Does it support RDMA and RoCE?

Yes, RoCE v2, which lets storage and HPC traffic move with low latency and little CPU overhead when the fabric is configured for it.

What cabling does it need?

QSFP28 direct-attach copper for in-rack runs, or QSFP28 optics with matching fibre for distance. Order the cable or optic together with the card, since it cannot link without one.

Is it Ethernet or InfiniBand?

Ethernet only. The EN suffix means this card does not run InfiniBand, so if you need a VPI card that does both, ask us for the alternative part.

MCX516A-CCAT - Mellanox ConnectX-4 2-Ports 50Gb/s QSFP28 NIC

Name: MCX516A-CCAT - Mellanox ConnectX-4 2-Ports 50Gb/s QSFP28 NIC
Brand: Mellanox
SKU: MCX516A-CCAT
Price: 335 USD
Availability: InStock

MCX516A-CCAT - Mellanox ConnectX-4 2-Ports 50Gb/s QSFP28 NIC | US IT Hardware

Product overview

The Mellanox ConnectX-5 EN MCX516A-CCAT is a dual-port 100GbE Ethernet adapter, a workhorse of enterprise storage networks and HPC where 100G east-west bandwidth matters. It runs up to 100GbE per port over QSFP28 on a PCIe Gen3 x16 interface, with hardware RoCE v2 for low-latency RDMA storage traffic. As a mature, widely qualified 100G NIC it is a strong value in the refurbished market. The EN suffix means Ethernet only.

Expedited and overnight shipping options are available at checkout, priced by destination and service.
Purchase orders accepted from qualified institutions.
Refunds within 14 days and replacements within 30 days of delivery with an RMA (25% restocking fee on customer-initiated returns), and every part carries our Standard 30-Day Warranty - see our return policy or contact US IT Hardware.

Technical Information

Manufacturer part #	MCX516A-CCAT
Brand	Mellanox
Condition	Refurbished
Product Line	ConnectX-4
Product Type	Network Adapter
Wireless Data Rate	50Gb/s
Technology Standard	100GBase-X
Type of Expansion Slots	QSFP28
Maximum Data Transfer Rate	100
Quantity of Total Networks Ports	2
Quantity of Ethernet LAN Ports (RJ-45/SFP/SFP+)	2-Ports

Interfaces/Ports

Ports	2x 100GbE
Protocol	Ethernet (EN)
Connector	QSFP28
Host Interface	PCI Express 3.0 x16
Media Standard	Optical Fiber

Management & Protocols

Offloads	RoCE v2

Physical Characteristics

Form Factor	Plug-in Card

Condition

New and recertified.

Good to know

OEM vs generic: Mellanox/NVIDIA-branded part. We confirm whether a generic-coded cable or optic will link on your switch.
What it needs to link: QSFP28 DAC for in-rack, or QSFP28 optics with matching fibre for distance. Order the cable or optic with the card. Use a PCIe Gen3 x16 slot for full bandwidth.

Frequently asked questions

Which servers and slots fit it?

Servers with a PCIe Gen3 x16 slot; confirm by model. Send us your server model and we will confirm fit before you order.

Mellanox ConnectX-4 2-Ports 50Gb/s QSFP28 NIC