PCIe X1 to X16 Slot Extension Adapter Add-on Cards & Peripherals

The specs table says, 1 x PCIe x16 slot, running at x4 Does this mean this x16 slots header only has 4 PCIe lanes? Similarly

PCIE cards are backwards compatible with the and the slots, but you won't be able to enjoy the full extent of your new PCIE card

1001liga slot The PCIe cards are available in different sizes and rated as X1, X4, X8, X16 The smaller cards will fit perfectly in the larger slots but not vice-versa

10 times slot machine I recently got an LSI 2308, and have not had a chance to test it yet My motherboard only has one PCIE x16 slot ,