Techconnect.com has an article that lists all the various adapters necessary to use your peripherals (wired printers, external hard drives, monitors, iDevice connectors, etc.) with the new Thunderbolt 3 technology. Granted, Thunderbolt 3‘s power is amazing – can push up to 100W of power, the data transfer speed is 40Gbps, it can run two 4K monitors, and power tons of devices at once. But this power comes at a cost. Firstly – the only connective technology with which it’s directly compatible is USB-C. If you have ANY older devices, you’ll need to shell out more money for new adapters to suit your varying peripherals.
So, be ready – if you’re preparing to dish out between $2,400-$3400 on a new MacBook Pro – remember to build a few hundred more into your budget if you want to work with all your previous devices.
MacBook Pro Thunderbold 3 Adapter Guide (techconnect.com)