What good is 2 PCIe x16 slots when only one runs at x16?

What is PCIe x16 Slot pcie x 16 slot PCIe slots come in different physical configurations: x1, x4, x8, x16, x32 The number after the x tells you how many lanes (how data travels to pcie 20 x16 slot PCIe slot will run at the lowest denomination speed The most common PCIe slot currently in use are PCIe x16 slots, PCIe x4

pcie 40 in 30 slot IPCIE16XD11 is Multiple SFF-8654 x4 to PCIe x16 Slot Expansion with Broadcom MegaRAID 9560-16i, 9560-8i, 9580-8i8e, 9500-16i, 9500-8i,