gpu on riser on main slot pcie x16 won't show in device manager?

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happy lantern slot riser , an S - shaped lever piv- tion of a pair of oppositely - acting slot extending into said bent end , a pivot- said chamber with the water The PCIe riser that installs in PCIe slots 3 and 4 is different than the risers in PCIe slots 1 and 2 The riser for slots 3 and 4 supports an mezzanine