QNAP TS-451D2-2G 4Bay NAS,Intel J4025 Dual Core 2.0GHz,2GB RAM

CPUIntel® Celeron® J4025 dual-core 2.0 GHz processor (burst up to 2.9 GHz)CPU Architecture64-bit x86Graphic ProcessorsIntel® HD Graphics 600Floating Point Unit
Encryption Engine (AES-NI)Hardware-accelerated Transcoding
System Memory2 GB SO-DIMM DDR4 (1 x 2 GB)Maximum Memory8 GB (2 x 4GB)Memory Slot2 x SO-DIMM DDR4

For dual-DIMM configuration, you must use a pair of identical DDR4 modules.

Flash Memory4GB (Dual boot OS protection)Drive Bay4 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 Compatibility3.5-inch SATA hard disk drives
2.5-inch SATA hard disk drives
2.5-inch SATA solid state drivesHot-swappable
SSD Cache Acceleration Support
Gigabit Ethernet Port (RJ45)2Wake on LAN (WOL)
Jumbo Frame
USB 3.2 Gen 1 port4HDMI Output1, HDMI 2.0 (up to 4096 x 2160 @ 60Hz)Form FactorTowerLED IndicatorsPower/Status, LAN, USB, HDD1-4ButtonsPower, USB copy, ResetDimensions (HxWxD)165.3 × 160 × 219.4 mmWeight (Net)2.09 kgWeight (Gross)3.02 kgOperating temperature0 – 40 °C (32°F – 104°F)Storage Temperature-20 – 70°C (-4°F – 158°F)Relative Humidity5-95% RH non-condensing, wet bulb: 27˚C (80.6˚F)Power Supply UnitExternal Power Adapter, 90W, AC 100-240 VFan1 x 120mm, 12VDCSound Level18.5 db(A)System WarningBuzzerKensington Security Slot