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The Biostar TA75A+ comes with two PCI Express x16 slots, two PCI Express x1 slots, and two standard PCI slots.
The first PCI Express x16 slot is connected directly to the CPU integrated PCI Express controller, and it always works at x16 speed. The second PCI Express x16 slot is connected to four PCI Express lanes on the A75 chipset, so it always works at x4 speed.
If you install a dual-slot video card in the first PCI Express x16 slot, you will “kill” the first PCI Express x1 slot, and if you install a dual-slot video card in the second PCI Express x16 slot, you will “kill” one of the standard PCI slots.
Figure 2: Slots