MCX4121A-ACAT is the exact legacy OPN for an NVIDIA ConnectX-4 Lx EN Ethernet adapter with two 25GbE SFP28 ports and a PCIe 3.0 x8 host interface. NVIDIA maps this exact OPN to SKU 900-9X4B0-0053-0T1; buyers should not confuse ACAT with the separately listed MCX4121A-ACUT UEFI-enabled variant. Because NVIDIA marks the ConnectX-4 Lx product line end-of-life, exact OPN verification matters for installed-base spares and legacy procurement; current availability is confirmed by RFQ.
Exact identifiers
Legacy OPNMCX4121A-ACAT
NVIDIA SKU900-9X4B0-0053-0T1
Verified technical specifications
Protocol
ethernet
Maximum network speed
25 Gb/s
Port count
2
Port type
SFP28
PCIe generation
PCIe 3.0
PCIe lanes
x8
Lifecycle & procurement context
Manufacturer lifecycle: Discontinued / EOL
NVIDIA's exact ordering table lists MCX4121A-ACAT as the standard 25GbE dual-port SFP28 PCIe 3.0 x8 variant and lists MCX4121A-ACUT separately with UEFI enabled.
Lifecycle is manufacturer product status, not a statement of current stock. Availability and price are confirmed by RFQ.
Verified Manufacturer & OEM Sources
Official manufacturer or OEM technical sources supporting the product identity and facts shown here. These sources establish product facts; they are separate from YOSHI material inspection.
