Sell Your Mellanox ConnectX-4 Lx 25GbE Dual SFP28
Updated July 7, 2026
per unit, non-binding indicative range
Non-binding — firm quote in 4 business hours.
What condition pays what
| Condition | Means | Pays |
|---|---|---|
| Working | Verified on our bench | $25–$38 |
| Damaged | Declined politely | declined |
What this item is
The Mellanox ConnectX-4 Lx 25GbE Dual SFP28 is a sought-after server NIC — homelab builders and refurbishers keep steady demand for it. Cards like this have strong value density, so even one or two are worth mailing in with our free label. We verify link and port function on the bench; original brackets and both SFP cages intact help the grade. The 25 and 100 gigabit parts in particular stay liquid. Common part numbers include MCX4121A-ACAT.
Part numbers we buy
- MCX4121A-ACAT
Don't see yours? Paste it into the quote form — we match variants daily.
How it works
- Firm quote by email within 4 business hours (Mon–Sat 8–6 ET).
- Ship free with our prepaid label — postmark within your lock window.
- Paid by Zelle, PayPal, or check within 48 hours of testing.
If testing disagrees with your description, you get photo evidence and a choice: revised offer or free return.
Questions
How much is a Mellanox ConnectX-4 Lx 25GbE Dual SFP28 worth in 2026?
Our current indicative payout is $25-$38 per unit in used working condition, with the firm number emailed within 4 business hours of your quote request. The range moves with the market — the Payout Index shows what we actually paid over the trailing 30 days.
Is a single card worth mailing in?
Usually yes — network adapters have strong value density, so even one or two cards clear our $50 order minimum. The label is free either way, so the math is just the payout.
How fast do I actually get paid?
Zelle or PayPal within 48 hours of test completion; typical mail-to-money is 5-7 days end to end. Your quote locks before you ship, and if the market drops after we quote, we pay the quote anyway.