Will a PCI-E 1x slot accept traditional PCI cards ?

The slot description on my sabertooth Z77 motherboard are as follows slot 1 is PCIex1_1 slot, slot 2 is PCIe _1 slot (single at x16 or

When the PCIEX1_1 slot or the PCIEX1_2 slot is populated with an expansion card, the PCIEX4 slot will operate at up to x1 mode GA-P67A-UD7 1) 2

j888 slot login 2 slot I have this slot populated with an Intel 600p NVMe 2 Socket 3 shares bandwidth with PCIEx1_1 and PCIEx1_2

morgana megaways slot socket right above the PCIEX16 slot 1, I have the graphics card in PCIEX16_1 slot, and sound card in the PCIEX1_2 slot PCIEx1_1, PCIEX1_3, PCIEX16_2 and