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Chelsio T580-SO-CR 40 Gigabit Ethernet Adapter Card - Part ID: T580-SO-CR

2-port 10/40GbE Low Profile Server Adapter with PCI-E x8 Gen 3, Stateless Offload. QSFP connector


20 lbs
Ships within 3-5 Days



Availability In stock



High Performance, Dual Port 40GbE Unified Wire Adapter

Enables TCP Offload over Single Unified Wire with SR-IOV, EVB/VNTag, DCB


Chelsio’s T580-SO-CR is a memory free dual-port 40 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 40GbE performance available and dramatically lowers host-system CPU communications overhead with on-board hardware that off-loads TCP/IP processing from its host system. T580-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 T580-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 40GbE 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.

T580-SO-CR includes a full-fledged integrated Traffic Manager for robust flow control, traffic management, and QoS.

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.

T580-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.


  • PCI Express Gen3 x8
  • Low Latency
  • Memory free & up to 32 offloaded connections
  • Full TCP offload
  • EVB, Flex10, VNTag
  • Integrated media streaming offload
  • HW based firewall in the cloud
  • Traffic filtering & management
  • Software Compatible with T4


Data-Center Networking

  • Scale up servers and NAS systems
  • Link servers in multiple facilities to synchronize data centers
  • Consolidate LAN, SAN, and cluster networks

Cloud Computing

  • Virtualization features to maximize cloud scaling and utilization
  • Runs Fibre Channel apps unmodified over Ethernet
  • Cloud ready functional and management features
  • QoS and Traffic management

Networked Storage

  • Enable high performance NAS systems and Ethernet-based IP SANs
  • Develop shared-storage systems providing both file- and block-level services

High Performance Computing

  • Very-low latency Ethernet
  • Increase cluster fabric bandwidth
  • Deploy Ethernet-only networking for cluster fabric, LAN, and SAN

Technical Specification

Host Interface

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

UDP/IP & 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


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


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

TCP/IP Full Offload

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

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 (10 GbE)
  • IEEE 802.3az (Energy Efficient Ethernet)
  • IEEE 802.3z (1 GbE)
  • IEEE 802.1P priority
  • IEEE 802.1Q 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 9.6Kbytes

Physical and Environmental

  • Dimensions without bracket: 6.6 in. x 2.7 in. or 16.76 cm x 6.88 cm
  • Operating Temp: 0 to 55ºC or 32 to 131ºF
  • Operating Humidity: 5 to 95%
  • Airflow: 200 lf/m
  • Typical power consumption: 12W


  • 1-year limited hardware warranty – free repair or replacement for faulty hardware due to Chelsio defect or failure.
  • Extended warranty to 3 years can be purchased within first year.
  • 30 days free technical support, software maintenance & upgrades with the purchase of any Chelsio adapter or software product.

Ordering Info

Model: T580-SO-CR
Physical Interface: 40GBASE-SR4*
Connector: QSFP+
Media: MMF or SMF


SM40G-SR: 40G short-reach QSFP+ optic module
OCTTAPCABLE3M: QSFP+-to-4xSFP+ Twinax Passive Cable
QSRCABLE10M: 10m QSFP+-to-QSFP+ SR Optical Cable
QTAPCABLE1M: 1m QSFP+-to-QSFP+ Twinax Passive Cable
QTAPCABLE3M: 3m QSFP+-to-QSFP+ Twinax Passive Cable
QTAPCABLE5M: 5m QSFP+-to-QSFP+ Twinax Passive Cable


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Memory usage: real: 23592960, emalloc: 23250664
Code ProfilerTimeCntEmallocRealMem