AMD grows very own Opteron chipsets
 

Before AMD kicked its roadmap into high gear early in 2009, the Fiorano platform was described as the SR5690 I/O hub, which supported the I/O virtualization technology called IOMMU, short for I/O memory management unit. The other half of the chipset included the SP5100 southbridge. This chipset was created to support any RevF socket and added support for HyperTransport 3 links, which debuted with the quad-core "Shanghai" Opterons (sold as the 2300 and 8300 series) and which was were also cooked into Istanbuls (sold as the 2400 and 8400 series). HT3 interconnects have more than twice the bandwidth of the prior HT2 links. The Fiorano platform was also expected to bring support for PCI-Express 2.0 peripherals to servers as well.

http://www.channelregister.co.uk/200...rano_chipsets/