The Register Hardware spotted some good news today? It appears that AMD's current Socket AM2 will be compatible with upcoming Socket AM3 processors. However, Socket AM3 motherboards won't support AM2 processors.
As we have reported before, Socket AM3 is part of the DDR 3-supporting K8L architecture due H1 2008 and set to debut late 2007 in a dual-core chip, the codename of which remains unkown. This mysterious part will be followed by 'Greyhound', a 65nm quad-core Athlon 64 part - branded 'X4', presumably. The Athlon 64 FX version, due later in H1 2008, is codenamed 'Cadiz'.
The new architecture's integrated memory controller is believed to support both DDR 2 and DDR 3 - but not, AMD's OEM documentation states, on the same motherboard. K8L will also run on a HyperTransport 3 system bus.