Help understanding PCIe 16x8x16x8x

For actual usage you should probably use something like this rcKGqG for a 1x to

A PCIe card and mainboard will negotiate the connection to the fastest supported by both So a x4 card will fully utilize a x4 slot

can you connect pcie 40 in 30 slot If you have limited expansion slots on your motherboard and all you have available is an

can we book visa slot without i20 Both cards function fine in the bottom PCIe 4x slot but refuse to function in any of the alternate PCIe 16x slots I currently have