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Mellanox ConnectX-4 (MCX4121A-ACAT) Dual-Port Network Adapter Card

5.07 product ratings
dwet7779 (0)
Price:
$59.99
Free shipping
Estimated delivery Wed, Sep 10 - Wed, Sep 17
Returns:
30 days returns. Seller pays for return shipping.
Condition:
New
The Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port SFP28 Network Interface Card is a high-performance network adapter that provides dual 25 Gbps SFP28 ports for Ethernet connectivity. With a compact form factor and compatibility with PCI Express ports, this card offers fast and reliable networking capabilities. Manufactured by Mellanox, a trusted brand in networking components, this product comes with a 1-year warranty and is designed for optimal performance in a variety of networking setups. Ideal for professionals looking to enhance their computer networking capabilities, the Mellanox MCX4121A-ACAT is a top choice for those seeking high-speed and efficient network connectivity.

About this product

Product Identifiers

BrandMellanox
MPNMCX4121A-ACAT
ModelMellanox ConnectX-4
eBay Product ID (ePID)17055317062

Product Key Features

External InterfacesRJ-45, Ethernet/ Network Cards, Ethernet (RJ-45), PC Card (PCMCIA) Type I
Form FactorNetwork Adapter
Number of Ports2 Ports
TypeNetwork Adapter
Compatible PortPCI Express, PCI Express x8

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ConnectX-4 25GbE Mellanox MCX4121A-ACAT Dual-Port SFP28 Network Interface Card
item 1 ConnectX-4 25GbE Mellanox MCX4121A-ACAT Dual-Port SFP28 Network Interface Card
$48.99
Free shipping
Mellanox ConnectX-4 Lx 25GbE Dual-Port Ethernet Adapter CX4121A MCX4121A-ACAT
item 2 Mellanox ConnectX-4 Lx 25GbE Dual-Port Ethernet Adapter CX4121A MCX4121A-ACAT
$49.99
Free shipping
Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port SFP28 Network Interface Card
item 3 Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port SFP28 Network Interface Card
$59.99
Free shipping
MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
item 4 MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
$57.00
+$3.00 shipping
MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
item 5 MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
$58.70
+$3.00 shipping
MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
item 6 MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
$58.70
+$3.00 shipping
New MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
item 7 New MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
$58.70
+$3.00 shipping
Mellanox ConnectX-4 25GbE Dual-Port MCX4121A-ACAT CX4121A Network Interface Card
item 8 Mellanox ConnectX-4 25GbE Dual-Port MCX4121A-ACAT CX4121A Network Interface Card
$57.95
+$5.00 shipping
CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
item 9 CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
$57.95
+$5.00 shipping
Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port SFP28 Network Interface Card
item 10 Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port SFP28 Network Interface Card
$57.95
+$5.00 shipping
CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
item 11 CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
$57.95
+$5.00 shipping
Mellanox ConnectX-4 CX4121A MCX4121A-ACAT Lx 25GbE SFP28 PCIe Ethernet Adapter
item 12 Mellanox ConnectX-4 CX4121A MCX4121A-ACAT Lx 25GbE SFP28 PCIe Ethernet Adapter
$58.90
+$5.00 shipping
CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
item 13 CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
$58.90
+$5.00 shipping
Mellanox Connect-X-4 MCX4121A-ACAT CX4121A 25GbE Network Interface Card
item 14 Mellanox Connect-X-4 MCX4121A-ACAT CX4121A 25GbE Network Interface Card
$58.90
+$5.00 shipping
Genuine CX4121A MCX4121A-ACAT Mellanox ConnectX-4 25GbE PCIe Ethernet Adapter
item 15 Genuine CX4121A MCX4121A-ACAT Mellanox ConnectX-4 25GbE PCIe Ethernet Adapter
$58.90
+$5.00 shipping
Genuine CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE PCIe Ethernet Adapter
item 16 Genuine CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE PCIe Ethernet Adapter
$58.90
+$5.00 shipping
Mellanox ConnectX-4 CX4121A Genuine MCX4121A-ACAT Lx 25GbE PCIe Ethernet Adapter
item 17 Mellanox ConnectX-4 CX4121A Genuine MCX4121A-ACAT Lx 25GbE PCIe Ethernet Adapter
$58.90
+$5.00 shipping
CX4121A Mellanox ConnectX-4 Genuine MCX4121A-ACAT Lx 25GbE PCIe Ethernet Adapter
item 18 CX4121A Mellanox ConnectX-4 Genuine MCX4121A-ACAT Lx 25GbE PCIe Ethernet Adapter
$58.90
+$5.00 shipping
CX4121A Mellanox ConnectX-4 Lx 25GbE PCIe Genuine MCX4121A-ACAT Ethernet Adapter
item 19 CX4121A Mellanox ConnectX-4 Lx 25GbE PCIe Genuine MCX4121A-ACAT Ethernet Adapter
$58.90
+$5.00 shipping
Mellanox ConnectX-4 MCX4121A-ACAT CX4121A 25GbE SFP28 PCIe Ethernet Adapter 2023
item 20 Mellanox ConnectX-4 MCX4121A-ACAT CX4121A 25GbE SFP28 PCIe Ethernet Adapter 2023
$58.90
+$5.00 shipping
MCX4121A-ACAT Mellanox ConnectX-4 CX4121A 25GbE SFP28 PCIe Ethernet Adapter 2023
item 21 MCX4121A-ACAT Mellanox ConnectX-4 CX4121A 25GbE SFP28 PCIe Ethernet Adapter 2023
$58.90
+$5.00 shipping
MCX4121A-ACAT Mellanox ConnectX-4 Lx CX4121A 25GbE SFP28 PCIe Ethernet Adapter
item 22 MCX4121A-ACAT Mellanox ConnectX-4 Lx CX4121A 25GbE SFP28 PCIe Ethernet Adapter
$58.90
+$5.00 shipping
CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
item 23 CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
$58.90
+$5.00 shipping
CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
item 24 CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
$58.90
+$5.00 shipping
MCX4121A-ACAT Mellanox ConnectX-4 2-Port 25Gbps PCI-e SFP28 Network Adapter
item 25 MCX4121A-ACAT Mellanox ConnectX-4 2-Port 25Gbps PCI-e SFP28 Network Adapter
$66.00
Free shipping
Mellanox | MCX4121A-ACAT | Connect-4 Lx 25GbE with 1U 1Slot PCI-E RISER
item 26 Mellanox | MCX4121A-ACAT | Connect-4 Lx 25GbE with 1U 1Slot PCI-E RISER
$69.00
Free shipping
** MCX4121A-ACAT Mellanox ConnectX-4 2-Ports SFP28 25Gb PCI-E Network Adapter **
item 27 ** MCX4121A-ACAT Mellanox ConnectX-4 2-Ports SFP28 25Gb PCI-E Network Adapter **
$69.99
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** Mellanox ConnectX-4 2-Ports SFP28 25Gb PCI-E Network Adapter MCX4121A-ACAT **
Last one
item 28 ** Mellanox ConnectX-4 2-Ports SFP28 25Gb PCI-E Network Adapter MCX4121A-ACAT **
$69.99
Free shipping
Mellanox MCX4121A-ACAT CX4121A ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
item 29 Mellanox MCX4121A-ACAT CX4121A ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
$65.88
+$10.00 shipping
Mellanox CX4121A MCX4121A-ACAT ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
item 30 Mellanox CX4121A MCX4121A-ACAT ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
$65.99
+$10.00 shipping
Mellanox CX4121A MCX4121A-ACAT ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
item 31 Mellanox CX4121A MCX4121A-ACAT ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
$65.99
+$10.00 shipping
Mellanox CX4121A MCX4121A-ACAT ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
item 32 Mellanox CX4121A MCX4121A-ACAT ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
$65.99
+$10.00 shipping
Genuine Mellanox ConnectX-4 25GbE Dual-Port MCX4121A-ACAT CX4121A NIC
item 33 Genuine Mellanox ConnectX-4 25GbE Dual-Port MCX4121A-ACAT CX4121A NIC
$72.99
+$5.00 shipping
🔥🔥🔥 MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE 2 Port SFP28 Network card
item 34 🔥🔥🔥 MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE 2 Port SFP28 Network card
$79.00
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MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network card
item 35 MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network card
$80.00
Free shipping
MCX4121A-ACAT Mellanox ConnectX-4 25G Ethernet Adapter SFP28 HUAWEI 5M AOC
item 36 MCX4121A-ACAT Mellanox ConnectX-4 25G Ethernet Adapter SFP28 HUAWEI 5M AOC
$76.00
+$5.00 shipping
CX4121A MCX4121A-ACAT Mellanox ConnectX-4 25G Ethernet Adapter SFP28 5M AOC PCIe
item 37 CX4121A MCX4121A-ACAT Mellanox ConnectX-4 25G Ethernet Adapter SFP28 5M AOC PCIe
$76.00
+$5.00 shipping
MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network card
item 38 MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network card
$79.88
+$5.00 shipping
Genuine Mellanox ConnectX-4 Dual Port 25G CX4121A MCX4121A-ACAT SFP28 NIC
item 39 Genuine Mellanox ConnectX-4 Dual Port 25G CX4121A MCX4121A-ACAT SFP28 NIC
$79.99
+$5.00 shipping
Geunine Mellanox ConnectX-4 CX4121A MCX4121A-ACAT 25GbE Network interface card
item 40 Geunine Mellanox ConnectX-4 CX4121A MCX4121A-ACAT 25GbE Network interface card
$77.20
+$15.50 shipping
MCX4121A-ACAT MELLANOX CX4121A CONNECTX-4 25GbE DP SFP28 PCIE 3.0 NETWORK CARD
item 41 MCX4121A-ACAT MELLANOX CX4121A CONNECTX-4 25GbE DP SFP28 PCIE 3.0 NETWORK CARD
$95.00
Free shipping
MCX4121A-ACAT MELLANOX CX4121A CONNECTX-4 25GbE DP SFP28 PCIE 3.0 NETWORK CARD
item 42 MCX4121A-ACAT MELLANOX CX4121A CONNECTX-4 25GbE DP SFP28 PCIE 3.0 NETWORK CARD
$99.99
Free shipping
MCX4121A-ACAT CX4121A Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
item 43 MCX4121A-ACAT CX4121A Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
$106.88
+$5.00 shipping
Mellanox ConnectX-4 Dual Port 25G CX4121A MCX4121A-ACAT SFP28 MMA2P00-AS NIC
item 44 Mellanox ConnectX-4 Dual Port 25G CX4121A MCX4121A-ACAT SFP28 MMA2P00-AS NIC
$119.70
+$5.00 shipping
Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port SFP28 Network Interface Card
item 45 Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port SFP28 Network Interface Card
$92.58
+$35.00 shipping
Mellanox CX4121A Connect X-4 MCX4121A ACAT Dual Port SFP28 PCIe x8 3.0 25G NIC
item 46 Mellanox CX4121A Connect X-4 MCX4121A ACAT Dual Port SFP28 PCIe x8 3.0 25G NIC
$88.34
+$44.75 shipping
Mellanox ConnectX-4 MCX4121A-ACAT Dual-Port Network Adapter Card with SFP's USA!
item 47 Mellanox ConnectX-4 MCX4121A-ACAT Dual-Port Network Adapter Card with SFP's USA!
$139.98
Free shipping
Mellanox CX4121A MCX4121A-ACAT ConnectX-4 Lx 25GbE SFP28 MMA2P00-AS Network Card
item 48 Mellanox CX4121A MCX4121A-ACAT ConnectX-4 Lx 25GbE SFP28 MMA2P00-AS Network Card
$159.00
+$5.00 shipping
Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port SFP28 Network Interface Card
item 49 Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port SFP28 Network Interface Card
$168.88
+$150.00 shipping
MCX4121A-ACAT Brand New Mellanox MCX4121A-ACAT Fast Shipping Via FedEx or DHL
item 50 MCX4121A-ACAT Brand New Mellanox MCX4121A-ACAT Fast Shipping Via FedEx or DHL
$817.30
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Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port Network Interface Card
item 51 Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port Network Interface Card
$54.99
Mellanox ConnectX-4 Lx EN 25GbE (MCX4121A-ACAT) Dual-Port SFP28 Network Card
item 52 Mellanox ConnectX-4 Lx EN 25GbE (MCX4121A-ACAT) Dual-Port SFP28 Network Card
$70.00
MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network card
Last one
item 53 MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network card
$89.00
I MCX4121A-ACAT MELLANOX CX4121A CONNECTX-4 25GbE DP SFP28 PCIE 3.0 NETWORK CARD
item 54 I MCX4121A-ACAT MELLANOX CX4121A CONNECTX-4 25GbE DP SFP28 PCIE 3.0 NETWORK CARD
$90.00
Mellanox MCX4121A-ACAT CONNECTX-4 DUAL PORT 25GB ETHERNET vt
item 55 Mellanox MCX4121A-ACAT CONNECTX-4 DUAL PORT 25GB ETHERNET vt
$175.00
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5.0
7 product ratings
  • 7 users rated this 5 out of 5 stars
  • 0 users rated this 4 out of 5 stars
  • 0 users rated this 3 out of 5 stars
  • 0 users rated this 2 out of 5 stars
  • 0 users rated this 1 out of 5 stars

Would recommend

Good value

Good quality

Most relevant reviews

  • by hi-networks
    Nov 08, 2024

    It's working on my QNAP TS-464.

    I am using it with my QNAP TS-464. It works perfectly. I am getting transfer speeds of close to 10Gbps, at less than half the price of genuine QNAP products.

    Verified purchase: YesCondition: New

  • by gritz1975
    Aug 30, 2024

    Powerful, yet not expensive.

    I bought 2, for Proxmox and Truenas. In a direct connection between the two I managed to get around 2GB/s transfer rates. Depending on your hardware and tuning of course.

    Verified purchase: YesCondition: Pre-owned

  • by d6zilcv5shy@deleted
    Mar 15, 2019

    good condition & performance

    1.very good condition, like a new card. 2.good performance, up to 25Gb/s.

    Verified purchase: YesCondition: Pre-owned

  • by olehenrikj
    Aug 01, 2025

    Worked without issues in my Unraid serve...

    Worked without issues in my Unraid server, using 10GbE.

    Verified purchase: YesCondition: New

  • by awake666
    Oct 21, 2024

    very good

    It's a very good product

    Verified purchase: YesCondition: Pre-owned

  • by ghan_04
    Dec 01, 2024

    All NICs included both brackets and work...

    All NICs included both brackets and worked as expected.

    Verified purchase: YesCondition: Pre-owned

  • by lbulej
    Jul 06, 2025

    Perfect compatibility with Linux and Win...

    Perfect compatibility with Linux and Windows.

    Verified purchase: YesCondition: New

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