Lowest possible HT multi seems to be indeed 1x. I have not yet seen sub 5x.

This is the responsible register.


Will try to modify this register with baredit tomorrow to see if it's possible to use lowert than 5x on the asrock and gbt boards whom only allow 5x min via bios. With 5x I'm hitting a wall at 280MHz and i'd need abit more to beat 9500 wr.