as usual, but I suspect you're misinterpreting the reference to "Intel"...
My guess is that you are looking at ethernet cards described as "Intel". You are taking this to mean that they are meant to run on PCs with Intel processors, whereas I suspect it means that the card is manufactured with an Intel chip somewhere on the card.
If I'm correct this will not be a problem. I have fitted such an Intel card into a PC with an Athlon processor, and it worked fine.