# Mellanox ConnectX-3 MCX354A (40/56GbE) price tracker As of Nov 5, 2026, Mellanox ConnectX-3 MCX354A (40/56GbE) on eBay: used listings start at $19.99 (median $46.45); new from $32.99; refurb from $23.99. Is $19.99 a good Black Friday price for the Mellanox ConnectX-3 MCX354A (40/56GbE)? Across the 12 days we checked since Oct 24, its lowest eBay listing was $19.99 and the median listing was $48.66. Today's low is at that low. [Black Friday check →](https://sharpest.ai/black-friday) [See the cheapest Mellanox ConnectX-3 MCX354A (40/56GbE) on eBay (used) — $19.99 →](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C800819622608%7C0) [New from **$32.99**](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C256390480825%7C0)[Refurbished from **$23.99**](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C267809193379%7C0)[Used from **$19.99**](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C800819622608%7C0) Far below the other listings: check the seller, photos and condition before buying. [Compare new on Amazon →](https://www.amazon.com/s?k=mellanox+mcx354a+connectx-3&tag=sharpestai-20) As an eBay Partner and Amazon Associate we earn from qualifying purchases, at no cost to you. Lowest now**$19.99** Typical (median)**$47.25** 7 days** ▼ 5.0%** 30 days** —** Live listings**72Buy or wait?** Fair price: today's low is within 1% of its 18-day average. ## Cheapest Mellanox ConnectX-3 MCX354A (40/56GbE) listings right now | | Listing | Condition | Price + ship | | |---|---|---|---|---| | | Mellanox CX354A ConnectX-3 VPI QDR IB 10GbE 2 Port QSFP Adapter NIC MCX354A-QCBT Buy It Now offers | Used | $19.99 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C800819622608%7C0) | | | Mellanox ConnectX-3 CX354A MCX354A-TCBT 2-Port 10Gb InfiniBand PCI-E Server HBA Buy It Now offers | Open box | $20.99 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C204487374066%7C0) | | | Mellanox ConnectX-3 QDR InfiniBand 10GbE MCX354A-QCBT CX354A Low Profile Card Buy It Now offers | Used | $21.06 | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C406875935816%7C0) | | | MELLANOX CONNECTX-3 MCX354A-QCBT CX354A QDR INFINIBAND DUAL PORT ADAPTER W/CABLE Buy It Now offers | Used | $21.69 sale: was $11.99, −17% | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C385663918763%7C0) | | | Mellanox MCX354A-QCBT ConnectX-3 QDR InfiniBand 10GB Dual-Port FH w/SAS Expander Buy It Now offers | Used | $21.95 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C266339584982%7C0) | | | Mellanox ConnectX-3 VPI 40 / 56GbE Dual-Port QSFP Adapter MCX354A-FCBT CX354A LH Buy It Now offers | Used | $22.64 | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C820263256080%7C0) | | | Mellanox MCX354A-FCBT ConnectX-3 FDR Infiniband + 40GigE Adapter - High Profile Buy It Now offers | Used | $23.38 | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C389731159612%7C0) | | | Mellanox MCX354A-FCBT ConnectX-3 FDR Infiniband + 40GigE Adapter - Low Profile Buy It Now offers | Used | $23.38 sale: was $18.71, −20% | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C389731159618%7C0) | | | Mellanox ConnectX-3 MCX354A Dual Port QSFP+ PCIe Network Adapter MCX354A-TCBT Buy It Now offers | Excellent - Refurbished | $23.99 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C267809193379%7C0) | | | Mellanox MCX354A-FCBT ConnectX-3 FDR InfiniBand 40GbE Dual QSFP PCIe x8 Card Buy It Now offers | Used | $24.99 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C117496844840%7C0) | | | Mellanox ConnectX-3 Dual-Ports 10GB/s 10Gigabit Ethernet PCI-E MCX354A-TCBT Buy It Now offers | Used | $24.99 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C187213975581%7C0) | | | Mellanox MCX354A-QCBT CX354A ConnectX-3 VPI QDR IB 10GbE Dual-Port QSFP PCIe Buy It Now | Used | $26.06 | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C406794595342%7C0) | | | Mellanox ConnectX-3 VPI 40 / 56GbE Dual-Port QSFP Adapter MCX354A-FCBT CX354A Buy It Now offers | Used | $26.72 sale: was $15.59, −21% | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C404708130746%7C0) | | | MCX354A-QCBT Mellanox ConnectX-3 2-Port 10Gbps PCI-e QSFP Network Adapter Buy It Now offers | Used | $26.99 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C306136892938%7C0) | | | Mellanox Technologies ConnectX-3 MCX354A-FCBT 2-Port 10/40GB NIC Network Card Buy It Now offers | Used | $29.38 | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C126636973941%7C0) | | | HP Mellanox 544QSFP 649281-B21 MCX354A-FCBT Firmware 40GbE PCIe ConnectX-3 NIC Buy It Now | Used | $29.95 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C225185478335%7C524109200185) | | | Mellanox MCX354A-FCCT Crossflashed from MCX314A-BCCT ConnectX-3 Pro Infiniband Buy It Now | Used | $29.95 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C225186681944%7C524393102051) | | | Mellanox MCX354A-FCBT 40Gb Ethernet 56Gb FDR Infiniband ConnectX-3 Pro QSFP PCIe Buy It Now | Used | $29.95 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C327306545073%7C516069695118) | | | Mellanox MCX354A-QCBT CX354A ConnectX-3 QDR IB 10GbE Dual-Port QSFP PCIe Buy It Now | New | $32.99 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C256390480825%7C0) | | | Mellanox ConnectX-3 VPI MCX354A-FCBT 40GbE/56Gb Dual QSFP Adapter Buy It Now | New | $33.61 | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C157840489441%7C0) | | | Mellanox ConnectX-3 QDR InfiniBand 10GbE MCX354A-QCBT CX354A High Profile Card Buy It Now offers | Used | $33.81 sale: was $49.00, −31% free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C156132292845%7C0) | | | Mellanox ConnectX-3 QDR InfiniBand 10GbE MCX354A-QCBT CX354A Low Profile Card Buy It Now offers | Used | $33.81 sale: was $49.00, −31% free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C166662363627%7C0) | | | Mellanox MCX354A-QCBT SAS Dual Port 10GbE PCI-e ConnectX-3 NIC Network Card C5 Buy It Now offers | Used | $34.38 | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C404165612864%7C0) | | | Mellanox ConnectX-3 QDR InfiniBand 10GbE MCX354A-QCBT Tall Profile Card TESTED! Buy It Now | Used | $35.00 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C197160297732%7C0) | | | Mellanox ConnectX-3 QDR InfiniBand 10GbE MCX354A-QCBT Low Profile Card TESTED! Buy It Now | Used | $35.00 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C205386553515%7C0) | | | MCX354A-FCBT Mellanox ConnectX-3 PCI-e 3.0 x8 10GBase-X QSFP Dual-Port Adapter Buy It Now offers | Used | $38.00 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C236319378661%7C0) | | | Mellanox MCX354A-FCBT CONNECTX-3 40/56GB DP LP Buy It Now offers | Used | $39.95 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C960123669317%7C0) | | | Mellanox CX354A 2 Port ConnectX-3 FDR InfiniBand 40GbE QSFP Adapter MCX354A-FCBT Buy It Now | Used | $39.99 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C374758633410%7C0) | | | ** MCX354A-FCBT Mellanox ConnectX-3 2-Ports 40Gbps PCI-E QSFP+ Network Adapter** Buy It Now offers | Used | $41.00 free ship | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C327307387952%7C0) | | | Mellanox MCX354A-FCBT ConnectX-3 CX354A 2-Port 40GbE Buy It Now offers | Used | $41.00 | [View on eBay](https://sharpest.ai/go/homelab/mellanox-connectx-3-mcx354a/v1%7C398133933868%7C0) | ## Get a price-drop alert We'll email you when a Mellanox ConnectX-3 MCX354A (40/56GbE) listing hits your price. One email per drop, unsubscribe in one click. By continuing you agree to our [Terms](https://sharpest.ai/terms) and [Privacy Policy](https://sharpest.ai/privacy). ## Where today's prices sit 72 live listings by price (item + shipping). The highlighted bar is the cheapest band. ## Price history typical asking price lowest asking price ## Market read Of 72 Buy It Now listings, 64 used (from $19.99), 7 new (from $32.99), 1 refurb (from $23.99). The cheapest used copy is 39% below the cheapest new one. 65% ship free; the rest add $14.39 shipping at the median. The middle half of asking prices runs $32.99 to $113, so anything under $32.99 is in the cheapest quarter. Lowest we have recorded since 2026-10-19: $19.99 on 2026-10-19 — today matches it. Asking prices of US eBay listings including shipping, as of 2026-11-05 (checked twice a day); we earn a commission on purchases through these links; parts, broken units and accessories are filtered out. [How we price](https://sharpest.ai/about#method). ## Head to head - [Mellanox ConnectX-3 MCX354A (40/56GbE) vs Chelsio T520-CR (10GbE)](https://sharpest.ai/homelab/vs/chelsio-t520-cr-vs-mellanox-connectx-3-mcx354a) - [Mellanox ConnectX-3 MCX354A (40/56GbE) vs Mellanox ConnectX-4 MCX4131A (50GbE)](https://sharpest.ai/homelab/vs/mellanox-connectx-3-mcx354a-vs-mellanox-connectx-4-mcx4131a) ## Compare - [Mellanox ConnectX-3 MCX311A (10GbE)](https://sharpest.ai/homelab/mellanox-connectx-3-mcx311a) $22.99 - [Mellanox ConnectX-4 MCX4131A (50GbE)](https://sharpest.ai/homelab/mellanox-connectx-4-mcx4131a) $29.49 - [Mellanox ConnectX-5 MCX516A (100GbE)](https://sharpest.ai/homelab/mellanox-connectx-5-mcx516a) $199 - [Mellanox ConnectX-6 Dx MCX623106 (100GbE)](https://sharpest.ai/homelab/mellanox-connectx-6-mcx623106) $757 - [Intel X540-T2 (10GBase-T)](https://sharpest.ai/homelab/intel-x540-t2) $18.99 - [Intel X550-T2 (10GBase-T)](https://sharpest.ai/homelab/intel-x550-t2) $72.98 - [Intel XXV710-DA2 (25GbE)](https://sharpest.ai/homelab/intel-xxv710-da2) $39.98 - [Intel E810-XXVDA2 (25GbE)](https://sharpest.ai/homelab/intel-e810-xxvda2) $136 - [Chelsio T520-CR (10GbE)](https://sharpest.ai/homelab/chelsio-t520-cr) $24.00 - [Broadcom BCM57414 (25GbE)](https://sharpest.ai/homelab/broadcom-57414) $25.99 --- As of 2026-11-05. Canonical page: https://sharpest.ai/homelab/mellanox-connectx-3-mcx354a