tomr, Few questions are banal, if they have good intent, as your's does.
Question: What are you using to monitor the CPU's voltage? Depending upon what that is, you may not be getting a real reading, you might just be seeing the maximum value if you set that as such in the BIOS.
An FYI, the reason your CPU runs at 1.6GHz is more likely due to Intel's power saving features, those being Enhanced Intel Speed Step (EIST) and C-State technology. Both of those should be options in your BIOS, to enable/disable, and are likely defaulted to Enabled. When the CPU load is low, usually the CPU multiplier is reduced, and the frequency drops accordingly. As soon as demand is put on the CPU, the multiplier will switch back to it's usual value. C-State's results are similar to EIST, but their actions are more complex and have varying levels or "states" the CPU will be set to in order to save energy.
As you know, CPU temperature is the main thing that damages a CPU. Frankly, I can't say what exactly would happen if somehow a CPU could be kept at 30C with five volts applied to it, but I would think the extremely tiny transistors would be destroyed by the amount of current that would try to flow through them. I know that CPUs will throttle themselves down if they become to hot, but I don't know if they can control excessive voltages. Your voltage, while high, is not beyond what over clocking a CPU would require. Your question has me wondering too, is it simply high temperature that ruins a CPU, or can high voltage do that as well, independent of temperature. What we may all be calling "heat damage" might also include over-voltage damage.
While we can discuss a CPU as a single entity, it really is made up of multiple components, including the actual processing cores, cache memory, memory controller, and now, a GPU on the same die. So while one part might survive a higher voltage, another such as the Integrated Memory Controller, will not. Regardless, if one part expires, the CPU is destroyed.
I find it hard to believe your voltage is not changing, which is why I need to know what you are using to monitor it.
Hello Parsec, thank you for your respond. I use CPU-Z (frequency and voltage monitoring) and RealTemp (temperature monitoring). ASUS monitoring tool seems to me inacurate since it shows 10°C lower than RealTemp does (?)
Well, I am glad you are interested in the answer of my question as well :-) So, if anybody knows... May higher voltage ITSELF damage or reduce lifetime of CPU? And if yes, how?
+ if yes => is 1.345 V for 2500K too much?
Thank you for your answers!!
(I hope somebody from Intel may be helpfull very much in this matter since 2500K is you "baby" :-)
Ok, CPU-Z does update it's readings, so if you're at 1.345V constantly, then your BIOS must be set for manual selection of CPU voltage, and is set to 1.345V.
The problem with wondering if a certain voltage is dangerous is that these CPUs, and all CPUs for that matter, are much more complex devices than most people realize when considering power factors, and have all kinds of things happening that most of us don't understand, including myself. If you examine the technical documents for your CPU, you quickly see things are far more complex than a simple voltage value. If we can derive a maximum voltage from the Voltage Identification Definition table, that would be just over 1.5V.
Regardless, the technical documents do focus on the temperature of the CPU as the main factor to consider for keeping a CPU from being destroyed. Related to that, it is not simply the voltage applied to the CPU (within normal limits) but the actual power in Watts being used by the CPU, which involves the current draw.
I'm rambling here, since I am not comfortable answering your question about your voltage. Over-clocking and the higher, constant voltages required for it, are simply the risks that people doing this must deal with. If your mother boards BIOS has limits for the CPU voltage that are within a relatively safe range, then as long as your CPU cooling is adequate, you are probably fine. But as with anything operated beyond it's standard specs, it's longevity will be much more at risk.
Also understand that no one wants to tell you your voltage is fine, and then later your CPU burns out.