Originally Posted by Xylene
I've looked through every menu and I can't find anything about the NB multiplier.
I know it's not a Biostar board but, are you sure Asus didn't move stuff around, rename it, and bury it like Biostar did?
After looking in your manual, I think your MB divider may be similar to how Biostar is doing theirs now only yours is far less hidden. Change your CPU/NB frequency to 1800MHz. I know that sounds counter-intuitive but, that's what you have to do with Biostar TA990FXE to even get the blasted CPU to OC in the first place. Biostar has a different name for it though. As soon as I changed the NB frequency on my TA990FXE the BIOS instantly saw I had manually set the CPU to 250 and it jumped the clock up to 3.5 MHz. I left the HT frequency to either AUTO or manually set it to 2000 MHz.
Anyway I could be completely off-base since you have an Asus board but it's worth a try. If I'm right though, setting the CPU Bus Frequency to 250 and the CPU/NB frequency to 1800MHz should set the CPU to 3.5 MHz. You will most likely need to alter your ram divider or speed though as this put a slight OC on my DDR3 1600 RAM taking it from 800MHz to 833 MHz.