Mellanox ConnectX-4 Lx 25GbE (MCX4121A-ACAT) price tracker
Lowest now$39.90
Typical (median)$79.90
7 days—
30 days—
Live listings62
Buy or wait? Tracking began 2026-10-16, so there isn't enough history for a buy/wait call yet. Today the cheapest clean listing is 50% under the typical one.
See the cheapest Mellanox ConnectX-4 Lx 25GbE (MCX4121A-ACAT) on eBay — $39.90 →
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Where today's prices sit
62 live listings by price (item + shipping). The highlighted bar is the cheapest band.
Price history starts 2026-10-16 — the chart appears after the second daily snapshot.
Cheapest Mellanox ConnectX-4 Lx 25GbE (MCX4121A-ACAT) listings right now
| Listing | Condition | Price + ship | ||
|---|---|---|---|---|
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HPE 640SFP28 PCIe 3.0 x8 10/25GB SFP28 CX4121A 840140-001 SFP+ MCX4121A-ACUT OEM | Used | $39.90 free ship | View on eBay |
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20NJD Dell Mellanox CX4121C ConnectX-4 Lx 25GBe SFP 2 Port Daughter Card 020NJD offers | Used | $41.00 free ship | View on eBay |
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Mellanox MCX4121A-ACAT ConnectX-4 Lx EN Dual Port 125Gb/s Adapter offers | Used | $45.00 free ship | View on eBay |
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MELLANOX MCX4121A-ACAT 25GBE SFP28 DP CONNECTX-4 LX CX4121A NIC offers | Used | $45.00 free ship | View on eBay |
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Mellanox CX4141A 2-Port 25Gb SFP28 PCIe 3.0x8 Network Adapter MCX4121A-ACAT offers | Used | $45.00 + ship? | View on eBay |
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HPE 640SFP28 PCIe 3.0 x8 10/25GB SFP28 CX4121A 840140-001 SFP+ MCX4121A-ACUT HP | Used | $49.90 free ship | View on eBay |
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Mellanox MCX4121A-ACAT / 2-Port ConnectX-4 Lx 25GbE Network Adapter offers | Used | $49.95 + ship? | View on eBay |
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Mellanox MCX4121A-ACAT / 2-Port ConnectX-4 Lx 25GbE Network Adapter offers | Used | $49.95 + ship? | View on eBay |
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Dell Mellanox ConnectX-4 Lx CX4121C Dual 25GbE SFP28 LP 20NJD 020NJD offers | Used | $49.95 free ship | View on eBay |
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Dell Mellanox CX4121C ConnectX-4 LX 2P 25GbE SFP28 PCIe x8 NIC Card 020NJD 20NJD offers | Excellent - Refurbished | $49.99 free ship | View on eBay |
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MCX4121A-ACAT Mellanox CX4121A ConnectX-4 Lx 25GbE Network Adapter offers | Used | $55.00 free ship | View on eBay |
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Mellanox ConnectX-4 Lx 25GbE Dual SFP28 Low Profile NIC CX4121A - Used | Used | $55.00 + ship? | View on eBay |
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Mellanox MCX4121A-ACAT 25GbE Dual-Port SFP PCIe Plug-in Network Card offers | Used | $55.00 + ship? | View on eBay |
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OEM Mellanox ConnectX-4 LX MCX4121A-ACAT PCIe x8 3.0 25GB SFP28 CX4121A CX4121C offers | Used | $56.99 + ship? | View on eBay |
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MCX4121A-ACAT Mellanox ConnectX-4 Lx EN 25GbE 2-Port SFP+ SFP28 Network Long offers | Used | $57.00 free ship | View on eBay |
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MCX4121A-ACAT Mellanox ConnectX-4 Lx EN 25GbE 2-Port SFP+ SFP28 Network Low offers | Used | $57.00 free ship | View on eBay |
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Mellanox ConnectX-4 Lx MCX4121A-ACAT 25Gbe PCIe SFP28 Dual-Port Network Adapter offers | Used | $58.99 free ship | View on eBay |
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MCX4111A-ACAT MELLANOX CONNECTX-4 LX 25GBE SINGLE-PORT SFP28 PCI-E NETWORK CARD offers | Open box | $59.99 free ship | View on eBay |
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Mellanox MCX4121A-ACAT ConnectX-4 LX EN 2-Port 25GbE SFP28 PCI-e 3.0 x8 NIC SFF | Used | $59.99 free ship | View on eBay |
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IBM 01KU164 with Mellanox MCX4121A-ACAT Firmware ConnectX4-LX PCIe Adapter NIC | Used | $64.55 free ship | View on eBay |
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MCX4121A-ACAT Mellanox ConnectX-4 Lx EN 25GbE 2-Port SFP+ SFP28 Network Card offers | Used | $65.00 free ship | View on eBay |
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Mellanox ConnectX-4 LX EN Dual Port 25 Gigabit SFP PCI-E3x8 Card MCX4121A-ACAT offers | Open box | $69.99 + ship? | View on eBay |
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CX4121A Dual 25Gbs SFP28 Fiber Ports Mellanox ConnectX-4 Lx 25GbE PCIe 3.0x8 NIC | New | $74.02 free ship | View on eBay |
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MELLONOX MCX4121A-ACAT ConnectX-4Lx 25 GbE (36.5-279-13) offers | Used | $75.00 + ship? | View on eBay |
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MELLONOX MCX4121A-ACAT ConnectX-4Lx 25 GbE (36.5-279-13) offers | Open box | $75.00 + ship? | View on eBay |
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MCX4121A-ACAT Mellanox ConnectX-4 Lx 25Gbe PCIe 3.0 SFP28 Dual-Port Network Card offers | Used | $78.00 free ship | View on eBay |
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OEM Mellanox ConnectX-4 LX MCX4121A PCIe x8 25GB SFP28 CX4121A 840140-001 SFP+ | Used | $79.90 free ship | View on eBay |
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OEM Mellanox ConnectX-4 LX MCX4121A PCIe x8 10 / 25GB SFP28 Gbit CX4121C 01GR253 | Used | $79.90 free ship | View on eBay |
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OEM Mellanox ConnectX-4 LX MCX4121A-ACAT PCIe x8 3.0 25GB SFP28 CX4121A CX4121C | Used | $79.90 free ship | View on eBay |
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OEM Mellanox ConnectX-4 LX MCX4121A-ACAT PCIe x8 3.0 25GB SFP28 CX4121A CX4121C | Used | $79.90 free ship | View on eBay |
About these prices
These are asking prices of active fixed-price and best-offer listings from US sellers, item plus shipping (sales tax excluded), checked twice daily. We drop listings whose titles mention parts, damage, untested or non-working condition, lots, bundles, accessories and mismatched models or capacities, plus anything priced far below the pack. Always read the listing before buying.