Can't get a stable oc with the multi but can with fsb?

[the1tarheel]

I have an AMD Phenom II 720 BE with the 4th core unlocked on a Biostar 790GX board.
at stock OCCT runs fine. When I try to bump the multi (even 14.5 from 14 ) Fail OCCT

I set the cpu voltage from stock 1.325 up to 1.400 so far and no luck it fails each setting in core#0
But when I set fsb up to 230 x 14 +3.220 no problem running OCCT

I know this is limited info

Any ideas what info I need to get more help on this

 

[spinetap]

Have you tried OCing with the multiplier when the 4th core is locked?

 

[the1tarheel]

Ok tried both ways - with the 4th core locked, and unlocked and no go on each.
tried both ways on small information setting and no problems, medium runs a minute or so and the large test quits within seconds.

seems I need to find out more info thanks for the help

 

[AKM880]

Sorry for being no help here (O/Cing noobie :lol but I was wondering how long you run OCCT for?

 

[the1tarheel]

I run OCCT for the minimum 6 minutes and it usually will not make it through the first minute without error (I use medium setting

 

[AKM880]

Try Prime95. Track your temps with CoreTemp, RealTemp or SpeedFan.

 

[the1tarheel]

Seems everyone on every forum gave me the answer -- never leave anything on auto ( had memory set @ auto / once I set timings manually has been stable on all four cores @3.4 for 2+ hours so far on medium settings in OCCT)

 

[AKM880]

Good job! Make sure you stress test for more than 6+ hours though,