PCIe x16 GPU card into a PCIe x8 slot?

PCIe x8 to x4 Extension Cable - ADT-Link pcie 8x slot Should work fine, it's the same as putting a 16x card in to a slot that's only wired for 8x or 4x, you don't get the full bandwidth but it will pciex1_1 slot I was looking into the card because the old GPU was just inserted into the slot and had no other power cables and 750 ti seems to be a similar

pcie x32 slot The MB manual says that the x8 slot shares bandwidth with the x16 slot Meaning, if I use the x8 slot, the x16 slot will operate in x8 mode