What does the ASRock DeskMini B660 add to the DeskMini family?

The ASRock DeskMini B660 adds a PCIe 4.0 NVMe slot, giving you two M.2 slots — one at PCIe 4.0 x4 and one at PCIe 3.0 x4 — plus the usual 2.5-inch SATA bay. The Gen 4 slot doubles bandwidth for compatible SSDs over older models, making it ASRock’s best option for fast NVMe storage in a tiny chassis.