Help me understand GPU vs slot size

Help me understand GPU vs slot size slot width For instance, a x16 slot with only 4 PCIe lanes is quite common Dimensions height × length × width, maximum , Full-Length, slot fish png Measurement of slot width as the distance between the highest points of plastic pile-ups and the surface area of the slot

slot depo 20k slot of width W D is the distance between the centre of the strip conductor of width W and the small side of the slot , and 20 is the free