Gigabyte 990FXA-UD5 Motherboard

Slots

The Gigabyte 990FXA-UD5 comes with five PCI Express x16 slots, one PCI Express x1 slot, and one standard PCI slot.

The first PCI Express x16 slot (PCIEX16_1) always runs at x16 speed; the second PCI Express x16 slot (PCIEX4_1) always runs at x4 speed; the third PCI Express x16 slot (PCIEX16_2) always runs at x16 speed; the fourth PCI Express x16 slot (PCIEX4_2) always runs at x4 speed; and the fifth PCI Express x16 slot (PCIEX8) always run at x8 speed. This way, in order to achieve the best performance if you are installing two video cards, you should install them in the first and third slots, not in the first and second slots as it would appear more logical.

There is no space between the PCI Express slots, so if you install a dual-slot video card in any PCI Express x16 slot, you will “kill” the slot right next to it.

All PCI Express x16 slots support both CrossFireX and SLI modes.

Gigabyte 990FXA-UD5 motherboardFigure 2: Slots

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Author: Gabriel Torres

Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.

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