Overclocking AMD CPU's can be a bit complicated because there are so many settings that need to be adjusted...but once you get the hang of it, there's nothing to it. Whenever you change the CPU frequency, there's a domino effect on all other frequencies (PCIE, RAM, HT). To compensate, you need to adjust their settings so that they don't increase too much & limit the CPU overclock potential or cause system instability. The PCIE should always be locked at it's default of 100MHz. The RAM & HT buses should be kept reasonably close to their default speeds. Good move lowering the RAM setting to DDR667. But you also have to lower the K8-NB Ht setting. That *may* allow you to raise the CPU freq even higher to hit the 3.0GHz mark. These charts may help: http://www.overclock.net/amd-memory... What freq is your RAM currently running at...about 385-390MHz? Ideally you want it to run at 400MHz or slightly higher. What's hurting you is the 11.5x CPU multiplier setting. 11 x 270Mz will run the CPU at 2.97GHz with the RAM at approx 412MHz. But you still need to adress the K8-NB Ht setting. The HT bus is the product of the CPU freq x the HT multiplier. However, it's not always expressed as a multiplier in the BIOS. Many times there are settings given - 200MHz, 400MHz, 600MHz...1800MHz, 2000MHz, etc. If you divide this number by 200MHz (which is the default freq for ALL AMD CPUs), you can come up with the HT multiplier. I believe the default HT speed for your X4 is 1800MHz (aka 3600MHz)? 1800/200 = 9x multiplier. If you don't lower this setting as you increase the CPU freq to say, 270MHz, the HT bus will run at 9 x 270MHz = 2430MHz. That's way too high & can cause system instability. Not only that, but it *may* limit your CPU overclocking potential. If you were to lower the setting to 1400MHz (7x), the HT bus would run at a much more stable 7 x 270MHz = 1890MHz.

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Thanks fot the explanation on K8-NB HT. I was confused by it. I will try to do what you said. and then write the results here. The RAM is running at 421mhz

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well... tried 262 X 11.5 but it didn´t worked, I even lowered dram to 533mhz and K8-NB HT to 1,4ghz but the system didn´t start. Maybe 2,9ghz is the maximum I can achieve...

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"well... tried 262 X 11.5 but it didn´t worked" Lower the multipler from 11.5x to 11.0x

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Hi, by disabling cool and quiet in bios I was able to change CPU NB multiplier. I changed this option to 7x and was able to raise the CPu frequency to 270 X 11,5 =3105 wchich is not bad for this processor. But is there any program similar to cool and quiet and with the same functions that I could use in Windows(CpuIdle doesn´t work)? It's just because I don't like seeing the CPU always at top speed (though the CPu temps are ok)

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Cool 'n' Quiet is a deterent to overclocking, that's why I recommended disabling it in response 3.

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Hi again. Today I've decided to try windows 7 RC 64bits. Unfortunately, it seems that overclocking is more difficult in 64bits. I can't reach the same values of overcloking that I reached when using the 32bits. I've tried the same settings in bios...different settings... but windows keeps crashing during boot even at 2,9ghz it became unstable. Nevertheless using my CPU at 2,8Ghz instead of the previous 3,1Ghz in 32bits it scored 7.2 in Windows experience index instead of the previous 6.4. How is that possible? Why is there a difference in overclocking between 32 and 64 bits system?

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impossible to overclock in windows seven 64bits...system is too unstable even with small overclocks....going back to old vista 32bits...

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Hi, I also have a phenom 9650 that I want to overclock. Have you had to change any of your voltage settings to achieve the numbers you have posted? And have you had any progress overclocking with win 7 64bit?

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Well, currently i'm using windows 7 64bits...well I prefer not to change the voltages....I can overclock this processor to 2,8 or even 2,9ghz but it's not stable. If i use a programs that requires more "work" from the CPU it crashes with the same message "A clock interrupt was not received on a secondary processor within the allocated time interval". So i've decided to wait a couple of months and then buy an AMD Phenom II X4 940 Black Edition. Being a black edition it will be much more easy and safe to overclock it. And it works at 3.0Ghz...

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