Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsTo connect a 10GbE NAS to a Mac or PC, make sure the NAS, computer or adapter, switch (if used), and cabling all support the intended link speed. Then connect over Ethernet, access the NAS through its supported file-sharing protocol—usually SMB—and verify the negotiated speed before judging file-copy performance. If transfers are slow, test a wired path, bypass the switch, and check network, client, and storage limits in that order.
Choose how the NAS and computer will connect
For a shared home or office network, connect the NAS and computer to 10GbE-capable ports on a switch. A direct Ethernet connection is also useful for a two-device setup or for troubleshooting because it removes the switch from the path. Whichever arrangement you use, the speed is limited by the slowest part of the connection: NAS interface, computer port or adapter, switch ports, and cabling.
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Use a switch for a shared network
Check that the ports used by both the NAS and computer support 10GbE; a switch with some 10GbE ports does not make its other ports 10GbE. Also check any intermediate equipment and the cable runs. If the computer is connected over Wi-Fi, its transfers do not use the intended wired 10GbE path.
Connect directly to isolate the switch
Connect the NAS and computer by Ethernet, then compare transfer behavior with the normal network path. If the direct test is faster, investigate the switch, its port configuration, and other equipment between the devices. Direct connections can require product-specific IP configuration or NAS-discovery steps; there is no single procedure that applies to every NAS and operating system.
#1 Best Overall
- 10 Gbps PCIe Network Card: With the latest 10GBase-T Technology, TX401 delivers extreme speeds of up to 10 Gbps, which is 10× faster than typical Gigabit adapters, guaranteeing smooth data transmissions for both internet access and local data transmissions[1]
- Versatile Compatibility: With extreme speed and ultra-low latency, 10GBase-T is backwards compatible with multiple data rates (10 Gbps, 5 Gbps, 2.5 Gbps, 1 Gbps, 100 Mbps), automatically negotiating between higher and lower speed connections
- QoS: Quality of Service technology delivers prioritized performance for gamers and ensures to avoid network congestion for PC gaming
- Free CAT6A Ethernet Cable: To maximize TX401's performance, a 1.5 m CAT6A Ethernet Cable is included—rated for up to 10 Gbps while a regular cable is only rated for 1 Gbps
- Low-Profile and Full-Height Brackets: In addition to the standard bracket, a low-profile bracket is provided for mini tower computer cases
Check the computer port, adapter, and cable
A 10GbE NAS cannot deliver a 10GbE link to a computer that lacks a compatible port. Use an appropriate 10GbE NIC or adapter and confirm its host connector, operating-system support, and driver requirements with the manufacturer.
Adapter compatibility is model-specific
For example, QNAP’s QNA-UC10G2T product page describes a dual-port 10GbE RJ-45 adapter for compatible USB4 or Thunderbolt 3/4 hosts. As listed on the page accessed October 4, 2026, macOS 12.7 through 15.4 is supported, while Windows 11 requires a Marvell AQtion AQC113 driver. Verify the live product documentation before buying or installing: listed OS support can change, and connector compatibility alone does not guarantee that a particular computer will work.
Rank #2
- 10GbE Performance & USB-C Requirements: Upgrade to fast wired networking with this USB C to 10Gb Ethernet adapter, supporting 10G/5G/2.5G/1G/100M auto-negotiation for broad compatibility. Great for NAS access, large backups, content workflows, and low-latency gaming. Note: 10GbE is the theoretical link rate; real-world Windows throughput is typically ~7Gbps depending on setup. For best results, use a USB 3.2 Gen 2x2 (20Gbps) USB-C port or higher.
- Real-World macOS Speed: Compatible with Thunderbolt 3/4/5 and USB4 ports. On Macs, macOS may report a 5Gb link rate, while typical real-world throughput is ~5Gbps depending on the Mac model, network equipment, cabling, and test method. We continuously validate macOS performance and publish the latest notes and updates on our support page.
- Stable Performance with Advanced Chipset: Powered by the Realtek RTL8159 USB 10G controller for efficient power use and minimal heat in typical operation. Designed to address the heat concerns common with some 10GbE adapters, this 10Gb Ethernet to USB C adapter delivers cool and reliable performance in a compact design.
- Premium & Durable Design: Built to last with a rugged aluminum housing plus integrated thermal silicone and a heat sink to help dissipate heat and withstand daily wear, scuffs, and impacts. The braided USB-C pigtail cable adds strength and flexibility to help prevent fraying and reduce port strain—ideal for travel kits, mobile workstations, and tight dock setups.
- Easy Setup & Wide Compatibility: Plug-and-play on the latest macOS and Windows. Some older OS releases may limit performance; if speed is reduced on Windows or certain Linux kernels, install the latest Realtek RTL8159 USB 10G driver (macOS typically needs no manual driver—keep macOS updated). Works with USB-C, USB4, and Thunderbolt 5/4/3 devices including MacBook, iMac, Dell XPS, Surface, iPad Pro, and more. Not for Android / Xbox One S.
Match cable category to the run
Apple’s guidance for Macs with 10GbE RJ-45 lists Cat 6 for 10GbE runs up to 55 m, and Cat 6a or later for runs up to 100 m. Those are cable-distance specifications in Apple’s guidance, not a guarantee for every installed cable run. QNAP lists Cat 5e, Cat 6, and Cat 6a-or-above options for its adapter, but that should not be read as a blanket promise that every Cat 5e installation will deliver 10GbE. Choose cable based on the complete path, distance, and equipment specifications. Apple’s Mac Ethernet port guidance provides the distance entries.
Open the NAS shares over SMB
Use a file-sharing protocol supported by both the NAS and computer; SMB is the usual cross-platform choice. Enable the appropriate service and share permissions in the NAS settings, then connect from the Mac or Windows file manager using the NAS’s name or network address and the credentials authorized for that share. The exact interface and discovery steps vary by NAS brand and operating-system version, so follow the device maker’s instructions rather than assuming one universal menu path.
Rank #3
- USB4 TO 10G ETHERNET ADAPTER: Adds multi-Gigabit RJ45 port to a USB-C (USB4 Gen 4x4 TB5 TB4 TB3 compatible) computer, enabling connection to 100Mbps, 1G, 2.5G, 5G, 10G networks; Ideal for delivering fast, stable wired connectivity on USB-C devices
- FULL 10GBPS PERFORMANCE: Transfer large files or work directly from the cloud with a reliable 10GbE connection, ideal for 4K/8K editing, large data transfers, and high-speed cloud access; Easy setup on Windows 10/11 and auto-install on macOS 14.2+
- SMART DESIGN FOR QUICK INTEGRATION: Detachable 19.6in (50cm) USB4 cable and advanced features like Wake-on-LAN, Autonegotiation, and NBASE-T deliver a clean, flexible setup; Status LEDs provide clear connection feedback for easy deployment and monitoring
- PORTABLE AND DURABLE: Compact, bus-powered adapter features an all-aluminum housing for optimized heat dissipation and silent passive cooling; Ideal for travel, remote work, or dynamic IT environments where reliability and portability matter
- THE IT PRO'S CHOICE: Designed for reliability in edge and on-prem deployments; TAA compliant and lab-tested and field-proven for seamless integration and maximum uptime; Backed by free lifetime 24/5 multi-lingual technical assistance
Apple documents SMB Multichannel as a way for macOS to establish more than one connection to an SMB server. It can increase transfer speed and provide redundancy, but only when the server, client, and network configuration support it; it does not guarantee a faster copy in every setup. See Apple’s SMB Multichannel documentation.
Verify the link before measuring file transfers
Check the network status on both the NAS and the computer. Synology identifies 1000 Mbps as the status for a 1GbE port and 10000 Mbps for a 10GbE port. If either endpoint reports 1000 Mbps, the path has not negotiated 10GbE, regardless of the NAS’s product label. Apple notes that a Mac’s built-in RJ-45 10GbE port negotiates the highest speed supported by the connected device, cable type, and cable length. See Synology’s slow-transfer troubleshooting guide and Apple’s port guidance.
Rank #4
- TEN GIGABIT ON WINDOWS 11: Owners report iPerf runs near line rate over Cat6a once the Realtek 10G driver is on; on macOS this class of adapter settles well short of that, so buy it for a Windows machine
- YOUR PORT DECIDES THE SPEED: Full 10G needs a USB 3.2 Gen 2x2 20Gbps port, or Thunderbolt 3, 4 or USB4; a plain USB 3.0 or 3.1 port still links but tops out lower, so check your laptop before ordering
- INSTALL THE REALTEK 10G DRIVER FIRST: The generic driver Windows ships holds the link well below 10G; the card in the box points to the right Realtek package, and full speed appears after one reboot
- SIX LINK SPEEDS, ONE CABLE RULE: Negotiates 10G, 5G, 2.5G, 1G, 100M and 10M so it drops into any switch; 10G wants Cat6a out to 100m, while Cat5e and Cat6 carry 5G and 2.5G the same way
- ALUMINUM SHELL IS THE HEATSINK: Ribbed alloy body spreads heat with no fan and no noise, so it runs warm under sustained transfers by design; in the box are the adapter with attached USB-C cable and a driver card
For a sustained check, Synology recommends using a test file of at least 5 GB and comparing another computer when possible. A large-file transfer can reveal sustained performance better than a tiny copy, but it does not represent every workload: many small files can behave differently from one large sequential file. Treat link speed and file-copy speed as separate measurements. QNAP gives approximately 9.4 Gbit/s as a reference transfer rate for 10GbE in its troubleshooting article; that is not a promised SMB copy result for every NAS, client, or workload.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallTroubleshoot slow transfers in order
- Confirm the negotiated link speed. Check the NAS and computer network status. If either end shows 1GbE instead of 10GbE, inspect the port, adapter, switch, and cable path before changing file-sharing settings.
- Make the test repeatable and wired. Disable Wi-Fi during the test so traffic uses the intended Ethernet route. Copy a large file—Synology recommends at least 5 GB—and, if possible, repeat from another computer. Record whether the slowdown affects all clients or just one.
- Test without the switch. Where supported, connect the NAS directly to the computer and compare. Better performance on the direct path points toward the switch or another intermediate network component as a place to investigate.
- Check cable condition and distance. Look for damage or sharp bends, try a known-good cable, and confirm that the cable type and run length suit the target speed. Recheck the negotiated link after replacing it.
- Keep MTU settings consistent. Synology gives 1500 as the default MTU and advises that devices accessing the NAS use the same MTU if it is changed. QNAP’s jumbo-frame example uses 9000 on the adapter, NAS, and switch port. Do not change only one device; if a jumbo-frame setting causes trouble or offers no benefit, return the path to a mutually supported setting. See Synology’s MTU guidance and QNAP’s jumbo-frame setup example.
- Separate network limits from SMB and disk limits. An SMB copy result by itself does not identify the bottleneck. QNAP recommends isolating network performance first. Synology names CrystalDiskMark for Windows and Blackmagic Disk Speed Test for Mac as tools for testing local drive or folder behavior via SMB. Compare the result with local disk performance and available network-layer tests, where supported, rather than treating one file copy as a definitive diagnosis.
- Inspect load and storage configuration. Check client CPU and disk activity, NIC drivers, and software that may affect transfers. On the NAS, check volume health, drive type and count, and RAID configuration. A fast network link cannot remove limits imposed by a busy computer or slower storage.
Why 10GbE does not guarantee 10GbE file copies
The link rate describes the network connection, not the complete file-sharing workload. SMB processing, client and NAS CPU load, storage speed, drive count, RAID configuration, and the type of files being copied all matter. A large sequential file and a folder containing many small files can produce different results even on the same connection. Diagnose the path in layers—link, network equipment, protocol and client, then storage—so that a slower copy does not lead to an unnecessary network or NAS upgrade.
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