ITEM NAME:2pcs USB 3.0 SATA 15PIN Cable PCI-E 1X to 16X Extender Riser Board Card Adapter 2pcs USB3.0 SATA 15PIN Cable PCI-E 1X to 16X Extender Riser Board Card Adapter SPECIFICATIONS.(4) SATA 15pin power cable, more powerful, will reduce the burden of the motherboard. Suitable for: 1X, 2X, 4X, 8X, 16X slot circuit board. 2 x PCI-E 16X Adapter. 6) Compatible with PCI-E 1X 4X 8X 16X slot of the motherboard.