Deliberately filed this here rather than in Networking, as the question is about generic to the millions of; motherboards sold, best-buy PC's on sale, and free fibre routers given away on contract. For the last decade at least EVERYTHING has been 1Gbe, but we finally moving beyond that now having options emerge at the high-end for: 2.5Gbe 5Gbe 10Gbe But I'm pretty sure we're going to settle on one mainstream standard around which the enormous bulk of mainstream motherboards/prebuilt-pcs/routers will coalesce around. But which will it be... People talk of the downside of 10Gbe in requiring SFP or Cat6 cable, but on short runs it can work fine on cheap cabling. People talk of the upside of realtek 2.5Gbe being cheap-as-chips, but is it that much cheaper than 5Gbe for people to forgo a doubling of the speed. Is 5Gbe the goldilocks of the future standards, in being nearly as a cheap as 2.5Gbe, nearly as fast as 10Gbe, and able to run on the billions of miles of installed Cat5e... My question to you: In five years time is Best Buy, Ebuyer, Netgear overflowing with just [one] of the above three standards?