A PCIe card receives its power through the PCIe slot it is inserted into on the motherboard, which provides a standard voltage of 3.3V. Additionally, more power-hungry cards, such as high-end graphics cards, may require additional power connectors from the power supply unit (PSU), which can provide extra power through 6-pin or 8-pin connectors. This combination ensures that the card has sufficient power to operate effectively.
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.
Yes, a GDDR5 graphics card can be compatible with a Sabertooth 990FX motherboard, provided that the graphics card uses a PCIe interface, which the motherboard supports. The Sabertooth 990FX typically has PCIe x16 slots suitable for modern graphics cards. However, ensure that your power supply meets the requirements for the specific graphics card you intend to use.