PCIe 16x Video Card
A PCI Express, Version 1 high-end video card using PCIe x16 slots.
Only graphics cards are inserted into a PCIe x16 expansion slot.
PCIe
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PCIe or USB 2.0 bus standards.
A PCIe x16 graphics card will not work in a normal PCI slot. PCIe or PCI Express is a new standard in expansion interfaces. PCIe is physically and electronically incompatible with PCI slots.
Is used by High-end video card using PCIe x 16 slots to provide extra voltage to the card.
A card which goes in a special slot in your computer
I presume that you mean to ask whether a PCIe 3.0 card can be used in a PCIe 2.0 slot on your motherboard. The answer to that question is yes. PCIe standards are all backward-compatible, so do not sweat that. For best performance, however, you would prefer to put a PCIe 3.0 card in the same type of slot.
Is to supply additional power for PCIe video cards Original answer SATA data cables. To provide additional wattage for PCIe video cards