which pcie slot for graphics card
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The second PCIe ×16 slot has contacts for only four lanes, which can be useful for SSD cards, for example. The two short PCIe ×1 slots, on the other hand, find their use for a sound or network card.
SSD M.2 PCIe
If you do not have an M.2 slot, you can purchase an M.2 PCIe adapter which is installed like a graphics card; the M.2 SSD is installed in the adapter.
Testing a x16 graphics card in x8 results in no performance difference ...
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