PCI vs PCIe: What's the Difference and How to Distinguish Them?

Can I use my card in the PCIe x1 slot and in the x16 slot at pci 1 slot 1 or 0 slots!? Wtf? Plus, lot miniPCIe cards are not properly There are no longer many PCI-E x16 on consumer boards because Crossfire and SLI pciex16 slot List of Motherboards with 1 PCI-Express x16 Slots: ASRock B760M-H, ASRock H610MAC, ASRock B760M-HDV, ASRock H610M-HDV+ D5, GIGABYTE B650M D3HP,

pcie 4 in pcie 3 slot ssd For example, my NIC is a ConnectX3 single port which is a x4 card That's not going to fit in a 1x slot