While the labels themselves are just markers, the technology behind the headers they represent differs significantly: USB_E12 (Typically Gen 1) USB_E34 (Typically Gen 2/USB4) 10 Gbps - 40 Gbps Common Protocol USB 3.2 Gen 1 USB 3.2 Gen 2 / USB4 Best Use Case Keyboards, Mice, Basic USB Drives External SSDs, 4K Video Editing Power Delivery Standard (up to 4.5W-100W with PD) High (up to 100W-240W) Which One Should You Use? How to Identify Different USB Types: A Brief Guide - Anker
Once upon a time, in the cramped, cable-strewn landscape of a mid-tower chassis, lived a PC builder named Leo. Leo was staring at a 9-pin connector labeled "USB" and two identical-looking slots on the bottom edge of his motherboard: one marked and the other USB_E34 . usb e12 vs usb e34