yeah, the HTT is 200MHZ per RAM disk. overall the HTT has 1000MHZ for RAM in total. then it has 1000MHZ for the other things.
if you see other CPU's (ones not in socket 754, 939 or 940) the equivalent to HTT is FSB.
normally, a CPU will talk to a memory controller on the motherboard if it wants to communicate with RAM. the link between CPU and memory controller is called the Front Side Bus (FSB).
on socket 754, 939 and 940 systems (Athlon 64's, Opterons and some Semprons) they have a memory controller on the CPU itself. therefore the FSB is inside the CPU and runs at the CPU's speed. the link between CPU and RAM on these systems is called Hypertransport (HTT)