There will be three versions of AMD 9-series North Bridges that will be slightly different from each other:
AMD 990FX - supports two PCIe 2.0 x16 slots (configurable as four PCIe 2.0 x16), six PCIe 2.0 x1 slots, one PCIe 2.0 x4 slot, to be paired with SB950 I/O controller;
AMD 990X - supports one PCIe 2.0 x16 slots (configurable as two PCIe 2.0 x
, six PCIe 2.0 x1 slots;
AMD 970 - supports one PCIe 2.0 x16 slot, to be paired with SB950 and SB920 I/O controllers;
AMD 9-series south bridge chips will support the following:
AMD SB950 - four PCIe 2.0 x1 slots, 14 USB 2.0 controllers, PCI bus, six Serial ATA-600 connectors with RAID 0, 1, 5, 10 support;
AMD SB920 - two PCIe 2.0 x1 slots, 14 USB 2.0 controllers, PCI bus, six Serial ATA-600 connectors with RAID 0, 1, 10 support;
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