What can cause OC failure?

[Conehead]

I was wondering what can be the causes of OC failure? Is it only when your system gets too hot (from a voltage increase)? Or can your system lock up due to the fact that some settings cause conflict with other components? I am asking this because I've been doing some overclocking and sometimes my system is unstable but my temperature sensors do not indicate any abnormal temperatures. Any idea of advice on this?

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[FUGGER]

limitations of the components that make up the machine.

The RAM, PCI, or AGP may have a low threshold for working beyond spec. this will cause OC to fail. Also not enough core voltage, mem voltage or IO voltage in extreme overclocking can cause a machine to fail.
Timing of components, your ram may work fine at cas 2 100FSB but might fail at cas 2 over 110FSB.

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[Conehead]

So, are you saying that in order to increase your FSB, you might also need to increase the core voltage of your cpu, or perhaps your vid card?? If so, do you know how big of a core voltage increase is necessary for an increase of 5 mhz or 10 mhz of the FSB?


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[Unolocogringo]

For that small of an increase on newer cpu's you should not have to increase voltages unless you have a weak power supply. Now your memory may need to be set at CAS3 instead of CAS2 if you dont have quality name brand memory.Crucial (micron), Corsair (Infinion), Kingston with Infinion chips etc.

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[Conehead]

All the memory in my computer is Crucial brand.

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[FUGGER]

You can overclock some without increasing the voltages, you will quickly find your limitations. most people change vcore in the bios if they have the option when they overclock significant amounts +20%. when breaching 133FSB often it is required to reduce the PCI/AGP/memory timing in bios, lowering the dividers will help you break 133FSB if your having a problem.

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[Conehead]

What is the AGP/PCI memory timing?

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[FUGGER]

Your PCI runs at 33Mhz and your AGP at 66Mhz, as you increase the FSB the PCI and AGP also increase. You can lock the AGP/PCI on a TH7-II at 33/66, but other motherboards that is not a option.

Your memory clock also increases with the FSB, you can back off your memory by changing a divider in bios from 400Mhz to 300Mhz. This might enable you to reach higher FSB speeds.


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