Intel X520-SR2 Dual-Port Ethernet Converged Network Adapter (Retail)

Intel X520-SR2 Dual-Port Ethernet Converged Network Adapter (Retail)
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Intel X520-SR2 Dual-Port Ethernet Converged Network Adapter (Retail)

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Intel X520-SR2 Overview

  • 1Description
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  • 20VMDq
  • 21Next-Generation VMDq1 (64 queues per port)
  • 22PC-SIG SR-IOV Implementation (64 virtual functions per port)
  • 23Virtual Machine Load Balancing (VLMB)
  • 24Advanced Packet Filtering
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The Intel X520-SR2 Dual-Port Ethernet Converged Network Adapter is a dual-port 10 Gigabit SFP+ adapter that provides flexibility and scalability in virtual and unified storage environments.

Powered by Intel’s third-generation 10 GbE network controller, the Intel Ethernet 82599 10 Gigabit Ethernet Controller, the X520-SR2 adapter addresses the demanding needs of the next-generation data center by providing virtualization features, flexibility for LAN and SAN networking, and proven, reliable performance.  

The adapter solves networking bottlenecks in virtualized environments. It enables network-intensive applications to achieve the performance expected in a virtualized environment. Whether the physical port is configured in an emulation mode using the virtual switch in the Virtual Machine Monitor (VMM), or is directly assigned to a virtual machine, the adapter delivers excellent output. In the emulation mode, Intel’s I/O technology, Virtual Machine Device queues1 (VMDq) optimizes network performance by offloading data sorting and copying from the software Virtual Switch in the VMM to the Intel Ethernet 82599 10 Gigabit Controller. This configuration is well suited for a large number of VMs running standard applications that have limited bandwidth and latency requirements.  

For mission-critical applications, where dedicated I/O is required for maximum network performance, users can assign a dedicated virtual adapter port to a VM. Using the PCI-SIG SR-IOV capability on the adapter provides direct VM connectivity and data protection across VMs. SR-IOV technology enables the data to bypass the software virtual switch and provides near-native performance. It assigns either physical or virtual I/O ports to individual VMs directly. This technology is used for applications that demand high I/O throughput and low latency performance such as database, storage, financial and other applications.  

The adapter delivers the same functionality and throughput as 10 dual-port, one gigabit adapter, saving cost, power, and complexity. It lowers your data center total cost of ownership (TCO) by providing the ability to route LAN and SAN traffic over a single fabric. It offers FCoE hardware acceleration to provide performance comparable to FC HBAs. The adapter supports Data Center Bridging, also known as Converged Enhanced Ethernet (CEE), which enables customers to configure traffic classes and priorities to deliver a lossless Ethernet fabric. It reduces TCO by eliminating redundant fabrics and saves the cost of expensive FC HBAs and FC switch ports.  

The adapter provides complete support for proven native OS and VMM iSCSI initiators as well as iSCSI boot. It delivers everything; 10 Gigabit LAN, FCoE, and iSCSI; truly delivering on the promise of unified networking. The adapter supports IPsec offload for Microsoft’s Network Access Protection (NAP), Active Directory, and future security capabilities in Windows 7. The adapter enables customers to run a secure network environment without sacrificing performance.  

The PCIe v2.0 (5 GT/s) support enables customers to take full advantage of 10 GbE by providing a maximum of 20 Gb/s bi-directional throughput per port on a single dual port card. Support for technologies such as multiple queues, receive-side scaling, multiple MSI-X vectors, and Low Latency Interrupts enable the X520-SR2 adapter to provide high-performance, 10 Gigabit connectivity in multi-core server blades. These technologies distribute network processing across multiple CPU cores, improving overall performance.

Energy-efficient design for next-generation 10 Gigabit performance and multi-core processors
Adapter with SFP+ connection supports 10GBASE-SR, 10GBASE-LR and SFP+ Copper Direct Attach physical media
Low-profile design enables higher bandwidth and throughput from standard and low-profile PCIe slots and servers
Increases performance on multi-processor systems by efficiently balancing network loads across CPU cores when used with Receive-Side Scaling (RSS) from Microsoft or Scalable I/O on Linux
Provides centralized storage area network (SAN) management at a lower cost than other iSCSI solutions
Includes FCoE Boot and Data Center Bridging
Enables widespread deployment
Complies with the European Union directive 2002/95/EC to reduce the use of hazardous materials
Intel PROSet Utility for Windows Device Manager provides point-and-click management of individual adapters, advanced adapter features, connection teaming, and virtual local area network (VLAN) configuration
Time Sync enables networked Ethernet equipment to synchronize internal clocks according to a network master clock; endpoint can then acquire an accurate estimate of the master time by compensating for link latency
Intel Direct Cache Access (DCA) enables the adapter to pre-fetch the data from memory, avoiding cache misses and improving application response time
MSI-X support minimizes the overhead of interrupts and also allows load-balancing of interrupt handling between multiple cores/CPUs
Low Latency Interrupts based on the sensitivity of the incoming data, the adapter can bypass the automatic moderation of time intervals between the interrupts
Header Splits and Replication in receive helps the driver focus on the relevant part of the packet without the need to parse it
Network packet handling without waiting or buffer overflow providing efficient packet prioritization
Lower processor usage and checksum and segmentation capability extended to new standard packet type
Receive and Transmit Side Scaling for Windows environment and Scalable I/O for Linux environments enables the direction of the interrupts to the processor cores in order to improve the CPU usage rate
Offloads IPsec capability onto the adapter instead of the software to significantly improve I/O throughput and CPU usage (for Windows 2008 Server, Vista, Windows 2008 Server R2, and Windows 7)


Offloads the data-sorting functionality from the Hypervisor to the network silicon, improving data throughput and CPU usage, provides QoS feature on the Tx data by providing round-robin servicing and preventing head-of-line blocking, and sorts based on MAC addresses and VLAN tags

Next-Generation VMDq1 (64 queues per port)

Enhanced QoS feature by providing weighted round-robin servicing for the Tx data
Provides loopback functionality, where data transfer between the virtual machines within the same physical server need not go out to the wire and come back in, improving throughput and CPU usage
Supports replication of multicast and broadcast data

PC-SIG SR-IOV Implementation (64 virtual functions per port)

Provides an implementation of the PCI-SIG standard for I/O Virtualization. The physical configuration of each port is divided into multiple virtual ports. Each virtual port is assigned to an individual virtual machine directly by bypassing the virtual switch in the Hypervisor, resulting in near-native performance.
Integrated with Intel VTI for Directed I/O (VT-d) to provide data protection between virtual machines by assigning separate physical addresses in the memory to each virtual machine.

Virtual Machine Load Balancing (VLMB)

Virtual Machines Load Balancing (VMLB) provides traffic load balancing (Tx and Rx) across Virtual Machines bound to the team interface, as well as fault tolerance in the event of switch, port, cable, or adapter failure.

Advanced Packet Filtering

24 exact-matched packets (unicast or multicast)
4096-bit hash filter for unicast and multicast frames
Lower processor usage
Promiscuous (unicast and multicast) transfer mode support
Optional filtering of invalid frames
VLAN support with VLAN tag insertion, stripping and packet filtering for up to 4096 VLAN tags
Pluggable optic pre-installed
UPC: 735858205207

Intel X520-SR2 Specs

ConnectorFiber Optic
Controller-ProcessorIntel 82599ES Ethernet Controller
Cable TypeMMF 62.5/50 μm (up to 300 m)
SlotPCI Express 2.0 5.0 GT/s lane x 8 lane
HeightLow profile and full height
VirtualizationOn-chip QoS and traffic management, flexible port partitioning, Virtual Machine Device queues (VMDq), PCI-SIG SR-IOV-capable Storage over Ethernet: iSCSI, FCoE, NFS
Network StandardsIEEE 802.3: 10GBASE-SR (E10G41BFSR, E10G42BFSR), 10GBASE-LR (E10G41BFLR)
SFF-8431: 10GSFP+Cu (Direct Attach) (E10G42BTDA)
AdapterIntel PROSet Utility for easy configuration and management
Plug and play specification support: standard
Receive Side Scaling: Multiple Rx queues enable the efficient distribution of network receive processing across multiple CPUs in multiprocessor systems
Direct Cache Access (DCA): The I/O device activates a pre-fetch engine in the CPU that loads the data into the CPU cache ahead of time, before use, eliminating cache misses and reducing CPU load
Data Rate Supported Per PortOptical: 1 GbE/10 GbE, Direct Attach: 10 GbE
Bus TypePCI Express 2.0 (5 GT/s)
Bus Width4-lane PCI Express and 8-lane PCI Express
Interrupt LevelsINTA, MSI, MSI-X
Hardware CertificationsFCC B, UL, CE, VCCI, BSMI, CTICK, KCC
CompatibilityWindows 7, Linux SLES 11 SP1, Windows Vista SP2, Windows Server 2003 SP2, Windows Server 2008 SP2, Windows Server 2008 SP2 Core, Linux Stable Kernel version 2.6, Linux RHEL 4.8, Linux RHEL 5.5, Linux SLES 10 SP3, Linux SLES 11, FreeBSD 8.0
Power ConsumptionDual-port 10GBASE-SR/1000BASE-SX: Maximum: 6.8 W, Typical: 6.5 W
Dual-port 10GBASE-LR/1000BASE-LX: Maximum: 7.0 W, Typical: 6.6 W
Dual-port direct attached twinax: Maximum: 6.2 W, Typical: 5.8 W
Operating Temperature32 to 131°F (0 to 55°C)
Storage Temperature-40 to 158°F (-40 to 70°C)
Air FlowMinimum of 100 LFM required
Storage HumidityMaximum: 90% non-condensing relative humidity at 95°F (35°C)
LED IndicatorsLink (solid) and Activity (blinking) Link Speed (green = 10 Gb/s; yellow = 1 Gb/s)
Length5.73" (14.55 cm) measured without PCIe bracket
Packaging Info
Package Weight0.45 lb
Box Dimensions (LxWxH)8.8 x 5.9 x 1.2"
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