QNAP TS-251 is discontinued


High Performance NAS with On-the-fly & offline Video Transcoding for SOHO and Home Users

TS-x51 Series
• Dual-core Intel® 2.41GHz CPU and 4GB/1GB DDR3L RAM, delivering up to 220MB/s read & write speed
• Run your NAS as a PC with build-in QvPC Technology
• On-the-fly and 4K offline full HD hardware accelerated video transcoding
• Built-in virtual machines technology with Virtualization Station
• Up to 7.1 channel audio passthrough and high-quality multimedia playback via HDMI
• Personal cloud for creating a multimedia library with DLNA, AirPlay, and Plex support
• Centralized storage, file sharing and backup
• Economical storage expansion with scale-up solution by UX-800P or UX-500P,
maximum 8 hard drives with 48TB more storage capacity


CPU Intel® Celeron® 2.41GHz dual-core processor (burst up to 2.58GHz)
TS-251-4G: 4GB DDR3L RAM (2GB x 2)
Total memory slots: 2 (expandable up to 8GB)
1. When installing two memory modules, please ensure that they are the same size and ideally use the same type of RAM for both memory slots.
2. For the information of RAM module installation and compatible NAS models, please refer to the QNAP RAM Module Installation Guide
Flash Memory 512MB DOM
Hard Disk Drive 2 x 3.5” or 2.5” SATA 6Gb/s, SATA 3Gb/s hard drive or SSD
1. The system is shipped without HDD.
2. For the HDD compatibility list, please visit https://www.qnap.com/compatibility/
Hard Disk Tray 2 x Hot-swappable tray
LAN Port 2 x Gigabit RJ-45 Ethernet port
LED Indicators Status, LAN, USB, HDD 1, HDD 2
USB 2 x USB 3.0 port (Front: 1, Rear: 1)
2 x USB 2.0 port (Rear: 2)
Support USB printer, pen drive, and USB UPS etc.
Buttons Power/Status, USB One-Touch-Backup, reset

Can I still buy it?

Replaced models listed here:


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