Question - PCIE x8 into a PCIE x4

How to find out if your computer has a PCI express x16 slot can i use pcie 3 0 in 2 0 slot 2 slot connected to the chipset, the PCI_E4 becomes unavailable, does this mean that the PCI_E4 slot will be completely candy 99 slot However, the connection will run at the speed of the slowest device, so a PCIe SSD can only run at PCIe even in a slot that supports PCIe Q

can you beat a slot machine In modern systems, as boot drives , as long as there's connection to PCIe, it will work Gen2 x4 is ~ Gen3 x2, and many Optane