MSI was showing off something that no one else had at Computex this year, a USB4 add-in card which they are calling the MS-4489. This is the first official USB4 add-in card in the market. The card makes use of the ASMedia ASM4242 USB4 host controller. Much like Thunderbolt add-in cards, this card needs to be connected to your motherboard with a cable that will handle some of the communication between the USB4 controller and your system.
The really interesting thing about this card is that it offers 100 watt USB PD support on the primary USB-C port with the secondary port delivering up to 27 watts. The card also features two DisplayPort inputs if you wanted to use DisplayPort ALT mode over USB-C to connect displays to the card.
In order to deliver the 100W on the primary USB-C port MSI has added a 6-pin PCI-Express power connector on the end of the card. We should see many add-in cards like this later in the year not only from motherboard makers, but also some third parties.