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| CPU | Intel® Celeron® J4125 quad-core   2.0 GHz processor (burst up to 2.7 GHz) | 
| CPU   Architecture | 64-bit   x86 | 
| Graphic   Processors | Intel®   HD Graphics 600 | 
| Floating   Point Unit | 
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| Encryption   Engine | (AES-NI) | 
| Hardware-accelerated   Transcoding | 
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| System   Memory | 4 GB   SO-DIMM DDR4 (1 x 4 GB) | 
| Maximum   Memory | 8 GB   (2 x 4GB) | 
| Memory Slot | 2 x   SO-DIMM DDR4 | 
| When installing two memory modules, please   ensure that they are the same size and ideally use the same type of RAM for   both memory slots. | 
| Flash   Memory | 4GB   (Dual boot OS protection) | 
| Drive Bay | 4 x   3.5-inch SATA 6Gb/s, 3Gb/s | 
| The system is shipped without HDD. | 
| For the HDD compatibility list, please   visit https://www.qnap.com/compatibility/ | 
| Drive   Compatibility | 3.5-inch   bays: | 
| 3.5-inch SATA hard disk drives | 
| 2.5-inch SATA hard disk drives | 
| 2.5-inch SATA solid state drives | 
| Hot-swappable | 
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| M.2   SSD Slot | Optional   via a PCIe adapter | 
| SSD   Cache Acceleration Support | Drive   bays 1 to 2 | 
| 2.5   Gigabit Ethernet Port (2.5G/1G/100M) | 2 | 
| Jumbo   Frame | 
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| PCIe   Slot | 1 | 
| Slot 1: PCIe Gen 2 x2 | 
| PCIe bandwidth limitations will restrict the   NAS 10GbE performance. | 
| USB   2.0 port | 2 | 
| USB   3.2 Gen 1 port | 2 | 
| USB   3.2 Gen 2 (10Gbps) Port | Optional   via a PCIe adapter | 
| HDMI   Output | 1,   HDMI 1.4b | 
| Form   Factor | 1U   Rackmount | 
| LED   Indicators | HDD   1-4, Status, LAN, Expansion, Power | 
| Buttons | Power,   Reset | 
| Dimensions   (HxWxD) | 43.3   × 482.6 × 508.7 mm | 
| Weight   (Net) | 8.12   kg | 
| Weight   (Gross) | 10.1   kg | 
| Operating   temperature | 0 -   40 °C (32°F - 104°F) | 
| Relative   Humidity | 5-95%   RH non-condensing, wet bulb: 27ËšC (80.6ËšF) | 
| Power   Supply Unit | 250W   (x2), 100-240V | 
| Power   Consumption: HDD Sleep Mode | 30.207   W | 
| Power   Consumption: Operating Mode, Typical | 45.3   W | 
| Tested with drives fully populated. | 
| Fan | 2 x   40mm, 12VDC | 
| Sound   Level | 37.5   db(A) | 
| System   Warning | Buzzer | 
| Max.   Number of Concurrent Connections (CIFS) | 1500 |