt ports.
Core X V2
A Thunderbolt 5 enclosure that Razer lists as working with Thunderbolt 4 and USB4 hosts; it fits a four-slot card and needs an ATX power supply.
DEG2 eGPU Dock
Connects over USB4 or Thunderbolt 5, with an OCuLink input behind a switch, and adds an M.2 slot; it needs an ATX or SFX power supply.
Breakaway Box 850 T5
Has an 850W power supply built in, so only the graphics card is extra, and works with Thunderbolt 4 and USB4 Windows PCs.
TS4 Thunderbolt 4 Dock
An 18-port dock that CalDigit lists for Thunderbolt 4 and USB4 hosts, with 2.5GbE and a DisplayPort 1.4 output.
TBT4-UD5 Thunderbolt 4 Dock
Two HDMI ports drive two 4K60 monitors from one Thunderbolt 4 or USB4 port on a Windows PC.
Revodok Max 208 Thunderbolt 4 Dock
Adds three Thunderbolt 4 ports for dual 4K60 displays plus gigabit Ethernet; it has no HDMI port, so monitors connect over USB-C or an adapter.
Frequently Asked Questions
What processor does the GMKtec M6 Ultra use?
The M6 Ultra uses the AMD Ryzen 5 7640HS, a Zen 4 chip with 6 cores and 12 threads that boosts up to 5.0 GHz. Some sellers label it “Ryzen 7,” but the 7640HS is a Ryzen 5 part.
Can the GMKtec M6 Ultra run games?
The integrated Radeon 760M runs older and esports titles smoothly at 720p to 1080p with reduced settings, and Team Pandory measured Cyberpunk 2077 near 60 FPS at 720p on low with FSR upscaling. Lon.TV puts the graphics on par with an Nvidia GTX 1050 Ti.
How loud is the GMKtec M6 Ultra?
Elevated Systems measured 49.6 dBA under load in the default Performance Mode. Switching to Quiet Mode in the BIOS brings that to 36.1 dBA with essentially identical productivity performance, which makes Quiet Mode the better everyday default.
How much RAM can the M6 Ultra support?
The two SO-DIMM slots take up to 128GB of DDR5. Both builds ship dual-channel, starting at 16GB, and the slots are accessible inside the chassis for a later upgrade.
Is the M6 Ultra good for a home server?
Two 2.5G Ethernet ports, 8W idle power draw, and up to 16TB of storage across two M.2 slots cover most home server roles. Plex is the exception, since Lon.TV notes Plex prefers Intel hardware for transcoding.
What displays can the M6 Ultra drive?
It drives three displays at once, through HDMI 2.0, DisplayPort 1.4, and the USB4 port’s DisplayPort Alt Mode. That covers a multi-monitor desk or a signage setup.
Does the M6 Ultra have an OCuLink port?
The M6 Ultra has no OCuLink port. Team Pandory names it as the main gap against higher-end models, so anyone who wants an external graphics card should look at the GMKtec M7 Ultra, which includes OCuLink in a similar form factor.
What comes in the box with the M6 Ultra?
The box holds the mini PC, a 120W power adapter with power cord, a 1.5 meter HDMI cable, a VESA mounting bracket with screws, a user manual, and a warranty card.