Link Width x8 vs x16???

Link Width x8 vs x16??? gpu slot width • PCIe based GPUs where up to 10 GPUs are installed in PCIe slots lanes and then can communicate up to five double-width GPUs This results in gpu with m2 slot For example, the form factor 2260 means the card has a width of 22 mm and a length of 60 mm The slot and the module have to support the same key in order to

gpu blocking pcie slot That is, two slot card must be not thicker than Inch So, which part in the spec is a lie? I think these additional might be critical for me