| CPU | AMD R-Series RX-421ND quad-core 2.1 GHz processor (Turbo Core to 3.4 GHz) |
| CPU Architecture | 64-bit x86 |
| Graphic Processors | Optional via a PCIe adapter |
| Floating Point Unit | |
| Encryption Engine | (AES-NI) |
| Hardware-accelerated Transcoding | Optional via a PCIe adapter |
| System Memory | 4 GB SO-DIMM DDR4 (2 x 2 GB) |
| Maximum Memory | 64 GB (4 x 16 GB) |
| Memory Slot | 4 x SO-DIMM DDR4 For dual- or quad-DIMM configurations, you must use a pair of identical DDR4 modules. |
| Flash Memory | 512 MB (Dual boot OS protection) |
| Drive Bay | 4 x 3.5-inch SATA 6Gb/s, 3Gb/s |
| Drive Compatibility | 3.5-inch SATA hard disk drives
2.5-inch SATA hard disk drives
2.5-inch SATA solid state drives |
| Hot-swappable | The following are not hot-swappable: M.2 SSDs, SSD cache drives, SSDs using PCIe expansion slots. |
| M.2 SSD Slot | 2 x M.2 2280/2260 SATA 6Gb/s slots The M.2 SSD is not included as standard. M.2 SSD operations can easily generate excessive heat. It is recommended to install a heatsink (from QNAP or a third-party provider) on the M.2 SSD. |
| SSD Cache Acceleration Support | |
| Gigabit Ethernet Port (RJ45) | 4 Expandable with an optional PCIe adapter |
| 10 Gigabit Ethernet Port | Optional via a PCIe adapter |
| Jumbo Frame | |
| PCIe Slot | 2
Slot 1: PCIe Gen 3 x4
Slot 2: PCIe Gen 3 x4 |
| USB 3.2 Gen 1 port | 4 |
| USB 3.2 Gen 2 (10Gbps) Port | Optional via a PCIe adapter |
| IR Sensor | (QNAP RM-IR004) |
| HDMI Output | Optional via a PCIe adapter |
| Audio Input | 2 x 3.5 mm dynamic microphone jacks |
| Audio Output | 1 x built-in speaker, 1 x 3.5mm line out jack (for amplifiers or speakers) You cannot use the speakers and the line-out jack simultaneously. |
| Form Factor | Tower |
| LED Indicators | Status/Power, USB, LAN, Drive 1-4, M.2 SSD 1-2 |
| Buttons | Power, Reset, USB Auto Copy |
| Dimensions (HxWxD) | 188.2 × 199.3 × 279.6 mm |
| Weight (Net) | 4.9 kg |
| Weight (Gross) | 6.05 kg |
| Operating temperature | 0 - 40 °C (32°F - 104°F) |
| Relative Humidity | 5-95% RH non-condensing, wet bulb: 27?C (80.6?F) |
| Power Supply Unit | 250W, 100-240V AC, 50-60Hz, 3.5A |
| Power Consumption: HDD Sleep Mode | 33.24 W |
| Power Consumption: Operating Mode, Typical | 56.23 W Tested fully populated with 2TB hard drives. |
| Fan | System fan: 1 x 120mm
CPU fan: 1 x 60mm |
| Sound Level | 21.7 db(A) |
| System Warning | Buzzer |
| Kensington Security Slot | |
| Max. Number of Concurrent Connections (CIFS) | 1200 |
