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Help Overclocking Athlon II x4 635

Last response: in Overclocking
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Hey folks,

I recently picked up an athlon 635 processor. I bought it with the hopes of getting a good overclock on it.

However, I cannot get it above 3.0ghz with out the computer shutting off.

This is my setup:

Asus M4A78-EM (780g/700sb)
3gb OCZ platinum ddr2 800 (2x 1gb, 2x 512)
Sapphire 4670 1gb
400w xion PSU
Win 7 home



I ve been using AMD overdrive to raise the bus speeds and increase voltage, but it hasnt worked out well.

How important are memory timings when over clocking? Also, the PSU is a cheap one, could that be the source?


The operating temps of the processor/board are far from overheating. The processor hits 45 degrees under load.

Any suggestions?

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CPUs Master
Overclocking Master

Hi docfeelgood and welcome to Tom's forum.

1- Don't use AMD overdriver to OC.
2- Always OC from the BIOS.
3- The 635 is a locked CPU that means that u can't change the multiplier CPU to rise or drop the speed of it in that case u need OC with the FSB (bus speed as u call it) but rising the FSB u also change the RAM speed because both are linked. The 1st thing that u need to do is slow down the RAM speed to 667 after that u can start to rise the FSB.

Don't forget test the stability of the rig with prim95 3 hours, OCCT 2 hours or LinX 1 hour because that u can boot or log in doesn't mean that the rig is stable.
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CPUs Master
Overclocking Master

HT link also rise with the FSB but the HT link can't be more that the NB frequency or u could have problems.

The recommended speed for the HT is 2000MHz.
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