The 2021-era datasheet reveals a chipset designed for maximum throughput and compatibility. 2.1 Interface & Protocol Support
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You can use the Realtek RTL9210B MP Tools (often found on forums like inside9 or various GitHub mirrors) to check your current firmware version.
The following table summarizes the core electrical and protocol specifications of the RTL9210B, as per the official datasheet guidelines:
Automatically detects whether a PCIe or SATA SSD is plugged in and adjusts accordingly 1.2.5. rtl9210b datasheet 2021
From a protocol perspective, the bridge supports both (Bulk-Only Transfer) and the more advanced UASP (USB Attached SCSI Protocol). UASP enables command queuing and simultaneous command processing, which translates to significantly higher random I/O performance compared to legacy BOT—a critical advantage for SSD applications. The chip also supports USB Link Power Management (LPM), further enhancing power efficiency during idle and low-activity states.
The RTL9210B is firmware-dependent. The 2021 datasheet references firmware version as the initial production release, with key capabilities:
Compliant with PCI Express Base Specification Rev. 3.0 . In USB-to-PCIe mode, it supports PCIe Gen3 x2, providing up to 10Gbps bandwidth for NVMe SSDs.
PCIe Gen3 x2 interface, supporting NVM Express (NVMe) 1.3 protocol. SATA Mode: The 2021-era datasheet reveals a chipset designed for
Backward compatible with USB 3.2 Gen 1, USB 2.0, and USB 1.1.
Supports SATA Gen3 speed (up to 6Gbps) and is backward compatible with SATA Gen2/Gen1.
: Compatible with SATA Gen 1/Gen 2/Gen 3, supporting a maximum link speed of 6Gbps . Protocol Support :
Keep USB TX/RX lines at 90 ohms ±10%. PCIe/SATA differential pairs must maintain 100 ohms ±10%. I'll follow the search plan provided in the hints
Realtek released firmware 1.29.12 in late 2021 addressing most of these.
Mid-2021 Review | Part Number: RTL9210B-VC / RTL9210B-CG Vendor: Realtek Semiconductor Corp.
Some variants, such as the RTL9210BPD , even include support for USB Power Delivery 3.0 . RTL9210B-CG Datasheet 1.1 Arrowasia | PDF - Scribd