Max Cpu voltage

[john826472]

Hello everyone i was curious about the contradictory facts on max safe cpu voltage. I have seen 1.5 volts on some forums and then 1.34 on others. Im building a desktop in about a week(give or take a day) and the cpu i am getting is an i7-7700k.

Max safe voltage for daily use?

 

 

Should i just reserve extreme overclocking for benchmarks? 

 

 

Do cpus have a maximum voltage as long as you keep them cool or does electronic degradation more strongly affect a cpu at high voltages even when kept cool?

 

If you have a fast proccessor(i7 7700k) do you really need to overclock for anything besides benchmarks?

 

If you can answer some of these questions that would be awesome 

Thanks!!!

 

[Lays]

under 1.4v with good cooling, ~1.3-ish or less with poor/average cooling (things like 212 evo)

 

With a delid + really good cooling, anything under ~1.45v should be aight.

[Mira Yurizaki]

My rule of thumb is no more than 10% of the operating voltage. After that, you risk killing the part because you can only drive a part so far before it just catastrophically fails.

 

I believe the mechanism was that in a gated FET, as you increase the voltage, you increase the current channel going across the transistor. At some point, it becomes so wide that it's basically like letting the dam burst.

[xentropa]

Asus boards only go up to 1.7.  Higher than that requires shorting the OVER VOLT jumper then it can go up to 2.1 I think.

[john826472]

1 minute ago, Lays said:

under 1.4v with good cooling, ~1.3-ish or less with poor/average cooling (things like 212 evo)

 

With a delid + really good cooling, anything under ~1.45v should be aight.

Really good cooling as in aio water cooling or 360mm rads 500$ cooling

[Ensho]

Like Lays said, you won't need more than 1.4v with a 7700k...but you will need a good AIO with that voltage.  For air, don't go higher than 1.35v as heat will be too high.  Yes, you can go as high as 1.5v,..but that is for extreme overclocking with really good cooling and it won't be necessary.  For daily use..for me, I find the lowest possible volts I can run.  Right now I am running at 4.5ghz @ 1.15v with a turbo loadline with zero issue for everyday use.

 

And yes, it is possible to give too much volts to a cpu.  As JayzTwoCents about his recent overclocking escapade.

[john826472]

1 minute ago, Ensho said:

Like Lays said, you won't need more than 1.4v with a 7700k...but you will need an AIO with that voltage.  For air, don't go higher than 1.35v as heat will be too high.  Yes, you can go as high as 1.5v,..but that is for extreme overclocking with really good cooling and it won't be necessary.

 

And yes, it is possible to give too much volts to a cpu.  As JayzTwoCents about his recent overclocking escapade.

Oh yea i remember that video 

[Ensho]

4 minutes ago, Aladd2040 said:

Oh yea i remember that video 

After lots of experimenting, I've found my 7700k does just fine at 4.5ghz with 1.15v.  Turbo loadline pushes it up to 1.176 at times, but keeps it from going below 1.15v during load.  I was running at 4.8ghz with a 4.5ghz uncore with 1.25v and turbo loadline, but even though temps were fine...they are even better now with the cpu never getting higher than 60c.

 

Just keep in mind...it is not always about finding the highest clocks.  It is fun to find them for short term bench marking, but for daily use....I personally like to run stock with the lowest possible voltage.

[Lays]

20 minutes ago, Aladd2040 said:

Really good cooling as in aio water cooling or 360mm rads 500$ cooling

AIO: 1.35-1.4v

Custom loop + Delid: 1.4v-1.45v

Air: 1.3-1.375v