That’s because AMD licenses the x86 patents from intel and Intel licenses the amd64 patents from AMD. There are a few other niche x86 licensees (VIA, DM&P, etc.

That’s because AMD licenses the x86 patents from intel and Intel licenses the amd64 patents from AMD. There are a few other niche x86 licensees (VIA, DM&P, etc.) that don’t make anything in the high end market.