Mellanox MCX4121A-ACUT ConnectX Dual Ports 10/25GbE SFP28 PCI Express 3.0 x8 Network Adapter Card. Refurbished. In Stock Brand: Mellanox Part Number: MCX4121A-ACUT Condition: Refurbished Category: Transceiver Key Specs: 25GbE Availability: In Stock Shipping: Fast US-based shipping Order the Mellanox MCX4121A-ACUT today from ProDisk Network — your trusted source for enterprise IT hardware. All products are quality-tested and backed by our support team.
The MCX4121A-ACUT is a Mellanox transceiver component with interface PCI Express, network speed 25 GbE, features SFP28. Pro Disk Network sells the MCX4121A-ACUT for $75.79 with same-day US shipping and a 30-day return guarantee.
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Reviewed by:Pro Disk Network Engineering Team — . Specifications, compatibility, and pricing for the MCX4121A-ACUT are shown on this page.
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Quick Answer: Is the MCX4121A-ACUT compatible with my switch?
Pro Disk Network validates every MCX4121A-ACUT against the target switch's published compatibility matrix before shipment. If you let us know your switch model and firmware version, we will confirm fitment and code the module appropriately (Cisco-coded, Juniper-coded, HPE-coded, etc.) at no extra charge.
How fast does the MCX4121A-ACUT ship?
Pro Disk Network dispatches the MCX4121A-ACUT same-day on orders confirmed before 3 pm ET. Multi-pallet projects requiring crating ship within 2 business days. International shipping (Canada, Mexico, EU, APAC) takes 3-7 business days via DHL Express or FedEx International Priority.
The MCX4121A-ACUT is deployed by US enterprises, MSPs, government, and education customers across multiple infrastructure scenarios. Below are the most common deployment patterns Pro Disk Network sees in real-world orders.
DCI (Data Center Interconnect) — Inter-DC routing or aggregation. LR4/LR8 transceivers for 10–80 km, ER4 for 40 km, ZR4 for coherent long-haul.
Campus Distribution — Catalyst-class campus distribution between IDF and MDF closets. PoE+ where wireless APs and IP phones share infrastructure.
Branch / Edge — Smaller form-factor switches and routers for branch sites. SD-WAN-compatible or static-VPN-attached as the architecture dictates.
What is the MCX4121A-ACUT?
The MCX4121A-ACUT is a Mellanox network interface module with interface PCI Express and network speed 25 GbE, manufactured by Mellanox. Pro Disk Network ships this part new and certified-refurbished from our US warehouse with same-day dispatch on orders placed before 3 PM ET, backed by a 30-day return guarantee.
Pros & Cons of MCX4121A-ACUT
Pros
Matched-pair option for redundant link orders
Cabling and DAC/AOC labels clearly mark optic class
Cons
Refurbished switches may show minor rack-rail wear
Power supplies sold separately on certain SKUs
Long-haul ZR4/CFP4 modules subject to export-control screening
Frequently Asked Questions about MCX4121A-ACUT
Is the MCX4121A-ACUT a genuine Mellanox part?
Yes. Pro Disk Network sources every MCX4121A-ACUT as factory-original Mellanox inventory. New units arrive sealed in OEM packaging; refurbished units are pulled from decommissioned Mellanox servers, surface-tested, and re-warranted by Pro Disk Network for 90 days.
Is the MCX4121A-ACUT compatible with my switch?
Pro Disk Network validates every MCX4121A-ACUT against the target switch's published compatibility matrix before shipment. If you let us know your switch model and firmware version, we will confirm fitment and code the module appropriately (Cisco-coded, Juniper-coded, HPE-coded, etc.) at no extra charge.
How fast does the MCX4121A-ACUT ship?
Pro Disk Network dispatches the MCX4121A-ACUT same-day on orders confirmed before 3 pm ET. Multi-pallet projects requiring crating ship within 2 business days. International shipping (Canada, Mexico, EU, APAC) takes 3-7 business days via DHL Express or FedEx International Priority.
What is the warranty on the MCX4121A-ACUT?
New MCX4121A-ACUT units carry the full Mellanox manufacturer warranty (typically 1 to 5 years depending on product line). Refurbished and bulk-OEM units include a Pro Disk Network advance-replacement warranty (90 days refurbished). DOA replacement is free within 30 days of receipt.
Do you offer bulk pricing for the MCX4121A-ACUT?
Email sales@prodisknetwork.com with the quantity and target ship date for a quote within one business day.
Optic Coding, Vendor Lock-In, and Multi-Vendor Compatibility
If you are running a multi-vendor leaf-spine architecture (Arista leaves and Cisco spines, for example), order optics coded for each endpoint separately. Optics in DAC and AOC cables are factory-coded to each end and cannot be flashed in-field. Plan the coding split at design time and document it in your network drawings.
Bandwidth Sizing for Spine-Leaf, EVPN-VXLAN, and Hyperconverged Storage
Sizing network bandwidth for a leaf-spine fabric using the MCX4121A-ACUT starts with the workload mix. For general-purpose virtualisation, plan 10G server-to-leaf, 25G or 40G leaf-to-spine; oversubscription up to 4:1 is acceptable. For hyperconverged storage (vSAN, Ceph, Storage Spaces Direct), plan 25G server-to-leaf at minimum, 100G leaf-to-spine, oversubscription 1.5:1 maximum. East-west traffic dominates in HCI clusters and starves on oversubscribed fabrics.