| Model | [TS-855X-8G] QNAP TS-855X 8-Bay NAS |
| Form Factor | Tower |
| CPU | Intel ® Atom® C5125 8-core processor, 2.8GHz |
| System Memory | 8GB non-ECC UDIMM DDR4 (1 x 8 GB) |
| Maximum Memory | 128GB (4 x 32 GB) |
| Memory Slot | 4 x U-DIMM DDR4 Support ECC memory |
| Flash Memory | 5GB (Dual boot OS protection) |
| Drive Bay | 6 x 3.5-inch + 2 x 2.5-inch SATA 6Gb/s, 3Gb/s |
| Drive Compatibility | 3.5-inch bays: |
| 3.5-inch SATA hard disk drives | |
| 2.5-inch SATA solid state drives | |
| 2.5-inch bays: | |
| 2.5-inch SATA solid state drives | |
| Hot-swappable | Yes |
| M.2 Slot | 2 x M.2 2280 PCIe Gen 3 x4 slots |
| SSD Cache Acceleration Support | Yes |
| SR-IOV | Yes |
| 2.5 Gigabit Ethernet Port (2.5G/1G/100M) | 2 (2.5G/1G/100M/10M) |
| 10 Gigabit Ethernet Port | 1 x 10GBASE-T |
| 25 Gigabit Ethernet Port | Optional via PCIe expansion card |
| Wake on LAN (WOL) | Yes / Only the 2.5GbE port |
| Jumbo Frame | Yes |
| PCIe Slot | 2 |
| Slot 1: PCIe Gen 3 x4 | |
| Slot 2: PCIe Gen 3 x4 | |
| USB 2.0 port | 1 |
| USB 3.2 Gen 1 port | 3 |
| Supported RAID types | RAID 0, 1, 5, 6, 10, JBOD, Single Supported RAID Hot Spare and Global Hot Spare |
| LED Indicators | Power/Status, LAN, USB, HDD1-6, SSD 1-2, M.2 SSD 1-2 |
| Buttons | Power, Reset, USB Auto Copy |
| Dimensions (HxWxD) | 225 × 292.9 × 319.8 mm |
| Weight (Net) | 10.04 kg |
| Weight (Gross) | 10.04 kg |
| Warranty | 3 Years Carry-in |
