QNAP TS 873 4G

Ordering P/N : TS-873-4G 
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
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 SODIMM 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 : 8 x 2.5-inch or 3.5-inch

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 : Yes
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
SSD Cache Acceleration Support : Yes

Gigabit Ethernet Port (RJ45) : 4 ( Expandable with an optional PCIe adapter)
10 Gigabit Ethernet Port : Optional via a PCIe adapter

PCIe Slot : 2 x PCIe Gen 3 (x4)
USB 3.0 port : 4
USB 3.1 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 speaker, 1 x 3.5 mm line-out jack
Form Factor : Tower
LED Indicators : Status/Power, USB, LAN, Drive 1-8, M.2 SSD 1-2
Buttons : Power, Reset, USB Auto Copy
Dimensions (HxWxD) : 188.2 × 329.3 × 279.6 mm
Weight (Net) : 6.56 kg
Weight (Gross) : 8.34 kg

Power Supply Unit 250W, 100-240V AC, 50-60Hz, 3.5A
Power Consumption: HDD Sleep Mode 36.43 W