TS-451+-2G CPU Intel® Celeron® J1900 quad-core 2.0 GHz processor (burst up to 2.42 GHz) CPU Architecture 64-bit x86 Graphic Processors Intel® HD Graphics Floating Point Unit Hardware-accelerated Transcoding , up to 1080P System Memory 2 GB SO-DIMM DDR3L (1 x 2 GB) Maximum Memory 8 GB (2 x 4GB) Memory Slot 2 x SO-DIMM DDR3L For dual-DIMM configurations, you must use a pair of identical DDR3L modules. Flash Memory 512MB (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 SATA hard disk drives 2.5-inch SATA hard disk drives 2.5-inch SATA solid state drives Hot-swappable SSD Cache Acceleration Support Gigabit Ethernet Port (RJ45) 2 Jumbo Frame USB 2.0 port 2 USB 3.2 Gen 1 port 2 IR Sensor (RM-IR002 & MCE) HDMI Output 1, (up to 1080p) Form Factor Tower LED Indicators Power/Status, LAN, USB, HDD1-4 Buttons Power, Reset, USB Auto Copy Dimensions (HxWxD) 177 × 180 × 235 mm Weight (Net) 3 kg Weight (Gross) 4.3 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 90W adapter, 100-240V Power Consumption: HDD Sleep Mode 15.78 W Power Consumption: Operating Mode, Typical 33.88 W Fan 1 x 120mm, 12VDC Sound Level 16.9 db(A) System Warning Buzzer Kensington Security Slot Max. Number of Concurrent Connections (CIFS) 800