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What is the relationship of Core Temp to Overclock Speed

post #1 of 6
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For a quad core, air may be 55-60C, water 45C, TEC maybe -5C, and Phase maybe -20C?

How do the lower temperature improve overclocking? When I see them they look a bit similar: 330K, 315K, 270K, 250K.

Does overclocking potential with increased cooling require increased voltage? Does it require motherboards that support increased voltage while maintaining clean power? Do they require CPUs than take high power?

Or does the cooling work at any voltage strength?

Thanks,

David
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post #2 of 6
The temperature doesn't directly affect how high you can overclock the CPU. The idea is, the cooler the CPU runs, the more you can raise the voltage needed to support the higher frequency. And yes, the motherboard would need to be able to support running the voltage that high (some motherboards have trouble beyond a certain voltage). And sometimes CPU's are more voltage limited than temperature limited, the new 45nm CPU's just won't function correctly if ran above a certain voltage, no matter what the temps are.
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post #3 of 6
Quote:
Originally Posted by DavidNJ View Post
For a quad core, air may be 55-60C, water 45C, TEC maybe -5C, and Phase maybe -20C?

How do the lower temperature improve overclocking? When I see them they look a bit similar: 330K, 315K, 270K, 250K.

Does overclocking potential with increased cooling require increased voltage? Does it require motherboards that support increased voltage while maintaining clean power? Do they require CPUs than take high power?

Or does the cooling work at any voltage strength?

Thanks,

David
Well, generally, the cooling is so you can run higher voltages and OC higher. Now, some CPU's like lower temps and such, so there is a little truth to the fact that you can acheive higher overclocks at stock voltage by just lowering the temp. (especially with some GFX card cores)

The real point of extreme cooling is to counter the effects of high voltages and the heat they produce. Up until the new 45nm tech, heat was the major enemy of CPU's. It is true that higher voltage would shorten the life of a CPU, but in the overclocking world, that usually isn't a factor. (Who care if it dies in 2 years instead of 3, you'll most likely have a new CPU by then.)

With the newer tech, voltage is killing CPU's before heat becomes a factor. As the dies continue to shrink, they become more vulnerable and can't take the voltages we have been used to delivering to 65nm and 90nm CPU's. This, in turn, is starting to make extreme cooling obsolete. Since there is no way (that I know of, anyways) to protect against the effects of voltage itself, this is going to be an intersting time in the overclocking world.
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post #4 of 6
all that has been said is very true. its kind of like a formula. the lower the temps are the better the overclock casue you can up the voltage. i dont know about the new 45nm cpu's but on my e2180 i could easily reach 3.4GHz just by upping the voltage to 1.5v.

now for any normal person that it person that might be considered a suicide runa and my cpu might only run for about 3 years instead of 5 but that for me was alright. i got a new one within a few months of the old one.

to raise the voltage your going to need a good motherboard. in the UK a good motherboard starting price is about £70 thats about $145. but then agian we get really good results when we splash out. but their are a lot of other factors involved. Power is one of them so a good PSU id a must.

Cooling is a must. a CPU runs better when cooled efficiently. On youtube people show what happens when you dont have a heatsink. the cpu's litrally catch fire and blow. thats why when running high voltages you need a good cooler or when running very high voltages get water cooling.

Voltage is a major part of overclocking. if done incorrectly it can either make your cpu system. the overheating part is faught by the cooleoverheat and burn, not start at all (insufficient power) or give you a kick ass stable r.
    
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post #5 of 6
read my faq about temps - link below in my signature.
    
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post #6 of 6
Thread Starter 
Ok...I also understood it causes less resistance and therefore less heat generation. However, in the range we are operating...from 293K ambient to 355K frying core, does it make a difference over the range from an excellent water cooled system to a good one, say 10K or 5K? Or do you need TECs, phase change, or liquid nitrogen to cause 40-100K changes to see the effect?
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Overclock.net › Forums › Cooling › Specialized Cooling › Peltiers / TEC › What is the relationship of Core Temp to Overclock Speed