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You also can refer to official documentatio:[https://www.raspberrypi.com/documentation/computers/raspberry-pi-5.html#enabling-pcie Enabling PCIe]
After I forced Gen 3.0 speeds, in my many tests I found that some NVMEs were able to run stably, but some NVMEs caused some problems: such as slow startup and running laggy, really really laggy. As the official statement says:
The Raspberry Pi 5 is not certified for Gen 3.0 speeds, and connections to PCIe devices at these speeds may be unstable.
[[File:Nvme-test(pcie2).png]]