QNAP TS-251D User Manual

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

QNAP TS-251D Specifications

General

Type	NAS
Noise level	16.7 dB
Device class	Home & Home Office
Share folder	CIFS/SMB, FTP, WebDAV
Backup features	Cloud, USB drive
Backup function	Yes
Browser supported	Apple Safari 7+, Google Chrome, Microsoft Internet Explorer 10+, Mozilla Firefox
Security algorithms	256-bit AES, FIPS 140-2, SNMPv3, SSH, SSL/TLS
Storage temperature (T-T)	-20 - 70 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	5 - 95 %
Chassis type	Tower
Cooling type	Active
Fan diameter	70 mm
Product color	White
LED indicators	HDD, LAN, Power, Status, USB
Number of fans	1 fan(s)
Cable lock slot type	Kensington
Fiber ports quantity	0
USB 2.0 ports quantity	3
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity	2
Wi-Fi	No
Ethernet LAN data rates	1000 Mbit/s
Supported network protocols	TCP/IP, PTP, L2TP/IPSec, OpenVPN, QBelt(, FTP, SFTP, TFTP
Flash memory	4000 MB
Internal memory	4 GB
Memory form factor	SO-DIMM
Internal memory type	DDR4
Maximum RAM supported	8 GB
Cables included	AC, LAN (RJ-45)
Number of screws	14
Tjunction	105 °C
Processor cache	4 MB
Processor model	J4005
System bus rate	- GT/s
Processor family	Intel® Celeron®
Processor socket	BGA 1090
Processor codename	Gemini Lake
Processor frequency	2 GHz
Processor lithography	14 nm
Processor manufacturer	Intel
Processor package size	25 x 24 mm
Processor boost frequency	2.7 GHz
Processor operating modes	64-bit
PCI Express configurations	1x2, 1x2+2x1, 1x4, 2x1, 4x1
Thermal Design Power (TDP)	10 W
On-board graphics card model	Intel® UHD Graphics 600
Fan voltage	12 V
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Power supply location	External
Power consumption (sleep)	8.08 W
Power consumption (typical)	15.25 W
Power supply unit (PSU) capacity	65 W
Operating system version	5.0.0
Operating system installed	QNAP QTS
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 10.13 High Sierra, Mac OS X 10.14 Mojave, Mac OS X 10.15 Catalina, Mac OS X 10.7 Lion, Mac OS X 10.8 Mountain Lion, Mac OS X 10.9 Mavericks
Server operating systems supported	Windows Server 2003, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019
Windows operating systems supported	Windows 10, Windows 7, Windows 8
RAID levels	0, 1, JBOD
Storage drive size	- \
Storage drive capacity	0 GB
Supported file systems	FAT32, HFS+, NTFS, ext3, ext4
Storage drive interface	-
Storage drive sizes supported	3.5 \
Supported storage drive types	HDD & SSD
Total installed storage capacity	0 TB
Supported storage drive interfaces	Serial ATA II, Serial ATA III
Number of execution units	12
Maximum number of PCI Express lanes	6
Memory types supported by processor	DDR4-SDRAM, LPDDR4-SDRAM
Intel Smart Response Technology version	0.00
Intel Identity Protection Technology version	1.00
On-board graphics card ID	0x3185
On-board graphics card base frequency	250 MHz
On-board graphics card DirectX version	12.0
On-board graphics card dynamic frequency (max)	700 MHz
Processor ARK ID	128992
Harmonized System (HS) code	84714100

Weight and Dimensions

Depth	226 mm
Width	105 mm
Height	168 mm
Weight	1480 g
Package weight	2580 g