I don't think you understand, testing max htt/fsb doesn't mean testing the 5x multi.
It means testing for the highest CPU frequency with all other variable set low.
To isolate and test the max htt/fsb, drop the htt multi to 600/3x, drop the CPU multi to 6x, drop the dram frequency to 100. Then increase the CPU frequency as high as it will go, you may have to increase the NB voltage and/or the LDT voltage once you get near or past 300.
Then to test for max clock, keep all the settings as above except raise the CPU multi to max which I believe is 9x for your CPU, and increase CPU frequency as high as you can go. And increase the vcore as you go up