The RTL9210B is a high-performance bridge controller.
: Supports SATA Gen3 speeds, delivering up to 6Gbps bandwidth . rtl9210b datasheet
If you've ever bought a "universal" M.2 enclosure that works for both "M-Key" (NVMe) and "B+M Key" (SATA) drives, it’s likely using this chip. For enthusiasts, the official Realtek product page provides deeper details on its PCIe 3.0 LTR (Latency Tolerance Reporting) and MSI-X interrupt support. RTL9210B-CG - Realtek The RTL9210B is a high-performance bridge controller
