On Mon, 2022-11-14 at 12:28 +0100, stefano gozzi wrote: > Please loot at this: > https://www.linuxquestions.org/questions/linux-networking-3/intel-x540-t2-network-card-installed-but-only-at-100mbit-cant-change-or-improve-4175686736/ > > It seems that you need a 8x pcie slot to work fine Thanks, the card is in an 8x slot and has been working fine with Fedora. I didn't change anything but using Debian instead of Fedora.