The GMKtec NucBox M3 Ultra comes equipped with a 1TB NVMe SSD, offering fast storage access in a compact form factor. Its physical footprint is modest, measuring 114 mm wide, 106 mm thick, and 42.5 mm tall, which results in a total volume of 513.57 cm³ — keeping its desktop presence minimal without requiring significant desk space.
The processor carries a 45W TDP and features a hybrid core configuration running at 6 × 2.3 GHz and 8 × 1.7 GHz, with a turbo clock speed reaching up to 4.7 GHz via Turbo Boost version 3. It supports multithreading across 20 threads in total and is fully 64-bit compatible, while the clock multiplier is set at 23 and remains locked. Cache memory is distributed across three levels — 1200 KB of L1, 11.5 MB of L2, and 24 MB of L3 — and the CPU includes integrated graphics. The maximum rated CPU temperature sits at 100 °C.
The integrated graphics solution has a turbo clock of 1400 MHz and is built on a 10 nm semiconductor process, with PCIe 4 handling communication with the rest of the system. It supports up to four displays simultaneously and is compatible with DirectX 12, OpenGL 4.6, and OpenCL 3, covering a broad range of graphics and compute workloads without requiring a discrete card.
The system comes with 32GB of DDR4 RAM running at 3200 MHz, providing a solid base of memory bandwidth for everyday and multitasking workloads alike.
Wireless connectivity covers Wi-Fi 6 (802.11ax) along with backwards-compatible Wi-Fi 5 and Wi-Fi 4, paired with Bluetooth 5.2 for peripheral connections. On the wired side, the port selection includes three USB 3.2 Gen 2 Type-A ports, one USB 3.2 Gen 2 Type-C port, and one USB 2.0 Type-A port, though there are no USB 3.2 Gen 1, USB 4, Thunderbolt, or RJ45 ports present. Display output is handled through two HDMI ports, with no DisplayPort or VGA connector available. A 3.5 mm headset jack is included for audio, while S/PDIF output is not supported.
In benchmark testing, the processor scores 26,130 in PassMark multi-threaded and 3,582 in the single-threaded PassMark test. Cinebench R20 results follow a similar pattern, with a multi-threaded score of 7,170 and a single-threaded result of 694, reflecting the CPU's threading efficiency relative to its per-core output.
The system uses a laptop-class CPU that employs big.LITTLE technology for mixed-core operation, and it supports the NX bit for hardware-level memory protection. The integrated GPU is the Iris Xe Graphics with 96 execution units, and the processor supports a range of instruction sets including SSE 4.1, SSE 4.2, AVX, AES, FMA3, F16C, and MMX. Memory can be configured across two channels and scaled up to a maximum of 64GB, with RAM speeds supported up to 5200 MHz, though ECC memory is not supported and there is no external memory slot available.
