2. Product Overview
This chapter provides basic information about the QNAP TS-251D NAS.
About the TS-251D
The TS-251D is powered by an Intel® Celeron® J4005 dual-core 2.0 GHz processor with burst frequency up
to 2.7 GHz. The TS-251D supports up to 8 GB of DDR4 RAM and features USB One Touch Copy, a Gigabit
LAN port, and a PCIe slot. With Intel® AES-NI 256 hardware-accelerated encryption engine, the TS-251D
ensures the security of sensitive data and protects important information stored on the NAS.
Hardware Specifications
Warning
• If your QNAP product has hardware defects, return the product to QNAP or a QNAP-
authorized service center for maintenance or replacement. Any attempt to repair or
perform maintenance procedures on the product by you or an unauthorized third-party
invalidates the warranty.
• QNAP is not responsible for any damage or data loss caused by unauthorized
modifications and installation of unsupported third-party applications.
For details, see the QNAP Warranty Terms and Conditions.
Ordering P/N CPU Memory Power supply
TS-251D-2G Intel® Celeron® J4005 2 GB Single
TS-251D-4G Intel® Celeron® J4005 4 GB Single
Component TS-251D-2G TS-251D-4G
Processor
CPU Intel® Celeron® J4005
Frequency Dual-core/2-thread 2.0 GHz base/2.7 GHz burst
Architecture x86 64-bit
Encryption engine AES-NI
Memory
Pre-installed memory 2 GB RAM: 1 x 2 GB SODIMM
DDR4
4 GB RAM: 1 x 4 GB SODIMM
DDR4
Memory slots 2 x SODIMM DDR4
Important
• Use only QNAP memory modules to maintain
system performance and stability. For NAS devices
with more than one memory slot, use QNAP
modules with identical specifications.
• Using unsupported modules may degrade
performance, cause errors, or prevent the
operating system from starting.
Maximum memory 8 GB RAM: 2 x 4 GB
Flash memory 4 GB (Dual-boot OS protection)
TS-251D User Guide
Product Overview 4
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