Technical Specifications - Hardware
CPU : Intel Atom C2538 Quad Core 2.4GHz
Hardware Encryption Engine : Yes (AES-NI)
Floating Point Unit : Yes
RAM Size : DDR3 2 GB (Expandable up to 6 GB)
Support to Internal HDD / SSD 3.5” or 2.5” SATA(II) : Max 4
Hot Swappable Drive : Yes
External Ports USB 3.0 ports X 2, eSATA X 1
Size (HxWxD) (mm) : 44 X 430.5 X 591.8
Nework interface : Gigabit X 4
Link : https://global.synologydownload.com/download/Document/Hardware/DataSheet/RackStation/15-year/RS815RP+/enu/Synology_RS815_Plus_RS815RP_Plus_Data_Sheet_enu.pdf