CX4121A MCX4121A-ACAT Mellanox ConnectX-4 Lx 25GbE SFP28 PCIe Ethernet Adapter

Winners Hardware
(1762)
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US $57.95
ApproximatelyC $79.88
or Best Offer
Was US $61.00 (5% off)What does this price mean?
Recent sales price provided by the seller
Condition:
Used
“100% Fully tested before shipment, good working condition. Looks like new.”
More than 10 available26 sold
This one's trending. 26 have already sold.
Breathe easy. Returns accepted.
Shipping:
US $5.00 (approx C $6.89) eBay SpeedPAK Standard.
Located in: Shenzhen, China
This item includes applicable import fees—you won’t pay anything extra after checkout.
Delivery:
Estimated between Wed, Oct 1 and Wed, Oct 15 to 94104
Delivery time is estimated using our proprietary method which is based on the buyer's proximity to the item location, the shipping service selected, the seller's shipping history, and other factors. Delivery times may vary, especially during peak periods.
Returns:
30 days return. Buyer pays for return shipping. If you use an eBay shipping label, it will be deducted from your refund amount.
Payments:
     Diners Club

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eBay item number:116424639540
Last updated on Sep 22, 2025 05:35:45 EDTView all revisionsView all revisions

Item specifics

Condition
Used
An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. See all condition definitionsopens in a new window or tab
Seller Notes
“100% Fully tested before shipment, good working condition. Looks like new.”
Compatible Brand
For Mellanox
External Interfaces
Ethernet/ Network Cards
Custom Bundle
No
MPN
MCX4121A-ACAT
Maximum Data Rate
25Gbps
Brand
Mellanox
Form Factor
CompactFlash
Type
Network Interface Controller
Number of Ports
2 Ports
Manufacturer Warranty
6 Months
Model
CX4121A
Country/Region of Manufacture
China
Compatible Port
PCI Express x8
Internal Interfaces
SFP
Category

Item description from the seller

About this seller

Winners Hardware

99.3% positive feedback•38K items sold

Joined Nov 2007
Usually responds within 24 hours
Winners was founded in 2006. It is your excellant source for server, storage, networking and communication products, such as sfp,sfp+,sfp28,qsfp,qsfp28, network card, HBA,expansion card, raid ...
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Detailed seller ratings

Average for the last 12 months
Accurate description
5.0
Reasonable shipping cost
5.0
Shipping speed
5.0
Communication
5.0

Popular categories from this store

See allcategories
QSFP/SFPAOC Cable w/ TransceiversNetwork CardRaid CardsMPOQSFP+ to SFP+ AdapterLC CableOther

Seller feedback (1,920)

All ratings
Positive
Neutral
Negative
  • *****- Feedback left by buyer.
    Past month
    Verified purchase
    Smooth transaction! Seller was responsive and helpful, shipping was quick, and the SFP+ modules were well packed. Items arrived in great condition and works without any issues.
  • *****- Feedback left by buyer.
    Past 6 months
    Verified purchase
    The card arrived in perfect condition, in its box just as it can be seen on the picture. The shipping was quicker than expected, great seller, definitely recommended from my side.
  • *****- Feedback left by buyer.
    Past year
    Verified purchase
    Arrived quickly and as described, packed well. Recognized correctly in PC and was able to link at the correct rate with my switch. Great seller.
    Reply from: nhlfy411- Feedback replied to by seller nhlfy411.- Feedback replied to by seller nhlfy411.
    Thank you so much for taking the time to share your positive experience with our product! Your feedback truly brightens our day and reinforces our commitment to delivering exceptional quality and service. We’re thrilled to hear that the product met your expectations, and it’s customers like you who make our efforts worthwhile. Please don’t hesitate to reach out if you need anything—we’re here to help!
See all feedback

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

See all 7 reviews
  • by hi-networks
    Nov 11, 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: NewSold by: nhlfy411

  • 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-OwnedSold by: hkebl-002

  • 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-OwnedSold by: central_valley_computer_parts_inc

  • by olehenrikj
    Aug 01, 2025

    Worked without issues in my Unraid serve...

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

    Verified purchase: YesCondition: NewSold by: nhlfy411

  • by awake666
    Oct 21, 2024

    very good

    It's a very good product

    Verified purchase: YesCondition: Pre-OwnedSold by: nhlfy411

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