Disclosed is a way to support PCIe NVMe Gen4 SSD Devices in addition to maintaining support for
PCIe NVMe Gen3 SSD’s and SATA and Hybrid drives like H10. Chipsets are being architected to
support PCIe Gen4 interface in the CPU for higher bandwidth devices such as graphics and high
speed SSDs. However, the I/O controller in the chipset maintains support for PCIe Gen3/SATA and
stops short of supporting PCIe Gen4 devices.
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INC, HP, "PCle GEN4 AND PCle GEN3/SATA DEVICES SWITCHING SCHEME", Technical Disclosure Commons, (January 08, 2020)