Level1Techs has highlighted a totally unique function exclusive to certain ASRock motherboards. They were provided with a special edition B650 LiveMixer motherboard with an additional expansion card. This is where it should be noted that neither this motherboard nor its expansion card is available for purchase.
Their unique B650 LiveMixer motherboard comes with an X670 XPANSION KIT, which adds a supplementary chipset to the motherboard. As is common knowledge, AMD X670 motherboards utilize two Promontory21 chipsets, whereas B650 motherboards only have one. Thus, the board might match the specifications of a full-fledged X670 board by putting an additional chipset on the expansion card directly.
The motherboard features two PCIe x4 NVME M.2 slots, three USB Type-A, one USB Type-C 10Gbit, two SATA connections, and a 10 Gbit Ethernet port (the motherboard offers 2.5 Gbit without the card). This expansion card relies not just on the PCIe connector but also on a dedicated control line and is, therefore, only compatible with specific ASRock motherboards. Not only is it unavailable for purchase, but it also requires a specialized motherboard. This motherboard was supplied to Level1Techs, and its BIOS appears to be customized.
According to the reviewer, ASRock is only testing the waters with its concept, which is sure to attract a large number of fans. Customers would be able to upgrade their motherboards in the future if a product like this were ever to hit the market.
Images Credit: Level1Techs