TS-251B-4G

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Identifiers
Model QNAP TS-251B-4G/20TB-ULTRA
MPN QNAP TS-251B-4G/20TB-ULTRA
Dimensions / Weight
Key Features
3.5 mm out
Indicates whether the product includes a standard 3.5 mm audio output jack for connecting headphones, speakers or other audio devices.
Yes
AC input voltage
The alternating current voltage range that the product accepts from its power source, expressed in volts (V). It indicates the minimum and maximum supply voltages compatible with the device.
100 - 240 V
Access Control List ACL
Indicates whether the product supports an Access Control List (ACL) feature, allowing administrators to define rules that permit or deny network traffic based on criteria such as IP address, port number, or protocol.
Yes
Backup features USB drive
Backup function
Indicates whether a device has the capability to create backups of its data or settings, allowing restoration in case of loss, failure, or interruption.
Yes
Bad block scan
Indicates whether the device performs a bad block scan to detect and mark defective storage sectors. A value of Yes means the feature is available, while No means it is not.
Yes
Browser supported
A list of web browsers that the product can run or support, typically including major desktop and mobile browsers such as Chrome, Firefox, Safari, Edge, Internet Explorer, Opera, and others. Each value represents a distinct browser name or version range that has been verified to work with the device.
Apple Safari 7 or later, Google Chrome, Microsoft Internet Explorer 10 or later, Mozilla Firefox
Built-in display
Indicates whether the product includes a built‑in screen or display unit that can be used directly for viewing content, such as an integrated monitor on a laptop or a built-in display on appliances. A value of "Yes" means the device has such a display; a value of "No" means it does not.
No
Built-in FTP server
Indicates whether the product includes a built‑in FTP server that allows file transfer and management over the network without requiring an external device.
Yes
Built-in iTunes server Yes
Built-in speakers
Indicates whether the product includes built‑in speaker(s) that can produce sound without requiring external audio devices. A value of "Yes" means the device has one or more integrated speakers; a value of "No" means it does not.
Yes
Builtin speakers
The total number of integrated speaker units present in the product. This value indicates how many separate speaker elements are built into the device, helping users compare audio capabilities across models.
1
Buzzer Yes
Cable lock slot
Indicates whether the product includes a slot for inserting a cable lock, such as a Kensington or similar security device.
Yes
Cable Lock Slot
Indicates whether the product includes a slot for inserting a cable lock, such as a Kensington or similar security device.
Yes
Cable lock slot type
The specific type of cable lock interface that a device provides for securing cables, such as Kensington, Noble, IBM or other standard locking mechanisms.
Kensington
Cables included
A list of the cable types that are supplied with the product, such as USB, HDMI, VGA, DisplayPort, LAN (RJ‑45), SATA, audio or other relevant connectors.
AC,LAN (RJ-45)
Chassis type
The physical configuration or shape of a computer chassis, such as tower, rack‑mount (e.g., 1U, 2U), desktop, mini‑PC, or other compact designs. It indicates the overall size and mounting style that determines compatibility with motherboards, power supplies, and case accessories.
Tower
Colour
The colour or combination of colours that a product is available in, expressed as common names such as "Black", "Silver" or comma‑separated lists like "Black, White". It indicates the visual appearance of the item for consumers.
White
Conflict free processor
Indicates whether the processor in the device is certified as conflict‑free, meaning it has been tested and confirmed to operate without conflicts or incompatibilities with other system components. A value of "Yes" means the processor meets the conflict‑free standard; "No" indicates it does not.
Yes
Cooling type
The method used to dissipate heat from a component or system, such as active cooling (fans or liquid loops), passive heat sinks, or no active cooling. It indicates whether the product relies on airflow, conduction, or other mechanisms to maintain safe operating temperatures.
Active
Depth
The linear measurement of an object from front to back or top to bottom, expressed in a physical unit such as millimeters, centimeters, inches, etc. It indicates how deep the item is and can be used for fitting, compatibility, or spatial planning.
226 mm
Device class
A free‑text label that identifies the general category or type of a device, such as "NAS", "Server", "Router", "Storage Enclosure" or any other descriptive class used by manufacturers to classify their products. The value is intended to help users quickly understand the primary function or form factor of the item.
Home & Home Office
DHCP client
Indicates whether the device supports the DHCP client function, meaning it can automatically request an IP address and related network settings from a DHCP server.
Yes
DHCP Client
Indicates whether a device supports the DHCP client function, meaning it can automatically request an IP address and related network settings from a DHCP server.
Yes
DHCP server
Indicates whether the device supports acting as a DHCP server, allowing it to assign IP addresses and network configuration settings to clients on the network.
Yes
Dynamic DNS DDNS
Indicates whether a device can automatically update its IP address with a Dynamic DNS service, allowing remote access even when the public IP changes.
Yes
ECC supported by processor
Indicates whether the processor in a device supports Error Correcting Code (ECC) memory, allowing detection and correction of single-bit errors during data storage or transfer.
No
Embedded options available
Indicates whether the product includes embedded options such as firmware features, hardware modules or configuration settings that are built into the device and available for use without external accessories.
No
Enhanced intel speedstep technology Yes
Ethernet LAN
Indicates whether the product has an Ethernet interface for wired network connectivity, allowing data transmission over RJ‑45 or compatible cables.
Yes
Ethernet LAN data rates
Maximum theoretical speed at which a device can send or receive data over its Ethernet LAN interface, expressed in megabits per second (Mbps) or gigabits per second (Gbps). It represents the upper bound of throughput under optimal conditions and is useful for comparing network performance between devices with wired connectivity.
10,100,1000 Mbit/s
Execute disable bit
Indicates whether the processor’s Execute Disable bit is enabled, allowing the CPU to prevent execution of code from memory regions marked as non-executable.
Yes
Execution units
Represents the count of independent execution units within a processor or similar component. The value is an integer without any unit of measure, indicating how many discrete execution cores or threads are available for parallel processing.
12
External power adapter
Indicates whether the product comes with an external power adapter in its packaging. A value of "Yes" means a charger is supplied; a value of "No" means no charger is included and the user must obtain one separately.
Yes
Fan diameter
The linear measurement across the widest part of a fan, expressed in units such as millimeters (mm), centimeters (cm) or inches (in). It represents the overall width of the fan and is useful for determining fit, compatibility with cases, and airflow characteristics.
7 cm
Flash memory
The total amount of internal flash memory available in a device, expressed as a data size (e.g., megabytes or gigabytes). This attribute indicates how much data can be stored on the device’s built‑in flash storage.
4096 MB
Height
The vertical dimension of a product measured from its lowest to highest point. It is expressed in a physical unit such as millimetres, centimetres or inches and applies to any item where height is relevant, including books, electronics, furniture and other objects.
168 mm
Hot spare
Indicates whether the device includes an active backup unit (hot spare) that can automatically replace a failed drive without service interruption.
Yes
Hot-swap drive bays
Indicates whether the product’s drive bays support hot‑swap, meaning drives can be inserted or removed while the device is powered on without shutting down or rebooting.
Yes
Idle states
A list of the various low‑power or standby modes that a device can enter to conserve energy when not actively performing tasks.
Yes
Installed storage drive type HDD
Intel 64
Indicates whether the product is compatible with Intel® 64 architecture, enabling it to run operating systems and applications designed for x86‑64 processors.
Yes
Intel clear video technology
Indicates whether the product incorporates Intel’s Clear Video HD technology, a hardware feature that enhances video playback and capture quality by providing smoother motion, reduced artifacts, and improved color accuracy.
Yes
Intel enhanced halt state
Indicates whether the processor includes Intel’s Enhanced Halt State feature, which allows the CPU to enter a low‑power idle mode when not actively executing instructions, thereby reducing energy consumption without compromising performance.
Yes
Intel rapid storage technology
Indicates whether the product supports Intel Rapid Storage Technology, a software and firmware solution that enables RAID configurations, improves storage performance, and provides data protection features for compatible drives.
No
Intel secure boot
Indicates whether the product supports Intel Secure Boot, a firmware security feature that verifies the integrity of the operating system and bootloader before allowing them to run. This helps protect against rootkits and unauthorized software.
Yes
Intel Secure Boot
Indicates whether the product supports Intel Secure Boot, a firmware security feature that ensures only trusted software is loaded during system startup.
Yes
Intel smart connect technology
Indicates whether the product incorporates Intel Smart Connect Technology, a feature that enables automatic network connectivity and device management for seamless integration into enterprise or home environments.
No
Intel Stable Image Platform Program No
Intel trusted execution technology
Indicates whether the product incorporates Intel’s Trusted Execution Technology, a security feature that creates isolated execution environments to protect sensitive code and data from tampering or unauthorized access.
No
Intel Virtualization Technology
Indicates whether the product supports Intel’s virtualization technology, which enables efficient execution of virtual machines by providing hardware‑assisted features such as VT‑x and VT‑d for CPU instruction set extensions.
Yes
Intel Virtualization Technology for Directed I/O
Indicates whether the product supports Intel Virtualization Technology for Directed I/O, a feature that enables efficient virtualization of input/output operations by allowing virtual machines to directly access hardware devices.
Yes
Intel VT-x with Extended Page Tables Yes
Intel® AES New instructions
Indicates whether the product’s processor supports the Intel® Advanced Encryption Standard (AES) instruction set, which enables faster and more efficient cryptographic operations.
Yes
Intel® Anti-Theft Technology
Indicates whether a product incorporates Intel’s anti‑theft technology, which provides hardware‑based protection against unauthorized access and theft of the device.
No
Intel® Clear Video HD Technology Yes
Intel® Clear Video Technology for Mobile Internet Devices
Indicates whether the product incorporates Intel’s Clear Video HD technology, a hardware acceleration feature that improves video playback and capture quality by optimizing decoding and rendering pipelines.
Yes
Intel® High Definition Audio
Indicates whether the product supports Intel High Definition Audio technology, which provides high‑quality audio input and output through an integrated audio controller.
Yes
Intel® Hyper Threading Technology
Indicates whether the processor supports Intel® Hyper‑Threading Technology, allowing each physical core to handle multiple execution threads simultaneously for improved multitasking performance.
No
Intel® Identity Protection Technology
Indicates whether the product incorporates Intel® Identity Protection Technology, a security feature that protects user identities and credentials by providing secure authentication and credential management.
Yes
Intel® Insider™ No
Intel® InTru™ 3D Technology
Indicates whether the product incorporates Intel® InTru™ 3D technology, a feature that enables efficient generation and rendering of three‑dimensional content with improved performance and visual quality.
No
Intel® OS Guard
Indicates whether the product incorporates Intel® OS Guard, a security feature that protects the operating system from attacks and ensures software integrity.
No
Intel® Quick Sync Video Technology
Indicates whether the product incorporates Intel Quick Sync Video, a hardware‑accelerated video processing feature that enables faster encoding and decoding of common formats such as H.264, H.265, and VP9 while reducing power consumption.
Yes
Intel® Secure Key
Indicates whether the product includes Intel Secure Key support, a hardware feature that allows secure generation and storage of cryptographic keys within the processor. Presence of this capability enhances protection against physical attacks and simplifies key management for sensitive data.
Yes
Intel® Small Business Advantage
Indicates whether the product supports Intel® Small Business Advantage, a program that provides small businesses with access to discounted hardware, software, and services tailored for their needs.
No
Intel® Smart Response Technology
Indicates whether the product incorporates Intel Smart Response, a technology that accelerates hard‑disk performance by using a portion of system memory as a cache for frequently accessed data.
No
Intel® Turbo Boost Technology
The maximum operating frequency that a processor can reach when its turbo or boost feature is active, expressed in hertz (Hz). This value indicates the peak performance capability of the CPU under load and helps users compare how fast a processor can run beyond its base clock speed.
No
Intel® Wireless Display
Indicates whether the product can stream video and audio wirelessly to a compatible display or receiver using technologies such as Miracast, Intel Wi‑Display, or similar protocols. A value of "Yes" means the device has the necessary hardware and software support; "No" means it does not.
No
Internal memory
The total amount of internal memory available in a device, expressed as a data size such as megabytes (MB) or gigabytes (GB). It indicates how much information the component can hold for active processes and affects multitasking performance.
4 GB
Internal memory type
The type of memory physically installed inside a device, such as DDR4 SDRAM, LPDDR3, or other RAM variants. It indicates the architecture and generation of the internal memory modules that the product uses or supports.
DDR3L
iSCSI support Yes
Jumbo frames support Yes
LED indicators
A list of the functions or statuses that an LED indicator on a device can display, such as power status, activity, link, and other operational signals.
HDD,LAN,Power,Status,USB
Linux operating systems supported
List of Linux operating systems that the product is compatible with, including specific versions and architectures when relevant. Each value represents a distinct Linux distribution or kernel version supported by the hardware or software.
Yes
Management protocols
A list of network protocols that a device can use for configuration, monitoring and remote management, such as SNMP, HTTP/HTTPS, Telnet, SSH or other standard interfaces. Each protocol is represented by its common name and may be separated by commas or slashes in the source data.
SNMP
Maximum internal memory supported by processor 8 GB
Maximum number of PCI Express lanes
The total count of PCI Express lanes available on a device or component, indicating the maximum number of high‑speed data channels that can be used simultaneously for peripherals such as graphics cards, storage controllers, and networking adapters.
6
Memory channels supported by processor
The total count of independent memory channels supported by a processor or motherboard, indicating how many separate memory paths can be used simultaneously. This value helps users understand the potential for parallel memory access and overall system performance.
Dual
Memory slots
The count of physical memory slots available on a device for installing RAM modules. It indicates how many separate memory sticks can be installed or upgraded.
2
Memory types supported by processor DDR3L,LPDDR3-SDRAM,LPDDR4-SDRAM
Microphone in
Indicates whether the product includes at least one built‑in microphone. A value of "Yes" means that the device has an integrated microphone, while "No" indicates it does not.
Yes
Multilingual support
Indicates whether a product supports multiple languages for its user interface, documentation or help resources. A value of "Yes" means the device offers language options beyond the default; "No" indicates it is limited to a single language.
Yes
Noise level
The sound intensity produced by a product, expressed in decibels (dB) or sones. It indicates how loud the device is during operation and helps users assess suitability for quiet environments.
17.3 dB
On-board graphics adapter base frequency
The clock speed at which the integrated graphics processor runs under normal conditions, expressed in hertz (Hz). It indicates how many cycles per second the GPU performs and is useful for comparing visual performance across devices that use an on‑board graphics solution.
250 MHz
On-board graphics adapter burst frequency 700 MHz
On-board graphics adapter model
The model name or number of the integrated graphics adapter built into a device, such as a laptop or motherboard. It identifies the specific GPU variant used for rendering and video processing, allowing users to compare visual performance and compatibility across products.
Intel® HD Graphics 500
On/off switch
Indicates whether the product includes an on/off switch that allows the user to power it on or off manually.
Yes
Operating system installed
The operating system that is installed on the device, indicating the software platform that manages hardware resources and provides services for applications. It can be a commercial OS such as Windows or macOS, an open‑source distribution like Linux, or a proprietary firmware used in embedded devices.
QNAP Turbo System
Operating system version
The specific version of the operating system that a product supports or runs, expressed as a numeric revision (e.g., 10, 11) or a descriptive name (e.g., Nougat). This attribute helps users determine compatibility with software and updates.
4.3.4
PCI Express configurations
A textual description of how PCI Express lanes are distributed across the available slots or interfaces in a device. The value typically lists groups of lanes separated by commas, where each group may contain a number of lanes and optional ‘+’ signs to indicate combined lanes that share the same speed (e.g., "1x16", "2x8", "1x8+2x4"). This attribute helps users understand the bandwidth capacity and compatibility of expansion slots.
1x2+2x1,4x1
PCI Express slots version 2.0
Power supply location
The physical position where the power supply unit is installed or mounted within a device, such as top, bottom, rear, side, front, or built‑in. This attribute helps users understand where to find the power source and plan cable routing or ventilation.
External
Power supply unit PSU capacity
The electrical power rating of a power supply unit (PSU), expressed in watts (W). It indicates the maximum output power that the PSU can deliver to connected components, helping users assess compatibility and energy requirements for their system.
65 W
Processor ARK ID
The unique numeric identifier assigned by Intel to each processor model, used for precise identification and lookup of technical specifications.
95597
Processor cache type
Indicates the level or category of a processor’s internal cache memory, such as L1, L2, L3, or Smart Cache. This attribute helps users understand the hierarchy and accessibility of cached data within the CPU, which can influence performance characteristics.
Smart Cache
Processor code
A unique identifier that represents the specific model or variant of a computer processor. The code is typically an alphanumeric string (e.g., "SR2ZU", "SR3LA") used by manufacturers to distinguish between different CPU models, generations, and configurations. It can be entered as free text and may appear in product listings, technical specifications, or inventory records.
SR2Z8
Processor codename Apollo Lake
Processor family
The processor family identifies the group or series of CPU models that share a common architecture, design, and performance characteristics. It helps users compare processors across brands and generations by indicating the underlying technology used in the chip.
Intel® Celeron®
Processor frequency
The fundamental operating frequency of a processor, expressed in hertz (Hz). It indicates the speed at which the CPU runs under normal conditions and is typically reported in gigahertz (GHz) or megahertz (MHz). This value helps users compare performance potential across different models.
2.00 GHz
Processor lithography 14 nm
Processor model
Identifies the exact model of the central processing unit used in a device, including brand and numeric designation such as "Intel Core i5-8250U" or "AMD Ryzen 7 3700X". This value allows users to distinguish between different processor families, generations, and performance levels.
J3355
Processor operating modes
The set of instruction set architectures or execution modes that a processor can operate in, such as 32‑bit or 64‑bit. This attribute lists the supported modes for the CPU and helps users determine compatibility with software that requires a specific bitness.
64-bit
Processor package size
The overall dimensions of a processor’s physical package, expressed as length × width × height in millimetres or inches. It indicates the size that must fit within a motherboard socket or mounting area and helps users compare compatibility across different CPU models.
24 x 31 mm
Processor socket
The physical connector used by a processor to attach to a motherboard or other compatible platform. Common examples include LGA 1151, BGA 1440, Socket AM4, and LGA 1200. This attribute indicates the exact socket designation required for proper CPU installation and compatibility.
BGA 1296
Quick installation guide
Indicates whether a quick‑installation guide is provided with the product. A value of "Yes" means that a brief, step‑by‑step manual or overview is included to help users set up the device quickly; "No" indicates that no such guide is supplied.
Yes
RAID levels
A comma‑separated list that specifies the RAID configurations supported by a storage controller or device. Each entry can be a numeric level (e.g., 0, 1, 5, 10) or a special label such as JBOD. This attribute indicates which disk arrangements the system can manage.
0, 1, JBOD
RAID Support
A comma‑separated list of RAID levels that a storage device or controller can support, such as 0, 1, 5, 10, JBOD, and other proprietary configurations. Each value represents a distinct RAID mode the system is capable of creating or managing.
Yes
RAID support
Indicates whether the product supports RAID (Redundant Array of Independent Disks) functionality. A value of "Yes" means the device can configure and manage multiple disks as a single logical unit for performance or redundancy; "No" indicates no RAID capability.
Yes
Reset button
Indicates whether the device has a physical reset button that restores factory settings or original configuration when pressed.
Yes
Security algorithms
A list of cryptographic and authentication methods that a device can use for secure communication or data protection. Each entry represents a distinct algorithm or protocol, such as encryption ciphers (e.g., AES, WEP), authentication mechanisms (e.g., RADIUS, WPA‑PSK), or network security protocols (e.g., HTTPS, SSL/TLS). The values are typically separated by commas and may include both technical identifiers and consumer‑friendly labels.
256-bit AES,FIPS 140-2,HTTPS,SSH,SSL/TLS
Share folder
A list of network file‑sharing protocols that the device can use to expose shared folders or drives. Common values include CIFS/SMB, AFP, NFS, FTP, and WebDAV. The attribute helps users understand which remote access methods are available for mounting or accessing storage on the device.
CIFS/SMB
Share folder access right management
Indicates whether the product allows users to manage access rights for shared folders. A value of "Yes" means that the device or service provides a mechanism to assign, modify, or revoke permissions on shared directories, enabling controlled sharing among multiple users.
Yes
Storage drive sizes supported
A list of the physical sizes and types of storage drives that a product can accommodate, such as 2.5‑inch, 3.5‑inch, or M.2. The values are typically separated by commas and may include additional descriptors like "M.2" to indicate an internal solid‑state drive interface.
2.5,3.5"
Storage drives installed
The total count of individual storage devices (hard disk drives or solid‑state drives) that are physically present in the product. It indicates how many separate drives are installed, regardless of capacity or interface type.
Yes
Supported file systems
A comma‑separated list of file system formats that the product can read or write, such as FAT32, NTFS, ext4, exFAT, HFS+, and others. Each value represents a distinct storage format supported by the device’s firmware or operating system.
FAT32,HFS+,NTFS,exFAT,ext3,ext4
Supported storage drive interfaces
List of physical or logical interfaces that allow an internal storage drive to communicate with the system, such as SATA, M.2 PCIe, U.2, SAS, NVMe, or other standard connections.
Serial ATA III
Supported storage drive types
A list of the types of storage drives that a product can use, such as HDD or SSD. Each entry indicates a distinct drive type supported by the device, allowing users to understand which internal or external storage media are compatible.
HDD,SSD
System bus rate
The highest theoretical speed at which the system bus can transfer data, expressed in gigatransfers per second (GT/s). This value indicates the bandwidth capacity of the internal communication pathway between components such as the CPU and memory or peripheral devices.
5 GT/s
System log
Indicates whether the product includes a system log feature that records events, errors, or status updates for troubleshooting and monitoring purposes. The value is a simple yes/no answer.
Yes
Thermal design power
The maximum amount of power, expressed in watts (W), that a processor or other electronic component is designed to dissipate as heat under typical operating conditions. It represents the thermal load the cooling system must handle and is used by manufacturers and users to assess performance, energy consumption, and suitability for specific environments.
10 W
Thermal monitoring technologies Yes
Tjunction
The maximum ambient temperature at which the product can safely operate without risk of damage or performance degradation.
105 °C
Type
The general category or style of the product, such as laptop, printer cartridge, or cooling fan. It helps buyers quickly identify the nature of the item and compare similar products.
NAS
UART
Indicates whether the product includes a UART (Universal Asynchronous Receiver/Transmitter) serial communication interface. A value of "Yes" means the device has at least one UART port for transmitting and receiving serial data; "No" indicates no such interface is present.
Yes
Universal Plug and Play UPnP
Indicates whether the product can automatically discover and communicate with other devices on the network using Universal Plug and Play (UPnP) protocols, enabling seamless configuration and media sharing without manual setup.
Yes
USB port
Indicates the presence and quantity of USB connectors on a product. The value is typically an integer representing how many USB ports are available, regardless of type or version.
Yes
Wake-on-LAN ready
Indicates whether the device can be powered on remotely via Wake‑on‑LAN, allowing a network administrator or user to start it from sleep or off state using a network packet.
Yes
Wi-Fi
Indicates whether the product has built‑in Wi‑Fi capability, allowing it to connect to wireless networks without requiring external adapters or dongles.
No
Windows operating systems supported
A list of Microsoft Windows operating system versions that the product is compatible with, including any relevant architecture or edition information.
Windows 10,Windows 7,Windows 8
QNAP

QNAP is a Taiwanese technology company that produces network-attached storage (NAS) devices. The company was founded in 2004 and is headquartered in Taipei. QNAP's products are used by consumers, small businesses, and enterprises, and include NAS devices, surveillance solutions, and cloud storage services.