show all the clock and voltage?
and ram using?

@LBYuan

once u increase the HTT, not only the cpu speed will increase, HT link and ram speed also will increase together

So try to lower down the multiplier of HT link and ram divider 1st. and increase the htt back

and OC even its easy, you still need to have some knowledge. 1.7v is too much already. even 1.5v i wont recommend for long run.

dont confuse HTT with HT link

HTT = bclck
HT link =  hyperstransport that connects the components of the mainboard

already reduce the ram divider?
just noticed your mainboard is nvidia 61. my nvdia 61 chipset cant go above 215Mhz HTT   

actually what matter most is d board. pop a lemon chip onto a decent board, u mite still be able to squeeze some MHz outta it, pop a decent chip onto a crappy board & u get close to nothing...