yep, oc'ing requires high performance ram.. normal value rams can help you a little bit only..

but there are some value rams that can be oc'ed high.. all you gotta do is loosed the timing somemore.. probably put 6-6-6-18 like that..

just use the loose timing 3-4-4-8 or 3-4-4-10 max and then use divider... (eg 2:1)

then raise the HTT slowly as high as you can.. then raise the vcore by 0.01-0.02volt.. then raise HTT again.. and for the vdimm just stick to 2.5-2.6volt... or if you dare enuff 2.8vdimm...

oh ya.. make sure you lower the HTT multi to 4x..

goodluck..

-edit-.. 1.65 vcore?? that's quite high mate..