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Max Vcore for Venice? - Page 3

post #21 of 45
Quote:
Originally Posted by Compfreak
since i have rilly good temps would i be able to raise my vcore up to letss say 1.78V? i idle at 26C and full load of 42-44C

You have watercooling so that will give you a little more headroom. Still, I wouldn't go above 1.8V
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post #22 of 45
so 1.78V would be fine?
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post #23 of 45
Quote:
Originally Posted by Compfreak
so 1.78V would be fine?
I would not go over 1.75V but I think its fine.
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post #24 of 45
There is a difference of 50C on a non-overclocked CPU and 50C on a heavily overclocked CPU even when the temperatures are not extensively high. If you take into account transitory and electrostatic migration levels on the 55C non-overclocked CPU and on a heavily overclocked CPU you would see what I mean. The difference is marked and is one of the reasons why so many overclockers wish to stay much lower than the Processor Stock Thermal SPec rating.

There is a condition called "Threshold Voltage" which is the amount of power necessary to turn on and switch the transistors gates.

There is a formula for the switching power:

Power ~ ½ CV ² Af

This formula states that dissipated power is linear with the effective capacitance, activity and frequency. Power increases quadratically with the CPU's core voltage.

Thus when you overclock you are increasing the necessary voltage non-linear but on an exponential curve and thus it is also very necessary for a strongly functioning power to supply the overclocking needs.

There is more to overclocking than voltage and heat dissipation of the CPU.

R
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post #25 of 45
Quote:
Originally Posted by Ropey
There is a difference of 50C on a non-overclocked CPU and 50C on a heavily overclocked CPU even when the temperatures are not extensively high. If you take into account transitory and electrostatic migration levels on the 55C non-overclocked CPU and on a heavily overclocked CPU you would see what I mean. The difference is marked and is one of the reasons why so many overclockers wish to stay much lower than the Processor Stock Thermal SPec rating.

There is a condition called "Threshold Voltage" which is the amount of power necessary to turn on and switch the transistors gates.

There is a formula for the switching power:

Power ~ ½ CV ² Af

This formula states that dissipated power is linear with the effective capacitance, activity and frequency. Power increases quadratically with the CPU's core voltage.

Thus when you overclock you are increasing the necessary voltage non-linear but on an exponential curve and thus it is also very necessary for a strongly functioning power to supply the overclocking needs.

There is more to overclocking than voltage and heat dissipation of the CPU.

R

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post #26 of 45
Quote:
Originally Posted by Compfreak
Basically, this means that there are other events taking place when one overclocks the voltage of the cpu. Events other than heat that effect a processors ability, stability and health I mean. It is good to remember that the Processor SPec. thermal envelope (how hot the company says you should take the processor) is based on a non-overclock (voltage raised) processor.

That is why it is good to listen to the majority of overclockers who advise certain limits rather than listen to the few who advise heavy raising of values. That is unless you are not so caring of your hardware. If you are only concerned with short-term usage then it really doesn't matter.

R
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post #27 of 45
how long is short term?im upgrading in around 2months
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post #28 of 45
well im running 1.75v through my 3200 Venice....and im on air...mind you it is a BT nicely lapped and as5 used...idle at 30..load at 40...and yea i know that much voltage will hurt my cpu's life..but by the time it dies ill probably have another cpu....infact im getting a 3700 sandy in a few months....also your on water cooling so i think you should be able to take it to 1.75v.
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post #29 of 45
Quote:
Originally Posted by Compfreak
how long is short term?im upgrading in around 2months
A processor that is not overclocked usually has a life expectancy of ~8 - 10 years. This is averaged though.

It depends. There are no hard and fast answers. It depends on your CPU, how badly you kick it around, etc. Often the processor dies not die quickly, it just degenerates. It creates more errata which necessitate the OS ECC correction and this slows the system down. It begins to reboot more often when errata can not be corrected through the OS ECC and a STOP Hardware event is issued. Sometimes it just outright dies. Often when it is not treated too badly it will last for years without problems.

I have never had to pump more than 1.55V through a Venice to get 2.6V. Some need 1.6V though and a few 1.65. You can listen to someone who pumps 1.75V and try it also if you wish. I think you will find the HUGE majority do NOT though and there is a reason. For a couple of months it doesn't really matter at all. Are you going to sell it to someone after pumping 1.75V through it?

The reason I post this is that so others who do care about the life of their processor have more relevent material before they make informed choices rather than just reading that it is fine to drive 1.75 volts on air through a Venice.

What watercooling are you using? Some watercooling such as the BigWater does not really do much to bring a downward resistance to the effects I mentioned.

R
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post #30 of 45
Quote:
I have never had to pump more than 1.55V through a Venice to get 2.6V. Some need 1.6V though and a few 1.65. You can listen to someone who pumps 1.75V and try it also if you wish. I think you will find the HUGE majority do NOT though and there is a reason. For a couple of months it doesn't really matter at all. Are you going to sell it to someone after pumping 1.75V through it?
Nahh ropey im not going to sell it....this is more of an experimental rig...i want to see how long my cpu last for at this voltage...and well i got the 3200 for very cheap really so it wont be much of a loss....but yea i want to see how long it last... my pc is on 24/7 and not even a slight hickup yet...so time will tell
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