The slot, the lanes and the controller settle it before the port speed does · review
DIGITUS DN-10136, four-port 2.5-gigabit server card on a Realtek RTL8125B review
A four-socket 2.5-gigabit server card whose Amazon.com page is a title and a description: PCIe 2.1, four RJ45 ports and a Realtek RTL8125B chipset, with no lane count, brackets or operating systems.
The title: DIGITUS network adapter, PCIe 2.1, 10/100/1000/2500BASE-T × 4. There are no bullets. The description names four RJ45 ports and the RTL8125B chipset, and calls it a server NIC.
The shelf it sits on
Card
Sockets
Speed
Controller
Bus stated
Brackets
Amazon.com, October 26, 2026
VIMIN
1
2.5G
Realtek RTL8125B
fits ×1 to ×16
standard and low-profile
$17.98
YuanLey
1
2.5G
Realtek RTL8125B
fits ×1 to ×16
standard and low-profile; heat sink
$17.98
GiGaPlus
1
2.5GBASE-T
Realtek RTL8125B
fits ×1 to ×16
standard and low-profile; heat sink
$19.98
TP-Link TX201
1
2.5G
not named
not stated
full and low-profile
$26.99
10Gtek X540-T2
2
10G / 1G / 100M
Intel X540
PCIe 2.1 ×8
standard and low-profile
$49.99
DIGITUS DN-10136
4
2.5GBASE-T
Realtek RTL8125B
PCIe 2.1
not stated
$92.07
KALEA-INFORMATIQUE
2
2.5GBASE-T
two Intel I226
PCIe 3.1 ×1
high and low-profile
no offer
The lane count
Four sockets at 2.5 Gbit/s add up to 10 Gbit/s. On PCIe 2.1, a single lane carries about 4 Gbit/s; whether the card uses one, two or four lanes decides whether the four sockets can run flat out together. The page does not say.
The price
$92.07 on October 26, 2026, the most expensive card here.
Prices quoted in this text were read on October 26, 2026. The live price is at the top of the page.
Where it holds up, and where it stops
Strengths
Four 2.5-gigabit sockets, the most on this shelf
PCIe 2.1 and the Realtek RTL8125B chipset named
Compromises
No lane count, on a card whose four sockets need more bus than one PCIe 2.1 lane gives
No brackets, cooling or operating systems named
$92.07 on Amazon.com on October 26, 2026, the highest price here
Specifications
PCIe generation
PCIe 2.1 — stated in the title
Lane count
Not published on the Amazon.com listing — the "x 4" in the title counts the sockets, not the lanes
Port speed standard
10/100/1000/2500BASE-T — stated in the title
Port count
Four — stated in the title and the description as four RJ45 ports
Controller family
Realtek RTL8125B — named in the description as the chipset
Bracket heights supplied
Not published on the Amazon.com listing
Cooling arrangement
Not published on the Amazon.com listing
Stated operating system support
Not published on the Amazon.com listing — no operating system is named
Amazon reference
B0C7KRJNM1
EAN
4016032487968
On Amazon.com
Amazon.com had an offer at $92 on October 26, 2026.
The questions that come up before an order
Will all four sockets run at 2.5 Gbit/s at once?
The page does not give the lane count. Four sockets at 2.5 Gbit/s add up to 10 Gbit/s; a PCIe 2.1 lane carries about 4 Gbit/s, so at least ×4 is needed for all four at full speed.
Which drivers does it use?
The description names the Realtek RTL8125B, the chip on the single-socket VIMIN, YuanLey and GiGaPlus cards here; Realtek publishes the drivers.
Our score
7.0/ 10
Four 2.5-gigabit sockets and a named chipset on a page that says almost nothing else. The lane count is the figure to obtain before ordering.
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
PCIe generation
Lane count
Port speed standard
Port count
DIGITUS DN-10136, four-port 2.5-gigabit server card on a Realtek RTL8125B
$92
PCIe 2.1 — stated in the title
Not published on the Amazon.com listing — the "x 4" in the title counts the sockets, not the lanes
10/100/1000/2500BASE-T — stated in the title
Four — stated in the title and the description as four RJ45 ports
Not published on the listing — the third bullet lists the connectors the card goes into and gives no generation for them, and no other bullet returns to the subject
Not published on the listing as a figure for the card — the third bullet names the connectors it fits as ×1, ×4, ×8 and 16, the last of them printed without its multiplication sign, and adds that a PCI slot will not do
2.5GBASE-T — stated in the third bullet in that form, with the title giving 2500 Mbps and the second bullet giving backwards compatibility at 2.5 Gbps, 1 Gbps and 100 Mbps
One — the third bullet turns a PCIe connector into one 2.5G Ethernet RJ45 socket, in the singular, and the title names a single interface adapter
Not published on the Amazon.com listing as a figure for the card — the fifth bullet lists the slots it fits, ×1, ×4, ×8 and ×16
2.5 Gbps, 1 Gbps and 100 Mbps, negotiated automatically — stated in the second bullet
One — the second bullet names the 2.5G Ethernet port in the singular
What separates the models, in network and storage gear
If price decides: VIMIN 2.5G PCIe card on a Realtek RTL8125B, at $18.
The buyer this one serves, among network and storage gear
A server or a router build that needs four 2.5-gigabit sockets from one slot, once the lane count has been confirmed with the maker.
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.
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.
two RJ45 sockets · 10G / 1G / 100M · Intel X540 · PCIe 2.1 ×8 · Cat 6A to 100 m, Cat 6 to 55 m · two brackets · 3-year warranty
The only ten-gigabit card on this shelf: two copper sockets on an Intel X540, PCIe 2.1 ×8, with its cable grades, its distances and a three-year warranty stated — $49.99 on Amazon.com on October 26, 2026.
Best for: A server, NAS build or workstation with a free ×8 or ×16 slot and a 10GBASE-T switch, running Windows Server, Linux or ESXi.
one 2.5GBASE-T socket · Realtek RTL8125B · Wake on LAN · fits ×1, ×4, ×8 and 16 · two brackets · heat sink · driverless on Windows 10
A single-socket 2.5-gigabit card on a Realtek RTL8125B with Wake on LAN, a heat sink and both brackets, that says where its drivers come from on every system but Windows 10.
Best for: A desktop moving to 2.5-gigabit where Wake on LAN and a heat sink are wanted and the driver will be fetched from Realtek on Linux or macOS.
two RJ45 sockets · 2500/1000/100/10 BASE-T · PCIe 3.1 ×1 · dual Intel I226 SRKTU with an ASM bridge · high and low brackets · jumbo frames to 9.5 KB
A dual-socket 2.5-gigabit card on two Intel I226 controllers that publishes its PCIe generation and lane count — 3.1 ×1 — and puts both sockets behind that single lane.
Best for: A small server or a workshop machine that needs two separate 2.5-gigabit sockets from one slot, where the ×1 requirement is a fit rather than a compromise.
