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

5.07 product ratings
servercompo (679)
100% positive feedback
Price:
US $39.95
ApproximatelyC $54.90
+ $11.92 shipping
Estimated delivery Wed, Aug 20 - Fri, Aug 29
Returns:
30 days return. Buyer pays for return shipping. If you use an eBay shipping label, it will be deducted from your refund amount.
Condition:
New

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
C $67.32
Free shipping
Mellanox MCX4121A-ACAT OEM Long Profile Bracket and Card Storage Clamshell Case
item 2 Mellanox MCX4121A-ACAT OEM Long Profile Bracket and Card Storage Clamshell Case
C $54.90
+C $16.38 shipping
Mellanox MCX4121A-ACAT OEM Low Profile Bracket and Card Storage Clamshell Case
item 3 Mellanox MCX4121A-ACAT OEM Low Profile Bracket and Card Storage Clamshell Case
C $54.90
+C $16.38 shipping
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item 4 HP MCX4121A 640SFP 840140 817753-B21 817751-001 25GbE 2-Port SFP28 Network card
C $75.05
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item 5 HP MCX4121A 640SFP 840140 817753-B21 817751-001 25GbE 2-Port SFP28 Network card
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item 6 CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx SFP28 25GbE PCIe Ethernet Adapter
C $76.37
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MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
item 7 MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
C $78.32
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MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
item 8 MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
C $78.32
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item 9 Mellanox ConnectX-4 25GbE Dual-Port MCX4121A-ACAT CX4121A Network Interface Card
C $79.63
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item 10 CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
C $79.63
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item 11 Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port SFP28 Network Interface Card
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CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
item 12 CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
C $79.63
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Mellanox MCX4121A-ACAT CX4121A ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
item 13 Mellanox MCX4121A-ACAT CX4121A ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
C $80.65
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Mellanox ConnectX-4 CX4121A Genuine MCX4121A-ACAT Lx 25GbE PCIe Ethernet Adapter
item 14 Mellanox ConnectX-4 CX4121A Genuine MCX4121A-ACAT Lx 25GbE PCIe Ethernet Adapter
C $80.93
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CX4121A Mellanox ConnectX-4 Genuine MCX4121A-ACAT Lx 25GbE PCIe Ethernet Adapter
item 15 CX4121A Mellanox ConnectX-4 Genuine MCX4121A-ACAT Lx 25GbE PCIe Ethernet Adapter
C $80.93
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item 16 CX4121A Mellanox ConnectX-4 Lx 25GbE PCIe Genuine MCX4121A-ACAT Ethernet Adapter
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item 17 Mellanox ConnectX-4 MCX4121A-ACAT CX4121A 25GbE SFP28 PCIe Ethernet Adapter 2023
C $80.93
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MCX4121A-ACAT Mellanox ConnectX-4 CX4121A 25GbE SFP28 PCIe Ethernet Adapter 2023
item 18 MCX4121A-ACAT Mellanox ConnectX-4 CX4121A 25GbE SFP28 PCIe Ethernet Adapter 2023
C $80.93
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MCX4121A-ACAT Mellanox ConnectX-4 Lx CX4121A 25GbE SFP28 PCIe Ethernet Adapter
item 19 MCX4121A-ACAT Mellanox ConnectX-4 Lx CX4121A 25GbE SFP28 PCIe Ethernet Adapter
C $80.93
Free shipping
CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
item 20 CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
C $80.93
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CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
item 21 CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
C $80.93
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item 22 Mellanox ConnectX-4 CX4121A MCX4121A-ACAT Lx 25GbE SFP28 PCIe Ethernet Adapter
C $80.93
Free shipping
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item 23 CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
C $80.93
Free shipping
Mellanox Connect-X-4 MCX4121A-ACAT CX4121A 25GbE Network Interface Card
item 24 Mellanox Connect-X-4 MCX4121A-ACAT CX4121A 25GbE Network Interface Card
C $80.93
Free shipping
Genuine CX4121A MCX4121A-ACAT Mellanox ConnectX-4 25GbE PCIe Ethernet Adapter
item 25 Genuine CX4121A MCX4121A-ACAT Mellanox ConnectX-4 25GbE PCIe Ethernet Adapter
C $80.93
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Mellanox CX4121A MCX4121A-ACAT ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
item 26 Mellanox CX4121A MCX4121A-ACAT ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
C $82.43
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Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port SFP28 Network Interface Card
item 27 Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port SFP28 Network Interface Card
C $82.43
Free shipping
Mellanox Technologies CX4121A-ACAT 25GbE ConnectX-4 2Port Network Card Low Prof
item 28 Mellanox Technologies CX4121A-ACAT 25GbE ConnectX-4 2Port Network Card Low Prof
C $61.82
+C $22.14 shipping
New MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
item 29 New MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
C $84.51
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MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
item 30 MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network Card
C $84.92
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Genuine CX4121A MCX4121A-ACAT Mellanox ConnectX-4 25GbE PCIe Ethernet Adapter
item 31 Genuine CX4121A MCX4121A-ACAT Mellanox ConnectX-4 25GbE PCIe Ethernet Adapter
C $80.87
+C $5.50 shipping
Genuine Mellanox MCX4121A-ACAT ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
item 32 Genuine Mellanox MCX4121A-ACAT ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
C $94.80
Free shipping
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item 33 Mellanox MCX4121A-ACAT CX4121A ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
C $96.02
Free shipping
Genuine MCX4121A-ACAT Mellanox ConnectX-4 Lx CX4121A 25GbE SFP28 PCIe Adapter
item 34 Genuine MCX4121A-ACAT Mellanox ConnectX-4 Lx CX4121A 25GbE SFP28 PCIe Adapter
C $96.17
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item 35 Genuine Mellanox ConnectX-4 MCX4121A-ACAT CX4121A 25GbE SFP28Ethernet Adapter
C $96.17
Free shipping
Genuine Mellanox ConnectX-4 25GbE Dual-Port MCX4121A-ACAT CX4121A NIC
item 36 Genuine Mellanox ConnectX-4 25GbE Dual-Port MCX4121A-ACAT CX4121A NIC
C $100.30
Free shipping
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item 37 Mellanox CX4121A MCX4121A-ACAT ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
C $96.17
+C $5.50 shipping
Mellanox CX4121A MCX4121A-ACAT ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
item 38 Mellanox CX4121A MCX4121A-ACAT ConnectX-4 25Gigabit Ethernet Card PCI-E 3.0
C $96.17
+C $6.87 shipping
Genuine Mellanox MCX4121A-ACAT ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
item 39 Genuine Mellanox MCX4121A-ACAT ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
C $103.95
Free shipping
MCX4121A-ACAT Mellanox ConnectX-4 25G Ethernet Adapter SFP28 HUAWEI 5M AOC
item 40 MCX4121A-ACAT Mellanox ConnectX-4 25G Ethernet Adapter SFP28 HUAWEI 5M AOC
C $104.43
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CX4121A MCX4121A-ACAT Mellanox ConnectX-4 25G Ethernet Adapter SFP28 5M AOC PCIe
item 41 CX4121A MCX4121A-ACAT Mellanox ConnectX-4 25G Ethernet Adapter SFP28 5M AOC PCIe
C $104.43
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item 42 Mellanox MCX4121A-ACAT 25GbE NIC Compatible AOC & Modules SFP-25G-AOC-5M HUAWEI
C $104.43
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Genuine Mellanox ConnectX-4 MCX4121A-ACAT CX4121A 25GbE SFP28Ethernet Adapter
item 43 Genuine Mellanox ConnectX-4 MCX4121A-ACAT CX4121A 25GbE SFP28Ethernet Adapter
C $105.46
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Genuine MCX4121A-ACAT Mellanox ConnectX-4 Lx CX4121A 25GbE SFP28 PCIe Adapter
item 44 Genuine MCX4121A-ACAT Mellanox ConnectX-4 Lx CX4121A 25GbE SFP28 PCIe Adapter
C $105.46
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Mellanox MCX4121A-ACAT ConnectX-4 CX4121A Dual-Port 25GB SFP28 PCIe NIC - Used
item 45 Mellanox MCX4121A-ACAT ConnectX-4 CX4121A Dual-Port 25GB SFP28 PCIe NIC - Used
C $68.71
Geunine Mellanox ConnectX-4 CX4121A MCX4121A-ACAT 25GbE Network interface card
item 46 Geunine Mellanox ConnectX-4 CX4121A MCX4121A-ACAT 25GbE Network interface card
C $106.08
+C $2.75 shipping
Genuine Mellanox ConnectX-4 25GbE Dual-Port MCX4121A-ACAT CX4121A NIC
item 47 Genuine Mellanox ConnectX-4 25GbE Dual-Port MCX4121A-ACAT CX4121A NIC
C $109.98
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MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network card
item 48 MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network card
C $109.76
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Genuine Mellanox ConnectX-4 Dual Port 25G CX4121A MCX4121A-ACAT SFP28 NIC
item 49 Genuine Mellanox ConnectX-4 Dual Port 25G CX4121A MCX4121A-ACAT SFP28 NIC
C $109.91
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MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network card
item 50 MCX4121A-ACAT Mellanox CX4121A ConnectX-4 25GbE Dual-Port SFP28 Network card
C $109.93
Free shipping
Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port Network Interface Card
item 51 Mellanox MCX4121A-ACAT ConnectX-4 25GbE Dual-Port Network Interface Card
C $75.56
Genuine Mellanox ConnectX-4 Dual Port 25G CX4121A MCX4121A-ACAT SFP28 NIC
item 52 Genuine Mellanox ConnectX-4 Dual Port 25G CX4121A MCX4121A-ACAT SFP28 NIC
C $120.53
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Mellanox ConnectX-4 Lx EN 25GbE (MCX4121A-ACAT) Dual-Port SFP28 Network Card
item 53 Mellanox ConnectX-4 Lx EN 25GbE (MCX4121A-ACAT) Dual-Port SFP28 Network Card
C $96.19
MCX4121A-ACAT Mellanox ConnectX-4 2-Port 25Gbps PCI-e SFP28 Network Adapter
item 54 MCX4121A-ACAT Mellanox ConnectX-4 2-Port 25Gbps PCI-e SFP28 Network Adapter
C $102.85
+C $22.88 shipping
Genuine Mellanox ConnectX-4 CX4121A MCX4121A-ACAT Lx 25GbE PCIe Ethernet Adapter
item 55 Genuine Mellanox ConnectX-4 CX4121A MCX4121A-ACAT Lx 25GbE PCIe Ethernet Adapter
C $137.40
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25Gigabit NIC CX4121A Mellanox ConnectX-4 SFP-25G-SR SFP28 PCIe Ethernet Adapter
item 56 25Gigabit NIC CX4121A Mellanox ConnectX-4 SFP-25G-SR SFP28 PCIe Ethernet Adapter
C $139.53
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MCX4121A-ACAT CX4121A Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
item 57 MCX4121A-ACAT CX4121A Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter
C $146.86
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Genuine Mellanox ConnectX-4 CX4121A MCX4121A-ACAT Lx 25GbE PCIe Ethernet Adapter
item 58 Genuine Mellanox ConnectX-4 CX4121A MCX4121A-ACAT Lx 25GbE PCIe Ethernet Adapter
C $150.67
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Mellanox | MCX4121A-ACAT | Connect-4 Lx 25GbE with 1U 1Slot PCI-E RISER
item 59 Mellanox | MCX4121A-ACAT | Connect-4 Lx 25GbE with 1U 1Slot PCI-E RISER
C $94.81
+C $56.26 shipping
listings for this product

Ratings and Reviews

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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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