No, it won't work. The PCIe version must match; 3.0 x 4 isn't compatible with 4.0 x 2.
No, it won't work. The PCIe version must match; 3.0 x 4 isn't compatible with 4.0 x 2.
On my motherboard, the available free ports are a PCIe 4.0 x2 port and a PCIe 3.0 x1 port. I need to fit a 10 gigabit NIC into the system, which requires compatibility with one of these two connections. I discovered this adapter: https://www.tp-link.com/us/home-networki...ter/tx401/. I’m unsure if it will work with my configuration. My motherboard details are: https://www.msi.com/Motherboard/PRO-X670...cification. The relevant specs show support for PCI-E x16, x4 and x1 slots. Currently, my setup only has x16 and x4 ports; the x2 slot is blocked due to physical constraints like USB headers and power indicators. This limits me to choosing between x2 and x1 for the NIC. Will this adapter reach full 10 gigabit speeds in the x2 port? If not, are there other NIC options that could handle it?
The card isn't designed for PCIe 4.0 but should work at PCIe 3.0 2x. It still offers about 20Gb/sec of speed, which seems sufficient. I'm puzzled why it needs a 4x port for 10Gb speeds, but it's worth testing. If you try it in the lower 16x slot, there might be issues, so move it to the second 16x slot instead. Otherwise, it makes sense to opt for an AM5 board with dual Ethernet, like the ProArt x670e. The TPlink adapter appears to have a dedicated 4x port for PCIe 2.0 support, though this is just my assumption.
If it supports PCIe Gen 3, it will operate exclusively on that standard. Regarding dual lanes, you’d receive approximately half the capacity of an X4 configuration.
10 gbps equals approximately 1.25 GB/s using PCIe 2.0, which translates to about 500 MB/s per lane—realistically around 480 MB/s per lane. PCIe 3.0 delivers roughly 985 MB/s per lane, so you'd get around 950 MB/s per lane. A network card supporting 10 gbps should function in a PCIe 3.0 x1 slot, but you won't achieve the full 10 gbps; expect around 700–800 MB/s instead.