I curently use PPPoE on x86 with Intel 865 chipset, Celeron 2800, 2 Lan cards Realtek 8139C (for WAN and LAN)and ROS 2.9.51. This config works perfect with no isues at all ! I have to replace it because the CPU is 100% with more than 400 users online. I use 2.9.51 because I am not sure if v3.x has problem solved with packet loss with PPPoE.
I tried with P43 chipset intel core2duo E6300, NIC - PCIe Yukon Marvell, PCI Realtek rtl8139C, 8139D, even with RB44 ... etc. all combinatios ...didn't make it work longer than 1 hour. NIC suddenly stops working or very slow connection or after about 5 MB traffic I need to reconnect to make it work again and so ...
I would apriciate any sugestion about tested hardware config for x86.