AMD's hammer with a new bus
AMD will not use the current EV6 bus architecture of the Athlon and Duron CPUs in the upcoming 64bit CPU 'Hammer'. A new NUMA architecture (Non-Uniform Memory Access) will be used with the Hammer, with which 8 or more processors are possible in one system.
NUMA should use the Lightning Data Transport (LDT) system bus for data transfer between CPU, memory and input/output devices. AMD sees the new NUMA architecture as a great advantage over Intel's IA-64 architecture, since with NUMA every processor has full access to the system bus and does not have to share it with the other processors, as with Intel. NUMA has the disadvantage of a longer access path to the memory, which AMD wants to compensate for with the LDT bus. With the AMD-760MP chipset, which will be available soon, dual-Athlon systems will be possible for the first time. When the AMD-760MP and the corresponding mainboards will be available in stores has not yet been announced.