What is PCIe x1 slot used for? - STC-Cable

Will a PCI-E 1x slot accept traditional PCI cards ? pciex1_1 slot Having read about the possible problems with on-board USB I purchased the recommended Inateck PCIe card, which I've installed in the top expansion slot blue ribbon slot rtp 1 x PCI Express x16 slot, running at x4 * The PCIEX4 slot shares bandwidth with the PCIEX1_1 and PCIEX1_2 slots When the PCIEX1_1 slot or the PCIEX1_2

eastern emeralds slot So I've been wondering if PCIE x1 slots can are as fast as my SSD? My SSD has around 500 mbs read and write, so I need the PCIE x1 slot to have