GMKtec
GMKtec M6 Ultra Gaming Mini PC Ryzen 7640HS
Bottom line: The GMKtec M6 Ultra Gaming Mini PC Ryzen 7640HS ($579.99 on Amazon as of 2026-10-06): 6 Zen 4 cores / 12 threads, 4.3 GHz base to 5.0 GHz boost; main trade-off: bundled 512GB SSD is PCIe 3.0, slower than the 4.0 second slot.
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*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
Pros & Cons
Pros
- ✓ 6 Zen 4 cores / 12 threads, 4.3 GHz base to 5.0 GHz boost
- ✓ 32GB dual-channel DDR5 preinstalled, expandable to 128GB
- ✓ Dual 2.5GbE NICs suit pfSense, Untangle or a home server role
- ✓ Triple output: 8K@60Hz over USB4 plus 4K@60Hz HDMI 2.0 and DP
- ✓ Second M.2 slot accepts PCIe 4.0 SSDs up to 8TB
Cons
- ✗ Bundled 512GB SSD is PCIe 3.0, slower than the 4.0 second slot
- ✗ Radeon 760M iGPU is rated for moderate gaming only
- ✗ 1-year limited warranty is short for a desktop purchase
- ✗ HDMI port is 2.0, so it caps at 4K@60Hz
Manufacturer description
The GMKtec M6 Ultra mini PC puts an AMD Ryzen 5 7640HS into a desktop small enough to mount behind a monitor. Six Zen 4 cores and 12 SMT threads run from a 4.3 GHz base to a 5.0 GHz boost inside a 45-60W TDP envelope, which GMKtec rates as roughly 30% faster than the older Ryzen 7 6800H. The integrated Radeon 760M brings 8 compute units and 512 shaders at up to 2,600 MHz, enough for moderate gaming at steady frame rates plus hardware encode and decode of AV1, HEVC and AVC. You get 32GB of dual-channel DDR5 (2x16GB SO-DIMM) expandable to 128GB, and a 512GB M.2 2280 PCIe 3.0 SSD with a second…
SpecPicks Verdict
SpecPicks scored GMKtec M6 Ultra Gaming Mini PC Ryzen 7640HS using a rating × review-volume × price-fit model applied to published specs and reviews across the home ai / computer lab category. GMKtec's home ai / computer lab lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for home ai / computer lab of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Frequently Asked Questions
Can the GMKtec M6 Ultra really drive three monitors at once?
Yes. GMKtec rates it for three simultaneous displays: 8K@60Hz through the USB4 port plus 4K@60Hz on both HDMI 2.0 and DisplayPort.
How much RAM and storage can I add later?
It ships with 32GB DDR5 as 2x16GB SO-DIMMs and supports expansion to 128GB. Storage is a 512GB M.2 2280 PCIe 3.0 SSD with a second slot that takes PCIe 4.0 drives up to 8TB. Upgrade parts are not included.
Is the Radeon 760M graphics good enough for gaming?
The 760M has 8 compute units and 512 shaders running up to 2,600 MHz, which GMKtec positions for moderate gaming at steady frame rates. It also hardware-encodes and decodes AV1, HEVC and AVC, so it doubles as a media box.
Can I use this as a pfSense or Untangle firewall?
That is one of GMKtec's stated use cases. Two 2.5G RJ45 NICs deliver up to 2500Mbps each, which is the dual-NIC layout pfSense, Untangle and small office server builds need.
What warranty and support come with it?
GMKtec includes a 1-year limited warranty from the purchase date covering defects in design and workmanship. Check the product listing for current warranty and return terms before buying.
Key Features
- VALUE & PERFORMANCE MINI PC - GMKtec Nucbox M6 Ultra Series is equipped with the powerful AMD Ryzen 5 7640HS processor. This CPU is an upper mid-range processor (APU) of the Phoenix product family. It has 6 SMT-enabled Zen 4 cores (12 threads) running at 4.3 GHz base speed to turbo boost 5.0 GHz.With a TDP Boost of 45W-60W, the Ryzen 7640HS CPU is more energy efficient and delivers a 30% Performance increase over previous AMD Ryzen 7 6800H, 6600U.
- 32GB DDR5 RAM & 512GB PCIe SSD - Installed with DDR5 32GB RAM SO-DIMM Dual Channel (2x16GB), the Nucbox M6 Ultra mini pc support expansion to 128GB RAM. Featured with 512GB M.2 2280 PCIe 3.0 SSD, support dual slot expansion to PCIe 4.0 8TB SSD. (Upgrades not included)
- GAMING PC - The Radeon 760M iGPU has 8 CUs (512 shaders) running at up to 2,600 MHz. This desktop computer can play moderate gaming at a steady FPS, it also HW-encodes and HW-decodes the most widely used video codecs such as AV1, HEVC and AVC.
- DUAL NIC LAN 2.5G RJ45 - Fast Network Speeds: Enjoy up to 2500Mbps data transmission speed without worrying about lagging. Ideal for working, gaming, and surfing the internet. Great for Untangle, Pfsense or as a server office PC.
- TRIPLE 4K DISPLAY - Unlock unparalleled productivity with support for three simultaneous displays, including a stunning 8K@60Hz via USB4, plus 4K@60Hz through both HDMI 2.0 and DisplayPort, transforming your workspace into a command center for multitasking and immersive entertainment.
- FAST INTERNET WiFi 6 + BT5.2 CONNECTION - Experience next-generation WiFi 6 for ultra-fast, low-latency internet on 2.5G/5G bands, paired with Bluetooth 5.2 for instant peripheral connections. BT5.2 allowing you more quickly to connect other wireless devices (headset, mouse, keyboard, etc.) Interface features 3*USB3.2 (Gen2) ports, 1*USB2.0 ports, 1*HDMI 2.0 port(4K@60Hz), 1*USB 4.0 port(PD/DP/DATA), 1*DP Port, 1*Audio 3.5mm (HP&MIC), 1*DC Power Port.
Full Specifications
| Brand | GMKtec |
|---|---|
| Color | Black(M6 Ultra) |
| Turbo | Yes |
| Weight | 2.5g |
| RAM Type | DDR5 RAM |
| CPU Model | AMD Ryzen 5 7640HS |
| CPU Speed | 4.5 GHz |
| Cache Size | 16 MB |
| Model Name | M6 Ultra |
| Model Year | 2025 |
| Resolution | 4096 × 2160 |
| Style Name | R5 7640HS |
| Unit Count | 1 Count |
| Screen Size | 75 inches |
| Aspect Ratio | 16:9 |
| Connectivity | Bluetooth, USB, WiFi |
| Display Type | External |
| Memory Speed | 4800 MHz |
| Model Number | M6 Ultra |
| Video Output | HDMI, DisplayPort |
| Full listing title | GMKtec M6 Ultra Gaming Mini PC Ryzen 7640HS (Upgraded 6600H/ 6800H), 32GB RAM DDR5 512GB SSD Dual NIC LAN 2.5GbE Desktop Computers Office Home, Triple 4K Display, WiFi 6, USB4, BT 5.2, DP, HDMI 2.0 |
Ready to buy?
GMKtec M6 Ultra Gaming Mini PC Ryzen 7640HS (Upgraded 6600H/ 6800H), 32GB RAM DDR5 512GB SSD Dual NIC LAN 2.5GbE Desktop Computers Office Home, Triple 4K Display, WiFi 6, USB4, BT 5.2, DP, HDMI 2.0 is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
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