When USB 3.0 launched in 2008, it promised speeds up to 10 times faster than USB 2.0. And while that’s technically true on paper, faster isn’t always better. The jump from 480 Mbps to 5 Gbps came with new signalling mechanisms, new power rules, and new electrical behaviours that the original USB 2.0 spec simply didn’t have to deal with. In certain real-world scenarios, USB 3 ports can actually cause more problems than their older, slower siblings. There are a few reasons why you might want to have an older, USB 2.0-based port instead, and these reasons are why motherboard manufacturers keep them around.