AMD 9 series chipset will use theSocket AM3 + processor interface, you can continue installation existing Socket AM3 processors, but not the other way, which is now AM3 motherboards can not install the AM3 + bulldozers processor, new motherboard will also support other Turbo Core 2.0 second-generation dynamic multi-core acceleration technology.
List of Chipsets:
- 990FX:supports two full speed PCI-E 2.0 x16 slot and can be split into four PCI-E 2.0 x8 slot half speedcan be set up to dual quad CrossFireX, the other to support a PCI-E 2.0 x4 slots Six PCI-E 2.0 x1 slots.
- 990X:to support a PCI-E 2.0 x16 slot and can be split into two full speed PCI-E 2.0 x8 slot half speedcan be set up dual CrossFire, also supports six PCI-E 2.0 x1 slots.
- 970:support for a PCI-E 2.0 x16 slot at full speed and can not be split, that is, do not support CrossFire.
South Bridge are SB950, SB920 two models, the main difference is that RAID technology, but are not native USB 3.0.
- SB950: supports four PCI-E 2.0 x1 slots, PCI bus, 14 USB 2.0 interface, six SATA 6Gbps interface, supportRAID 0/1/5/10,can be used with 990FX, 990X, 970.
- SB920: supports four PCI-E 2.0 x1 slots, PCI bus, 14 USB 2.0 interface, six SATA 6Gbps interface, supportRAID 0/1/10,mainly with 970.
Source: Mydrivers.com (Chinese) - English Translation





