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A used Intel X520-DA2 shows why a server-pull card can make 10GbE hardware look remarkably cheap: one seller listed it for $15.99. But that listing was out of stock when checked, and the card is discontinued. Treat $15 as a past listing example, not a price you can count on—or proof that it is the cheapest option available. The real cost includes a compatible cable or optics, a second 10GbE endpoint, and possibly a switch.
What the $15 card actually is
The Intel X520-DA2 is a discontinued, dual-port network adapter for 10GbE and 1GbE connections. It has two SFP+ ports and connects to a host over PCIe 2.0 x8. Intel specifies a 5.0 GT/s PCIe link. Those details make it a plausible home-network card, but only if your computer and the rest of your network can accommodate it.
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A used-hardware seller displayed a price of $15.99 for an X520-DA2 and described the card as a low-profile, two-port PCIe 2.0 x8 adapter. The listing was out of stock when checked; its year was not stated. This is one seller’s example, not a current offer or a market-wide price benchmark. Since the card is discontinued, check current availability and the exact part number and included bracket before buying.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Intel’s product brief describes support for 10GBASE-SR and 10GBASE-LR optics as well as SFP+ copper direct-attach cables. Intel also states a maximum of 20 Gbps bidirectional throughput per port for the dual-port card. That is a manufacturer capability statement, not a guarantee of application throughput in a particular PC or network.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Work out the complete link cost
A network card does not create a 10GbE connection by itself. You need compatible media and a matching port at the other end. A direct connection between two computers can avoid a switch if both have compatible SFP+ ports and cabling; a network with several wired devices will generally need a switch with suitable ports.
- Card: Include the used card’s purchase price, shipping and any applicable tax.
- Link media: Budget for a compatible SFP+ DAC cable, or compatible optics and fiber for an optical link.
- Other endpoint: The device at the other end also needs a matching 10GbE port and compatible link media.
- Switch, if needed: Check that it has the right type and number of ports for the devices you want to connect.
- Installation fit: Confirm that the card’s slot, bracket and physical clearance work in the host.
Because the $15.99 listing was out of stock, it cannot establish what a working card will cost today. Compare the total installed cost of a complete link, not an old card listing against the price of a complete alternative.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Check that the card fits your computer
PCIe slot and chassis
The X520-DA2 needs a PCIe 2.0 x8 connection. A physical x16 slot may accept an x8 card, but the motherboard or system manual is the authority on electrical lane availability and supported configurations. Check the available slot, chassis clearance, and whether the card needs a full-height or low-profile bracket. Used server pulls and listings can vary, so confirm which bracket is included and whether it matches your case.
SFP+ is not RJ45
The X520-DA2 uses SFP+ ports, not built-in 10GBASE-T RJ45 ports. You cannot plug an ordinary Ethernet patch cable directly into it; the connection needs a compatible DAC cable or optical modules and fiber. Check the exact card variant and the compatibility of the media at both ends before ordering.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Choose compatible SFP+ cabling or optics
For a short run: check the DAC cable
Intel’s X520 compatibility guidance says passive and active limiting DAC cables must comply with SFF-8431 v4.1 and SFF-8472 v10.4, with an SFF-8472 identifier of 03h. Intel gives passive cables a maximum length of 7 meters. Active cables require Intel Network Connections software version 22.01 or later. Verify the cable’s specifications and compatibility with the exact adapter rather than relying on an SFP+ connector alone.
For an optical link: verify the module
The X520 family supports SR and LR optical media, but that does not mean every SFP+ optic will work. Intel’s support article, last reviewed February 11, 2025, states: “Other brands of SFP+ optical modules will not work with the Intel® Ethernet Server Adapter X520 Series.” Consult Intel’s validated compatibility list for the card and module combination before buying. Do not assume an unvalidated generic optic is compatible.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Compare SFP+ with a 10GBASE-T card
The right choice depends more on your existing cabling and endpoints than on a card’s sticker price. Intel’s X540-T2 is a dual-port RJ45 alternative; the vendor selection guide hosted by Insight specifies Cat 6 up to 55 meters for 10GbE and Cat 6A or better up to 100 meters. The figures below describe the relevant trade-offs; they do not establish current prices or comparative power consumption.
| Decision | X520-DA2 (SFP+) | 10GBASE-T RJ45 card |
|---|---|---|
| Connection type | SFP+; requires compatible DAC cable or optics and fiber. | RJ45; can use twisted-pair cabling that meets the category and distance requirements. |
| Host fit | PCIe 2.0 x8; confirm slot, lanes, bracket and clearance. | Check the specific card’s slot, bracket and clearance requirements. |
| Other endpoint | Needs a matching SFP+ port and compatible media. | Needs a matching 10GBASE-T port and suitable cabling. |
| Compatibility check | Verify the exact X520, cable or optic, and endpoint combination; Intel publishes X520 media guidance. | Verify cable category and distance for the intended 10GbE link. |
| Current used price comparison | Not established; the cited $15.99 seller listing was out of stock. | Not stated by the cited selection guide. |
If your machines and switch already have suitable SFP+ ports, an X520-DA2 may fit naturally into that setup. If you need RJ45 to reuse existing twisted-pair wiring, compare a 10GBASE-T card instead. In either case, confirm that every link component supports the same connection type and speed.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Check operating-system and driver support
Intel’s Linux ixgbe driver overview includes the X520 family and discusses 82599-based adapters and optics restrictions. That is documented Linux support, not a guarantee that every OEM variant, operating-system version, driver and transceiver combination will work without configuration. Check the exact card identification and the guidance for your Linux distribution and media. A server-pull card’s OEM identity matters; do not assume every board sold as an X520-DA2 has identical firmware or included parts.
When a server-pull card makes sense
- You can confirm that the host has a suitable PCIe slot and the card fits the chassis.
- You already have, or have budgeted for, compatible SFP+ media and a matching 10GbE port at the other end.
- You have checked Intel’s compatibility requirements for the card, cable or optic you plan to use.
- The complete link cost—not just the card price—works for your setup.
If any of those conditions is uncertain, resolve it before buying. A low card price can be outweighed by missing media, an incompatible endpoint, or a card that does not fit the host.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
