One QSFP28 port, running at up to 100Gb as either EDR InfiniBand or 100GbE, since this is a VPI card.

Does it support RDMA and RoCE?

Yes, both RDMA and RoCE, which is the point of a ConnectX-5 VPI card in HPC and storage fabrics.

What cabling does it need?

A QSFP28 direct-attach cable or optic matched to the mode you run. InfiniBand and Ethernet use different fabrics, so decide the mode first, and for InfiniBand you also need an IB switch and subnet manager.

MCX555A-ECAT - Mellanox 1-Port 100Gbs QSFP28 PCIE 3.0 x16 Network Card

Name: MCX555A-ECAT - Mellanox 1-Port 100Gbs QSFP28 PCIE 3.0 x16 Network Card
Brand: Mellanox
SKU: MCX555A-ECAT
Price: 210 USD
Availability: InStock

MCX555A-ECAT - Mellanox 1-Port 100Gbs QSFP28 PCIE 3.0 x16 Network Card | US IT Hardware

Product overview

The Mellanox ConnectX-5 VPI MCX555A-ECAT is a single-port 100Gb adapter with Virtual Protocol Interconnect, meaning the port runs either EDR InfiniBand or 100GbE, selectable per deployment. That flexibility makes it the go-to card for HPC clusters, AI training fabrics and low-latency storage networks where you may standardize on InfiniBand or Ethernet. It uses a QSFP28 connector on PCIe Gen3 x16 with hardware RDMA/RoCE.

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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 #	MCX555A-ECAT
Brand	Mellanox
Condition	Refurbished
Card Height	Low-profile
Product Line	ConnectX-5
Product Type	Network Adapter
Wireless Data Rate	100Gb/s
Technology Standard	100GBase-X
Compliance Standards	RoHS, WEEE
Type of Expansion Slots	QSFP28
Maximum Data Transfer Rate	100
Quantity of Ethernet LAN Ports (RJ-45/SFP/SFP+)	2

Interfaces/Ports

Ports	1x 100Gb
Connector	QSFP28
Host Interface	PCI Express 3.0 x16
Media Standard	Optical Fiber

Management & Protocols

Modes	EDR InfiniBand or 100GbE (VPI)
Offloads	RDMA, RoCE

Physical Characteristics

Form Factor	Plug-in Card

Condition

New and recertified.

Good to know

OEM vs generic: Mellanox/NVIDIA-branded VPI card. We confirm cable/optic compatibility for your chosen mode.
What it needs to link: Decide up front whether the port runs InfiniBand or Ethernet, since the fabric and cabling differ. For InfiniBand you also need an IB switch and subnet manager. Order the matching QSFP28 DAC or optic with the card.

Frequently asked questions

Is it InfiniBand or Ethernet?

Both, selectable (VPI). Choose the mode for your fabric.

Which servers and slots fit it?

Details

Shipping, warranty & returns

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