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

Last response: in Overclocking
May 23, 2009 11:50:56 PM

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

More about : stable multi fsb

May 24, 2009 12:16:42 AM

Have you tried OCing with the multiplier when the 4th core is locked?
May 24, 2009 10:25:29 AM

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
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May 24, 2009 7:54:08 PM

Sorry for being no help here (O/Cing noobie :lol: ) but I was wondering how long you run OCCT for?
June 1, 2009 7:12:18 PM

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
June 3, 2009 2:26:32 AM

Try Prime95. Track your temps with CoreTemp, RealTemp or SpeedFan.
June 6, 2009 8:11:40 AM

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)
June 6, 2009 3:56:45 PM

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