ECS A890GXM-A Motherboard
Slots
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AMD 890GX chipset has one PCI Express 2.0 x16 lane that can be split-up into two x8 lanes if necessary. Translation: motherboards based on this chipset
can have one or two x16 PCI Express slots, but they will work at x8 if two video cards are installed. The north bridge chip supports a total of six PCI Express x1 lanes, while the south bridge chip supports two more.
ECS A890GXM-A comes with three PCI Express x16 slots. The first two (red ones) work at x8 if both are used at the same time, while the third slot (orange one) always work at x4 (using four x1 lanes from the north bridge chip). All slots support CrossFire mode, as expected.
The motherboard also comes with two x1 PCI Express slots and one standard PCI Express slot.
Notice how this motherboard requires a standard peripheral power connector to be installed in order to provide extra current to the PCI Express slots.
Figure 4: Slots.