ASRock Unveils Thunderbolt 4 Add-on Card | TechPowerUp
 
ASRock today unveiled the Thunderbolt 4 AIC, an add-on card that puts out two 40 Gbps Thunderbolt 4 ports in the USB-C form-factor, with DisplayPort 1.4 passthrough. The card works exclusively with ASRock's Intel 500-series chipset motherboards that have a special header needed by the card called "TBT_Header" (similar to the "TB_Header" on certain ASUS motherboards). In addition, the card needs a 9-pin USB 2.0 connection to one of the vacant headers on the motherboard.

The compact, yet full-height add-on card features a PCI-Express 3.0 x4 host interface, and is based on Intel JHL8540 "Maple Ridge" controller. It has two full-size DisplayPort 1.4 inputs, a pair of included DP cables lets you connect the card to your graphics card. The controller supports up to 5 devices in Thunderbolt daisy-chains. The DisplayPort passthrough supports resolutions of up to 5K @ 60 Hz. The card measures 8.4 cm in length, 10.41 cm in height, and is 1 slot thick. The company didn't reveal pricing.
 
A very nice addition for those who need Thunderbird 4 ports in my opinion.