- CPU options
- Core i3-8100, Core i3-9100, Core i5-8400, Core i5-8500, Core i5-8500T, Core i5-9500, Core i5-9600, Core i7-8700, Core i7-8700T, Core i7-9700T, Core i9-9900T
- Form factor
- 1-liter business mini
- Memory
- DDR4-2666 SO-DIMM, non-ECC, 2 slots
- Max RAM (official)
- 32 GB — ServeTheHome ran 2x 32 GB SO-DIMMs (64 GB) in its M920x: https://www.servethehome.com/lenovo-thinkcentre-m920x-tiny-review-and-guide/
- Storage
- 2x M.2 2242/2280 PCIe NVMe SSD slots (RAID 0/1 via special-bid configs only), plus a 2.5-inch SATA bay. The bay is lost when a PCIe card (such as the RX 560) is installed.
- Ethernet
- 1 × 1 GbE (Intel I219-LM; Intel AMT 12.0 on vPro configurations. The PCIe slot also accepts Lenovo's I350-T4 quad-port NIC.)
- Wi-Fi
- M.2 Wi-Fi card slot; card and antennas optional (STH's unit had no antennas).
- vPro / AMT
- Some CPU options
- Cooling
- Fan-cooled
- Power adapter
- 135 W Lenovo notebook-style adapter (the only adapter listed in PSREF).
- Discrete GPU
- Optional AMD Radeon RX 560 4 GB GDDR5 (4x mini DisplayPort) on a PCIe 3.0 x8 riser; takes the 2.5-inch bay and the optional rear ports.
- Measured idle draw
- 29–34 W (ServeTheHome, 120 V, Core i5-8500T with the AMD Radeon RX 560 4 GB installed; expect much lower without the GPU.; source)
- Windows 11
- CPU generation is on Microsoft's supported list