Chelsio T520-SO-CR Dual Port 10Gb Ethernet Network Unified Card 2x SFP+ inc

Tax included

Chelsio T520-SO-CR 

Out of stock

Chelsio T520-SO-CR

Chelsio T520-SO-CR Dual Port 10Gb Ethernet Network Unified Card 

Long bracket,

2x original Chelsio SFP's included

Grade:2 with a 1 Year RTB warranty 


Chelsio’s T520-SO-CR is a memory free dual-port 10 Gigabit Ethernet Unified Wire adapter with a PCI Express 3.0 host bus interface, optimized for cloud computing, virtualization, storage, and other data center applications.


This adapter, based on the fifth-generation (T5) technology from Chelsio provides the highest 10GbE performance available and dramatically lowers host-system CPU communications overhead with on-board hardware that off-loads TCP/IP processing from its host system. T520-SO-CR frees up host CPU cycles for useful applications. The system achieves increased bandwidth, lower latency, and uses less power.


The Unified Wire Solution

With the T520-SO-CR, Chelsio is enabling a unified wire for LAN, SAN, and cluster traffic. This unified wire was made possible by the high bandwidth and low latency of 10GbE combined with storage and cluster protocols operating over TCP/IP. In parallel, operating systems and hypervisors have incorporated native support for iSCSI and database applications are now supporting file-based storage protocols such as NFS as an alternative to SANs.

T520-SO-CR includes a full-fledged integrated Traffic Manager for robust flow control, traffic management, and QoS.


Fibre Channel over Ethernet (FCoE) provides a transition path from legacy SANs to converged networks. Expanding its unified wire approach, Chelsio has added FCoE hardware support for the adapter.


The adapter’s two ports and IEEE 802.3ad link aggregation/failover features are ideal for critical network applications that require redundancy and high-availability capabilities.


T520-SO-CR Ethernet-only networking reduces the data center’s cost in network adapters, cables, switches, rack space, power, equipment spares, management tools, planning, networking skills and installation.





Host Interface

  • PCI-e Gen 3 x8
  • MSI-X, MSI and support for legacy pin interrupts


UDP & Multicast Offload

  • UDP Sockets API
  • Low user-to-user latency
  • Multicast replication on ingress or egress



  • 128 Virtual and 8 Physical functions
  • 144 port virtual switch
  • EVB, VEPA, Flex10, VNTag
  • 512 virtual MAC addresses
  • Offload 802.1 Qbg/h


TCP/IP Full Offload

  • Full TCP implementation including IPv4 & IPv6
  • Extensive RFC compliance, fully features stack
  • Full TCP Proxy between any set of connections
  • VLAN support up to 4096 VLAN IDs
  • Load balancing and Fail-over capabilities



  • Full iSCSI initiator and target mode stack
  • CRC32 offload generation and verification
  • iSCSI proxy switching based on SCSI CDB
  • T10 DIF/DIX support



  • Full HBA FCoE (Initiator or Target)
  • CRC32 offload generation & verification
  • Ingress & Egress ACL (Access Control List)
  • T10 DIF/DIX support


Stateless Offloads

  • TCP/UDP checksum offload for IPv4 & IPv6
  • TSO, LSO and GSO for IPv4 & IPv6
  • VLAN filtering, insertion & extraction
  • Line rate packet filtering and attack protection
  • Fine granularity time stamping (down to 2ns)
  • Ethernet Routing (packet header rewrite)
  • Packet Tracing and Packet Sniffing



  • IEEE 802.3ae (10GbE)
  • IEEE 802.3az (Energy Efficient Ethernet)
  • IEEE 802.3z (1GbE)
  • IEEE 802.1p priority
  • IEEE 8021Q VLAN tagging
  • IEEE 802.1Qbg EVB/VEPA
  • IEEE 802.Qhn VNTag
  • IEEE 9-2/1Qg/h Congestion Notification
  • IEEE 802.3x flow control
  • IEEE 802.3ad load-balancing and failover
  • Ether II and 802.e encapsulated frames
  • Multiple MAC addresses per interface
  • Jumbo Frames up to 9.6 Kbytes


Operating System Support

  • Linux
  • Windows
  • FreeBSD
  • MacOS (NIC only)
  • Illumos
  • Xen
  • ESX


Physical and Environmental

  • Dimensions without bracket: 6.6 in x 2.71 in or 16.76 cm x 6.88 cm
  • Fully RoHS Compliant
  • Operating Temp: 0oC to 55oC or 32oF to 131oF
  • Operating Humidity: 5 to 95%
  • Airflow: 200 lf/m
  • Typical power consumption: 9 W

Grade info
  • Grade 1 New and Boxed
  • Grade 2 Used, Tested, in Working Order and Good Condition
  • Grade 3 Used, Tested, in Working Order. May have cosmetic scratches or blemishes
  • Grade 4 Used, Passes power up test but unable to test further
  • Grade 5 Used and Untested