AMD still have room left for Mhz increases. 90nm will see 3 Ghz for sure (FX 59). 3 Ghz single opterons are on the map for Q1 2006, so this is sign theres room left. 65nm work IBM will help them a bit more, Id say 3.4 Ghz is tops for the FX. Then if they keep it single core at 45nm who knows.