My overclock Phenom II

[itsakjt]

CPU freq 3.906 GHz at 1.378V LLC on

NB clock at 2.821 GHz 1.281 V LLC on

RAM at 1736 MHz 9-9-9-24-1T at 1.59 V

 

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[Olesius]

not bad

 

try lower memory timing, it will increase your perfomance too

[itsakjt]

Yeah I know. But highly unstable.

[Olesius]

did you try higher dram voltage? such as 1.65-1.68?

 

maybe your cpu IMC is not good and AMD chips do not like high memory freq...

[itsakjt]

Yes I tried upto 1.71V but still it is unstable. I think maybe its the IMC. Also increasing the IMC from 2.8 GHz to 3.0 GHz increases performance a lot but I can't make it stable.

[Olesius]

try lower memory freq, maybe it solve your problem

 

in addition, i think you have bios option for IMC such as CPU-NB?

[itsakjt]

No it does not solve the problem even at 1600 MHz. The closest I can get is 1333 MHz at 7-7-7-20. But the current setting is better than that one. And yes I have the option for CPU-NB. I set it to 2.8 GHz and its is stable. When I go past 2.9 GHz, instability shows up.