IOCREST PCI-E 2.5Gbps NIC ( RTL8125B ) Benchmark
Below are some basic iperf benchmarks of the IOCREST PCI-E 2.5Gbps NIC. The adapter is confirmed to be using a Realtek RTL8125 series chip - specifically the marketing for this card states it's an RTL8125B, it simply shows as RTL8125 through lspci and lshw under the product field, however you can see under the configuration field it states firmware=rtl8125b-2_0.0.2.
This is a very common Realtek chip used for a lot of 2.5Gbps NICs and you'll likely see the same one in use across many similar cards across a range of vendors. The testing was performed using a direct connection between the NIC and another device that also has a RTL8125 based 2.5Gbps NIC.
The card costed me roughly ~$16 AUD from AliExpress.
Hardware details
$ sudo lshw -class network
*-network
description: Ethernet interface
product: RTL8125 2.5GbE Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: <REDACTED>
logical name: <REDACTED>
version: 05
serial: <REDACTED>
size: 2500Mbit/s
capacity: 2500Mbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd 2500bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=6.8.11-300.fc40.x86_64 duplex=full firmware=rtl8125b-2_0.0.2 07/13/20 ip=192.168.2.20 latency=0 link=yes multicast=yes port=twisted pair speed=2.5Gbit/s
resources: <REDACTED>
TCP test
$ iperf3 -c 192.168.2.50 —bidir
Connecting to host 192.168.2.50, port 5201
[ 5] local 192.168.2.20 port 37664 connected to 192.168.2.50 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 282 MBytes 2.36 Gbits/sec 0 403 KBytes
[ 5] 1.00-2.00 sec 282 MBytes 2.36 Gbits/sec 0 1.02 MBytes
[ 5] 2.00-3.00 sec 281 MBytes 2.36 Gbits/sec 0 1.08 MBytes
[ 5] 3.00-4.00 sec 281 MBytes 2.36 Gbits/sec 0 1.08 MBytes
[ 5] 4.00-5.00 sec 280 MBytes 2.35 Gbits/sec 0 1.08 MBytes
[ 5] 5.00-6.00 sec 280 MBytes 2.35 Gbits/sec 0 1.08 MBytes
[ 5] 6.00-7.00 sec 280 MBytes 2.35 Gbits/sec 0 1.08 MBytes
[ 5] 7.00-8.00 sec 281 MBytes 2.36 Gbits/sec 0 1.08 MBytes
[ 5] 8.00-9.00 sec 280 MBytes 2.35 Gbits/sec 0 1.08 MBytes
[ 5] 9.00-10.00 sec 281 MBytes 2.36 Gbits/sec 0 1.08 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 2.74 GBytes 2.36 Gbits/sec 0 sender
[ 5] 0.00-10.00 sec 2.74 GBytes 2.35 Gbits/sec receiver
iperf Done.
UDP test
$ iperf3 -c 192.168.2.50 -u -b 3000m —bidir
Connecting to host 192.168.2.50, port 5201
[ 5] local 192.168.2.20 port 38381 connected to 192.168.2.50 port 5201
[ ID] Interval Transfer Bitrate Total Datagrams
[ 5] 0.00-1.00 sec 285 MBytes 2.39 Gbits/sec 206411
[ 5] 1.00-2.00 sec 285 MBytes 2.39 Gbits/sec 206424
[ 5] 2.00-3.00 sec 285 MBytes 2.39 Gbits/sec 206405
[ 5] 3.00-4.00 sec 285 MBytes 2.39 Gbits/sec 206393
[ 5] 4.00-5.00 sec 285 MBytes 2.39 Gbits/sec 206413
[ 5] 5.00-6.00 sec 285 MBytes 2.39 Gbits/sec 206369
[ 5] 6.00-7.00 sec 285 MBytes 2.39 Gbits/sec 206419
[ 5] 7.00-8.00 sec 285 MBytes 2.39 Gbits/sec 206419
[ 5] 8.00-9.00 sec 285 MBytes 2.39 Gbits/sec 206381
[ 5] 9.00-10.00 sec 285 MBytes 2.39 Gbits/sec 206396
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.00 sec 2.78 GBytes 2.39 Gbits/sec 0.000 ms 0/2064030 (0%) sender
[ 5] 0.00-10.04 sec 2.71 GBytes 2.31 Gbits/sec 0.009 ms 0/2064029 (0%) receiver
iperf Done.
The results are on par with my expectations and I haven't had any compatibility issues with the device across different operating systems.