Adapter 3D Club CAC-1520, USB 3.2 Gen1 Type-C to 2.5G NBASE-T
Adapter 3D Club CAC-1520, USB 3.2 Gen1 Type-C to 2.5G NBASE-T
I just acquired one of these adapters based on the Realtek r8152 for my ITX setup since the GPU is occupying the sole PCIe lane. I ran iperf3 to a server connected via 10G Ethernet with standard 1500 frames. Here’s what the results showed:
- Connecting to lcars, port 5201 in reverse mode, remote host lcars sent [5] local 192.168.1.94 port 35086 linked to 192.168.1.253 port 5201.
- Interval Transfer Bitrate ranged from 0.00–1.00 sec: 263 MBytes at 2.21 Gbits/sec, 264 MBytes at 2.22 Gbits/sec, and so on up to 265 MBytes at 2.22 Gbits/sec.
- Receiver speeds varied between 2.21 and 2.44 Gbits/sec depending on the interval.
- Overall, the transfer consistently hit around 264 MBytes per second with stable throughput.
I also noticed that changing the MTU to 9000 didn’t significantly improve performance; it slightly increased to 2.23Gbit but caused more retries and a brief spike to 2.44Gbit before settling. Real-world NFS transfers from the server seemed slower, peaking near 250MB/s with noticeable fluctuations, likely due to other clients using the same 1500 MTU.
I’m relieved the adapter worked well and am thinking about connecting the onboard Intel Gigabit directly to a spare NIC on the server for NFS backups. This could help balance speeds and improve response times.
You can connect your GPU via a virtual link to an actual USB C port.