Changes

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: