| Browser supported | Microsoft Internet Explorer 10+, Google Chrome, Apple Safari 7+, Mozilla Firefox |
| Operating system version | 4.3 |
| Number of screws | 112 |
| Width | 18.9" |
| Depth | 21.1" |
| Height | 5.12" |
| Weight | 34 lbs |
| Type | NAS |
| Quick installation guide | Y |
| Device class | Small & Medium Business |
| Maximum RAM supported | 64 GB |
| PCI Express x4 (Gen 3.x) slots | 1 |
| Wake-on-LAN ready | Y |
| Power management | Y |
| Access Control List (ACL) | Y |
| Digital Living Network Alliance (DLNA) certified | Y |
| Multilingual support | Y |
| Built-in iTunes server | Y |
| Built-in FTP server | Y |
| Share folder | CIFS/SMB |
| Supported file systems | FAT32,HFS+,NTFS,exFAT,ext3,ext4 |
| Fan voltage | 12 V |
| Ethernet LAN data rate supported (max) | 10000 Mbit/s |
| Product color | Black |
| Ethernet LAN (RJ-45) ports | 4 |
| USB 2.0 ports quantity | 4 |
| USB port | Y |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 2 |
| Chassis type | Rack (3U) |
| Operating temperature (T-T) | 0 - 40 °C |
| Operating relative humidity (H-H) | 5 - 95 % |
| Power supply unit (PSU) capacity | 350 W |
| AC input frequency | 50 - 60 Hz |
| AC input voltage | 100 - 240 V |
| Number of power supply units | 2 |
| Redundant power supply (RPS) support | Y |
| Power supply location | Built-in |
| Internal memory | 8 GB |
| Internal memory type | DDR4 |
| Number of fans | 4 fan(s) |
| Cooling type | Active |
| LED indicators | HDD, LAN, Power, Status |
| S.M.A.R.T. support | Y |
| Linux operating systems supported | Y |
| Mac compatibility | Y |
| Cables included | AC, LAN (RJ-45) |
| Fan diameter | 3.62" |
| Fiber optic connector | SFP+ |
| Fiber ports quantity | 2 |
| Ethernet LAN | Y |
| Backup function | Y |
| Backup features | Cloud, iSCSI LUN |
| Reset button | Y |
| Processor frequency | 2.1 GHz |
| Number of storage drives supported | 18 |
| RAID support | Y |
| RAID levels | 0,1,5,6,10,JBOD |
| Storage drives installed | N |
| Installed storage drive type | N |
| Supported storage drive types | HDD & SSD |
| Storage drive interface | M.2, Serial ATA III |
| Storage drive size | 2.5/3.5" |
| Ethernet LAN data rates | 10,100,1000 Mbit/s |
| Wi-Fi | N |
| DHCP client | Y |
| iSCSI support | Y |
| Web-based management | Y |
| DHCP server | Y |
| Mac operating systems supported | Mac OS X 10.10 Yosemite,Mac OS X 10.11 El Capitan,Mac OS X 10.12 Sierra,Mac OS X 10.7 Lion,Mac OS X 10.8 Mountain Lion,Mac OS X 10.9 Mavericks |
| Windows operating systems supported | Windows 10 Education,Windows 10 Education x64,Windows 10 Enterprise,Windows 10 Enterprise x64,Windows 10 Home,Windows 10 Home x64,Windows 10 IOT Core,Windows 10 Pro,Windows 10 Pro x64,Windows 7 Enterprise,Windows 7 Enterprise x64,Windows 7 Home Basic,Windows 7 Home Basic x64,Windows 7 Home Premium,Windows 7 Home Premium x64,Windows 7 Professional,Windows 7 Professional x64,Windows 7 Starter,Windows 7 Starter x64,Windows 7 Ultimate,Windows 7 Ultimate x64,Windows 8,Windows 8 Enterprise,Windows 8 Enterprise x64,Windows 8 Pro,Windows 8 Pro x64,Windows 8 x64 |
| Flash memory | 512 MB |
| Memory slots | 4 |
| Processor family | AMD Embedded R-Series SoC |
| Processor model | RX-421ND |
| Processor boost frequency | 3.4 GHz |
| Processor cores | 4 |
| Server operating systems supported | Windows Server 2003,Windows Server 2008 R2,Windows Server 2012,Windows Server 2012 R2 |
| Operating system installed | QNAP Turbo System |
| Security algorithms | 256-bit AES,FIPS 140-2,HTTPS,SNMP,SNMPv3,SSH,SSL/TLS |
| Supported network protocols | CIFS/SMB, AFP v3.3, NFS v3, FTP, FTPS, SFTP, TFTP, HTTP(S), Telnet, SSH, iSCSI, SNMP, SMTP, SMSC |