AOC-MCX456A-ECAT: Supermicro AOC-MCX456A-ECAT: 2 Port 100G QSFP28 PCI-E x16 EDR IB card, based on Mellanox ConnectX-4 VPI

Supermicro AOC-MCX456A-ECAT is listed as Supermicro AOC-MCX456A-ECAT: 2 Port 100G QSFP28 PCI-E x16 EDR IB card, based on Mellanox ConnectX-4 VPI. It is a network adapter that the vendor documents for Supermicro SYS-4029GP-TRT show as an orderable option. Check the exact model and generation before buying, because option lists differ between product generations.

Specifications

About the AOC-MCX456A-ECAT

Supermicro AOC-MCX456A-ECAT: 2 Port 100G QSFP28 PCI-E x16 EDR IB card, based on Mellanox ConnectX-4 VPI is sold by Supermicro under product ID AOC-MCX456A-ECAT. It is a network adapter in the Supermicro option range and appears in the ordering or configuration tables of the vendor documents cited in the sources. The product ID is the number brokers and buyers search for, so match it exactly rather than by capacity or description alone.

Compatibility

The Supermicro documents cited in the sources list AOC-MCX456A-ECAT as an option for Supermicro SYS-4029GP-TRT. That listing is the only compatibility claim recorded here: the part is not assumed to fit other generations or other product lines of the same brand. Firmware, software, slot, backplane and controller requirements are set out in the vendor documentation for the specific product, and the vendor's compatibility tool should be checked before ordering a second-hand unit.

Buying used

Check the product ID on the label, the port count and speed, and that the bracket suits the chassis. Optical ports need compatible transceivers or cables, which are usually sold separately. Ask the seller for photos of the part number label, confirm the return terms, and test the part in a running system before accepting it. Prices vary with condition, so compare several listings for the exact product ID.

Fits these models

• Supermicro GPU SuperServer SYS-4029GP-TRT

Works together

How the Supermicro AOC-MCX456A-ECAT connects to servers, storage and the network: 2 ways, with the hardware on each path.

Plan and size it

• Draw this setup in the topology planner mrplanb.com
• Tokens per kWh calculator for GPU racks rack-density.com
• Add up rack power and space rack-density.com
• Power, cooling and racks for dense GPU servers mrplanb.com

Check compatibility with Supermicro

Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that Supermicro has tested with the Supermicro AOC-MCX456A-ECAT.

• Compatibility Supermicro tested memory, drives and add-on cards (per system page)
• Support Supermicro Support

Sources

• Supermicro SYS-4029GP-TRT product page, checked 2026-10-28