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When to up NB voltage

post #1 of 7
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Just started to OC my system and noticed that in the BIOS that there is an option to adjust the voltage to the northbridge. It is set at 1.6V at the moment. When and why would it be neccessary to up that? Could that be the reason that I'm maxing out at 200mhz for the fsb?
    
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post #2 of 7
It's a guessing game most of the time. Every motherboard is different. Mine can do up to 270MHz with 1.6V. Anything beyond that and I have to increase the voltage to 1.7. You just have to test every time and see what is stable.
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post #3 of 7
The reason for maxing out at 200MHz could be your ram as it's DDR400.
Have you tried slightly increasing ram voltage and/or relaxing ram timings ?
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post #4 of 7
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I've kept a divider on the ram to keep it under 200mhz. I'll try to bump the ram up to 2.7 to see what happens. How do I adjust the timings? I'm a bit confused as to which numbers to change. Do I just change one number and then test that out? If so, aren't there thousands of different combinations?

Thanks!
    
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post #5 of 7
Here is a good FAQ on timmings:
http://www.overclock.net/faqs/26706-...s-dummies.html

and on overcloking:
http://www.overclock.net/faqs/31782-...limits-my.html

When overclocking loosen up your timmings to around 2.5-3-3-7. You should have an option in your motherboard BIOS to change them.
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post #6 of 7
If your ram has run at 200mhz before or if thats what its rated at then the timings are prob ok since your running it under what its rated for... your on the right track here.. Ya gotta determen whats keepin ya down at 200mhz. If you have the ram turned down it shouldnt be that... so now its the CPU or Mobo most likely... If you cant boot try a little more vcore... still not working they yes now its time to up the chipset voltage
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post #7 of 7
2 things.
1. What are the default RAM timings? Don't know , get CPU-Z, it will tell you in the SPD TAB.
2. What PS do you have? It may not be able to provide enough stable power.
Check the sticker for "watt" and 12+v for the "a" or amperage rating. it there are more than 2 12+v listed add them up for the total.
    
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