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Green printed circuit board with two SFP28 cages and a gold PCI Express 3.0 x8 edge connector

Chelsio Communications

Chelsio Communications T6225-CR 25GbE dual-port network card

SKU CH-VE3W-257G2 MPN T6225-CR

Dual-port 25GbE SFP28 server adapter with PCIe 3.0 x8 and crypto offload

  • Speed10Gbps
  • InterfacePCI Express 3.0 x8
  • FeaturesProduct Type:10Gigabit Ethernet Card
  • Dual 25GbE ports accelerate storage and cloud workloads
  • PCI Express 3.0 x8 interface delivers high host throughput
  • Unified Wire offloads IPsec, TLS, DTLS and SMB crypto
  • Sub-microsecond latency reduces CPU overhead in datacenters
  • RoHS-certified 2.7" plug-in card fits server chassis

Dual-port 25GbE server adapter

The Chelsio T6225-CR is a dual-port 10/25Gb Ethernet Unified Wire Adapter built for servers. It connects through a PCI Express 3.0 x8 slot and uses SFP28 cages for optical fiber links. The card targets storage, cloud, HPC and virtualization workloads where consistent throughput matters. RoHS compliance confirms environmentally responsible manufacturing.

Sustained offload performance

Hardware offload handles IPsec, TLS/SSL, DTLS and SMB 3.x crypto without host CPU involvement. Standard TCP, IP and UDP protocol processing is also moved to the adapter, keeping latency in the sub-microsecond range under continuous load. This reduces CPU acquisition, power and operational costs while maintaining throughput during long transfers.

Compatibility checklist

Verify the server has a free PCI Express 3.0 x8 slot and adequate bracket clearance for a 2.7-height plug-in card. Confirm SFP28 optics or cables matching 25GBase-SR or 25GBase-LR are available for the intended link distance. Ensure the operating environment supports the required driver stack for Unified Wire features.

Highlights

  • Dual 25GbE ports accelerate storage and cloud workloads
  • PCI Express 3.0 x8 interface delivers high host throughput
  • Unified Wire offloads IPsec, TLS, DTLS and SMB crypto
  • Sub-microsecond latency reduces CPU overhead in datacenters
  • RoHS-certified 2.7" plug-in card fits server chassis

Specifications

BrandChelsio
ModelT6225-CR
Speed10Gbps
InterfacePCI Express 3.0 x8
FeaturesProduct Type:10Gigabit Ethernet Card
Shipping weight0.91 kg
Package size251 × 168 × 56 mm

Questions about this item

How much heat does the T6225-CR generate when running 25 GbE traffic all day?

The card draws power through the PCI Express 3.0 x8 slot and has no onboard fan, so case airflow must handle the heat produced at 10 Gbps or 25 Gbps line rate.

Which SFP28 modules or cables must I already own to use the dual ports?

Each of the two SFP28 cages accepts 25GBase-SR, 25GBase-LR or compatible direct-attach cables, so you need two matching transceivers or DACs for full dual-port operation.

Will the T6225-CR work in a server that only has PCI Express 2.0 x8 slots?

The adapter requires a PCI Express 3.0 x8 host interface; it will not negotiate down to 2.0 speeds, so the server must provide a 3.0 x8 slot.

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