How to specify a used ConnectX adapter correctly
- The suffix is the model. MCX516A-CCAT and MCX516A-CDAT are the same silicon on different PCIe generations; the suffix decides bandwidth and slot fit.
- Port type and count. SFP28, QSFP28 and QSFP56 are different cages; confirm the optic family you already standardise on.
- Height and bracket. Low-profile and full-height brackets are model specific; state your chassis type when requesting a quote.
- Firmware and boot support. Confirm the installed firmware version and whether PXE, UEFI boot or RoCE features you depend on are enabled.
- Airflow and cooling. High-speed adapters run hot in 1U chassis; confirm the airflow direction your server expects.
Used Mellanox ConnectX adapters listed on zhongxindata.hk
The models listed on zhongxindata.hk are in stock; availability is confirmed per part number in your quote.
| Model | Key spec | Listing |
|---|---|---|
| Mellanox ConnectX-5 MCX516A-CCAT | 100GbE dual-port QSFP28, PCIe 3.0 x16 | Mellanox ConnectX-5 MCX516A-CCAT |
| Mellanox ConnectX-5 MCX512A-ACUT | 25GbE dual-port SFP28 | Mellanox ConnectX-5 MCX512A-ACUT |
| Mellanox ConnectX-6 MCX653105A-ECAT | 100GbE single-port QSFP56, PCIe 4.0 | Mellanox ConnectX-6 MCX653105A-ECAT |
| Mellanox ConnectX-6 MCX653106A-ECAT | 100GbE dual-port QSFP56, PCIe 4.0 | Mellanox ConnectX-6 MCX653106A-ECAT |
| Mellanox ConnectX-6 MCX653105A-HDAT | 200GbE single-port QSFP56 | Mellanox ConnectX-6 MCX653105A-HDAT |
| Mellanox ConnectX-4 MCX4131A-GCAT | 40GbE single-port QSFP | Mellanox ConnectX-4 MCX4131A-GCAT |
What to check before you buy a used adapter
- Slot budget. Dual-port 100G adapters typically need x16 slots; confirm your riser configuration before committing to a model.
- Cable and optic compatibility. QSFP28 and QSFP56 cages accept different optic families; send your cable list and we confirm the match.
- Protocol support. The same adapter can be used for Ethernet or InfiniBand depending on model and firmware; confirm which mode your design requires.
- Server compatibility. Bracket height, airflow direction and firmware version decide whether the card reports correctly in your platform.
- Volume consistency. For cluster builds, confirm the batch ships with matching firmware so nodes behave identically.
How ordering works
- Send the adapter model, quantity and your server or switch model on WhatsApp +86 13068616914.
- You receive a quote per part number, stating port type, bracket and PCIe generation.
- We confirm optic, cable and firmware compatibility against your plan before the order is finalised.
- Adapters are dispatched from Hong Kong, China with export documents included.
Frequently asked questions
How do I get a price for an adapter?
All pricing is quoted per part number and quantity; there are no fixed prices on zhongxindata.hk. Send the model, port configuration and quantity on WhatsApp +86 13068616914 for a quote.
What warranty comes with the adapters?
90-day warranty from delivery, covering the adapter as configured in your quote.
Which suffix do I need: CCAT, CDAT, ECAT or HDAT?
The suffix defines port count, port cage and PCIe generation. Tell us your server, slot type and optic family, and we map that to the correct suffix rather than guessing from the product name.
Will the adapter work in my server?
Send the server model and riser configuration. Bracket height, PCIe generation, lane width and airflow direction decide compatibility, and we confirm all four against the specific unit.
Can I buy adapters in quantity for a cluster?
Yes. Pricing is quoted per quantity, each adapter is tested individually, and multi-unit orders are matched on firmware so cluster nodes behave identically.
What condition are the adapters in?
Every adapter is sold as used, with condition stated per unit. Units pass through our in-house re-flash and testing before listing, and photos show the actual hardware.
Related catalog
Get a wholesale quote
Message our B2B team on WhatsApp +86 13068616914 with the part numbers and quantities you need. Quotes are issued per part number and are valid the day they are issued.