AMD will use the new Socket F platform/infrastructure for it's quad-core processors (Barcelona's). It basically an extension of the AM2 line.
Socket F employs support for the Fully Buffered DIMM. Processors planned for Socket F will also likely support DDR3 and other technologies, like XD-RAM. But when such RAM is used on an FB-DIMM, no motherboard or CPU change is necessary to support the new RAM, as all FB-DIMMs use the same socket regardless of the RAM employed. This overcomes the old drawback of the Hammer architecture, with its integrated memory controller necessitating the replacement of the (potentially very expensive) CPU to support a new memory type.
Pictures of the new socket are below.
