One of the major new features is IOMMU, a new technology that seems primarily intended for improvements in heterogeneous computing on the desktop platform:
Like a traditional MMU, which translates microprocessor's virtual addresses to physical addresses, the IOMMU maps device-visible virtual addresses to physical addresses. The I/O memory management unit provides a secure, scalable, high-performance solution for I/O virtualization in client or server computers.Here's an overview of the three AMD 9-series Northbridge chipsets:
And these are the two new Southbridges:AMD 990FX - supports two PCIe 2.0 x16 slots (configurable as four PCIe 2.0 x8), 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 x8), 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 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;