Id say leave ur HT and NB around there and same for voltage and dump the freq to what u want, unless as u said the 3.3 attemp was with the same settings. When u overclock a non black edition cpu, usually its best to lower ur ram freq, but the NB and HT are prob good, how far did u attempt to bump up ur voltages?
My x6 with very similar settings got to 3.7 beside the ram. Also beside not every cpu can hit the same freq, it also matters on the board.
Ya my stock freq i think is 400mhz ive clocked the dram frequency to 326.7mhz and my cpu clock speed i raised to 3.430 mhz, everything seemes stable so far ill keep doing some more testing on prime95 and keep you posted!
So i tried to go to 3.5mhz with the vcore at 1.4v and my ram clock at 266mhz, i ran prime95 for 5minutes and it gave me a rounding error ".5 expected less then .4" i cant seem to pinpoint whats holding my overclock back. Any ideas?