instead of posting a sarcastic remark stating that nobody helped you, perhaps you could have posted the answer to your question so that this thread may help others in the future.
this is the first time I saw this thread. I would have responded sooner otherwise. a quick Google search of "K9N SLI HTT" revealed the answer with little effort.
the option to change the HTT multiplier is under the "advanced chipset features" menu. the multiplier setting is the "MCP55(SB) to AM2(CPU) Frequency" and is displayed as a speed (ratio). 1000=X5, 800=X4, 600=X3, 400=X2, 200=X1