aactually, fsb used to mean the speed of communication between the processor and memory controller. so in an athlon 64 it would be the same as the cpu speed. the htt is the speed of communication between the cpu/mem controller and the rest of the system. the link, which is 1000 upstream and downstream each, communicates information from the proc/memcontroler and the memory/video card/pci bus.
this is basically useless over the 800 bus on 754, but will be needed once the dual core cpu's hit market and there is twice as much bandwidth being used. Wow, AMD planning ahead???