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Help Overclocking Athlon II x4 635

Last response: in Overclocking
October 14, 2010 1:12:15 AM

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?
a c 101 à CPUs
a b K Overclocking
October 14, 2010 12:15:57 PM

Did you lower the RAM multiplier, if not its most likely the RAM cannot handle the speed.

Best solution

a c 158 à CPUs
a c 280 K Overclocking
October 14, 2010 4:47:45 PM

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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October 14, 2010 7:07:46 PM

Ok, ill try slowing the ram down.

Would that counteract the benefits of increasing the CPU frequency?

Ill try it tonight. I would like the processor to run comfortably at 3.4 if possible.
October 14, 2010 7:08:53 PM

Also, I should mention, Ive tried increasing the bus/ht link speed in the bios, but for some reason it doesnt reflect when i boot up. It still shows that its running at stock speeds

a c 158 à CPUs
a c 280 K Overclocking
October 14, 2010 7:23:32 PM

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.
October 15, 2010 5:31:03 AM

Sweet. I followed your suggestions and all was well. 2hrs on prime 95 and all is stable.

October 15, 2010 5:32:36 AM

Also.. what a wicked processor. I picked it up for 99$ a couple months ago. I have never seen a 100$ processor go so far in terms of price/performance.
a c 158 à CPUs
a c 280 K Overclocking
October 15, 2010 5:40:32 AM

Well bro is the AMD price/performance. Enjoy it ;) 
October 15, 2010 12:01:55 PM

I should also add, the correct voltage is 1.41v, not the 1.37 as posted above. It was a little bit unstable @ the stock voltage.
October 25, 2010 5:28:18 PM

Best answer selected by docfeelgood.