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The USB link behind the socket sets the ceiling of the Ethernet port · review

BENFEI USB-C to gigabit Ethernet adapter, driverless on three systems review

A gigabit adapter that names four Ethernet standards and then asks for Category 6 cable if the gigabit is to be had, which is the chain stated by the maker rather than by us.

By

On the listing

A compact USB-to-Ethernet adapter joining a computer or tablet to a router, modem or switch, adding a standard RJ45 socket to an ultrabook, notebook or laptop; an integrated advanced chip joining RJ45 Ethernet and USB 3.0, driverless on Chrome OS, macOS and Windows, with Wake-on-LAN, full-duplex and half-duplex working, crossover detection, back-pressure routing and automatic MDI-X, and a note that Category 6 cable or better is needed for the gigabit; full 10/100/1000 Mbit/s gigabit Ethernet over the 5 Gbit/s bus of USB 3.0, with link and activity lights, powered from USB with no external supply and backwards compatible with USB 2.0 and 1.1; compatibility given as Windows 7, 8 and 10, Vista and XP, macOS 10.6 to 10.12, Linux kernel 3.x and 2.6, Android and Chrome OS, with IEEE 802.3, 802.3u and 802.3ab named and 802.3az supported, Windows RT excluded and the Nintendo Switch excluded; and an eighteen-month warranty.

Category 6 as a condition of the gigabit

To have 1 Gbit/s, use Category 6 cable or better. The sentence is in the second bullet, in brackets, after a warning symbol. It is the maker saying out loud what this hub says about every rate on it: the figure belongs to the standard, and the slowest link in the chain decides what actually happens. Here the maker names the link.

Two lists of Windows

The title says Windows 11, 10, 8 and 7. The fourth bullet runs further back — 8.1, Vista and XP — and gives Mac OS X 10.6 to 10.12, Linux kernel 3.x and 2.6, Android and Chrome OS. The older half of the list is the more interesting one, because an adapter that still names XP is built on a chip with drivers for almost everything; the Mac half stops at 10.12, so a current macOS has to be taken on the driver-free claim in the second bullet.

The chip that is not named

Every other question on this page is answered with a number or a standard. The chip is answered with an adjective. On a shelf where the whole purchase turns on whether the laptop already carries the driver, that is the one line that would have been worth naming.

Before ordering

Look at what is in the wall. The adapter states the cable grade it wants, and a run of older cable will negotiate lower without saying so.

Where it holds up, and where it stops

Strengths

  • Names four IEEE standards including 802.3az, so the socket can be checked against a switch port rather than against a figure
  • States the condition on its own headline rate: Category 6 cable or better for the gigabit, which is the maker publishing the weakest link in the chain
  • Says which platforms are excluded, Windows RT and the Nintendo Switch, instead of listing only what works

Compromises

  • The chip is described as advanced and never named, and on this family the chip is what decides whether a laptop needs a driver at all
  • The Mac list stops at Mac OS X 10.12, so no current macOS version is named
  • Nothing about the body or the lead, so how the adapter behaves on a desk cannot be read before it arrives

Specifications

USB generationUSB 3.0 — stated in the title and in the second bullet, with the third adding backwards compatibility with USB 2.0 and 1.1
Stated link rate5 Gbit/s — stated in the third bullet as the USB 3.0 bus over which the gigabit Ethernet is carried. It is one of only two pages on this shelf that put a figure on the host link rather than on the socket
Connector typeUSB Type-C — stated in the title, which names a USB-C to Ethernet adapter and then describes the link behind it as USB 3.0
Ethernet port speed standard10/100/1000 Mbit/s gigabit Ethernet — stated in the third bullet, with the fourth naming IEEE 802.3, IEEE 802.3u and IEEE 802.3ab and adding support for IEEE 802.3az energy-efficient Ethernet. The second bullet attaches a condition: Category 6 cable or better if the gigabit is to be had
Controller familyNot published on the listing — the second bullet credits an integrated advanced chip and never names it, on a page that names four IEEE standards in the bullet below
Stated operating system supportPublished twice. The title names Windows 11/10/8/7 and Mac OS; the fourth bullet names Windows 11, 10, 8.1, 8, 7, Vista and XP, Mac OS X 10.6 to 10.12, Linux kernel 3.x and 2.6, Android and Chrome OS, and excludes Windows RT and the Nintendo Switch
Housing materialNot published on the listing — the first bullet calls the body compact and portable and never says what it is made of
Cable arrangementNot published on the listing as a length — the adapter is described as portable and compact, and no bullet says whether the plug sits on a lead or on the body, nor how long any lead is
Amazon referenceB08KWC7D78
EAN6971785942059
On Amazon.comAmazon.com had an offer at $8 on October 26, 2026.

The questions that come up before an order

Why does a gigabit adapter ask for Category 6 cable?

Because the socket is only one link in the chain, and the cable is another. The maker states the grade it wants for its own figure to hold, which is more honest than printing the figure alone. On a run of older cable the negotiation simply settles lower, and nothing on the adapter says that it has.

What is IEEE 802.3az, and does it change anything day to day?

It is energy-efficient Ethernet: the link drops into a low-power state when there is nothing to send and comes back when there is. It saves a small amount of power on a machine that is on all day. Its real value here is as evidence that the page was written from a specification rather than from a marketing sheet.

Our score

7.2/ 10

A conventional gigabit adapter on a page that behaves unusually well: standards named, exclusions named, and the cable grade its own figure depends on named too. The unnamed chip is the one blank that matters on this shelf.

Against the rest of the network and storage gear

This network and storage gear share the category and the price bracket. Only what each one states is shown; an incomplete column would mislead.

Model Price USB generationStated link rateConnector typeEthernet port speed standard
BENFEI USB-C to gigabit Ethernet adapter, driverless on three systems $8 USB 3.0 — stated in the title and in the second bullet, with the third adding backwards compatibility with USB 2.0 and 1.15 Gbit/s — stated in the third bullet as the USB 3.0 bus over which the gigabit Ethernet is carried. It is one of only two pages on this shelf that put a figure on the host link rather than on the socketUSB Type-C — stated in the title, which names a USB-C to Ethernet adapter and then describes the link behind it as USB 3.010/100/1000 Mbit/s gigabit Ethernet — stated in the third bullet, with the fourth naming IEEE 802.3, IEEE 802.3u and IEEE 802.3ab and adding support for IEEE 802.3az energy-efficient Ethernet. The second bullet attaches a condition: Category 6 cable or better if the gigabit is to be had
UGREEN UG-USBC-25052, 2.5-gigabit Type-C adapter in an aluminum shell $26 Not published on the listing — no generation and no USB number appears in the title or in any of the five bullets. The connector is named as USB-C throughout and the link behind it is never describedNot published on the listing for the host link — the only rate on the page, up to 2500 Mbps, belongs to the Ethernet socketUSB Type-C — stated in the title and in all five bullets, named for machines and phones with a Type-C socket and no Ethernet of their ownUp to 2.5 Gbit/s — stated in the title and first bullet; the third bullet presents it as an upgrade from a 1 Gbit/s network when paired with 2.5-gigabit switches and routers. No BASE-T designation is printed
Cable Matters 201453-N, 2.5-gigabit Type-C adapter with a 140 W charging socket $35 Not published on the listing — the page names USB-C and Thunderbolt 3, 4 and 5 hosts, and USB-PD 3.1 for the charging socket, and never gives a USB data generation for the adapter itselfNot published on the listing for the host link — no figure in gigabits per second is attached to the USB side. The only rate on the page, up to 2500 Mbit/s, belongs to the Ethernet socketUSB-C, on a braided pigtail lead, with a second USB-C socket on the body for power. The second bullet states that the built-in USB-C power socket supports charging to 140 W under USB-PD 3.1 for compatible machines, naming a 16-inch MacBook Pro as an example, and that charging and the 2.5-gigabit connection run at the same timeUp to 2500 Mbit/s — stated in the first bullet, described as a good deal more than a conventional one-gigabit adapter and named for 4K and 8K streaming, gaming, video calls and file transfers on a local network. No BASE-T designation is printed
ASUS USB-C2500 V2, 2.5-gigabit adapter with its Windows driver on board $50 USB 3.0 — on ASUS's specification page and in the fourth bullet, which names compatibility with a USB 3.0 portNot published — no figure in gigabits per second is attached to the USB side; the rates on the page, 2.5G, 1G and 100 Mbit/s, belong to the Ethernet socketDisputed — ASUS's specification page gives a USB 3.0 Type-C input; the Amazon.com title calls it a USB Type-A adapter. The photographs on the listing are the thing to check2.5GBASE-T, with backward compatibility to 2.5G, 1G and 100 Mbit/s — stated in the Amazon.com title; ASUS gives 100, 1000 and 2500 Mbit/s

What separates the models, in network and storage gear

  • If price decides: this model, at $8.

The buyer this one serves, among network and storage gear

A laptop with a Type-C socket and no Ethernet, on a network already wired with Category 6 or better, where the gigabit is the whole requirement.

What this one costs among network and storage gear

A reference exists on these Amazon stores: France, Germany, Italy, Spain, United Kingdom, United States. Listed is not the same as in stock — availability changes daily.

Details checked on October 26, 2026.

What buyers actually choose

Amazon reports what buyers took in the month before this page was last checked: at least 5,000.

The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.

Sources

Specifications: the manufacturer sheet for network and storage gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.

What we look at on this network and storage gear

Elsewhere on the network

All USB network adapters compared

Every price named in a summary was read on the date that review carries. What a shop asks today is shown beside the product, and it moves.