voltages for i5 2500k overclock?

Akagi · 3 Sep 2011 at 21:37

hi, i need a hand with my first ever overclock (apart from a pentium 4 northwood on a motherboard with locked volts and mutiplier)

what voltages would be best for:

38x100
40x100
42x100
44x100
46x100
48x100

and

50x100?

thanks a lot people

buzzlightweight · 3 Sep 2011 at 21:59

you can achieve much higher clocks with less volts on an i5 2500k due to not having HT.

5ghz should be about 1.38v

prt · 3 Sep 2011 at 22:04

even on 2500k every cpu chip is different.
some do 5 ghz on 1.38 other need lots more.
Trial and error is the way to go

Rik1254 · 3 Sep 2011 at 22:05

I cant find how to turn off my auto voltage, but the best Ive done is 4.4 @1.288V and its stable.

Its all depending on the chip you have though, some can run at really low V out of the pack where some need abit more V to run.

Akagi · 3 Sep 2011 at 22:21

would 4.6 @ 1.32 work ok do you think?

and 4.2 @ 1.3? (playing it safe of course)

Keyser Soze · 3 Sep 2011 at 22:33

well mine just failed 4.6 @ 1.35

Its stable at 4.5 @ 1.32. It failed after 10 minutes 4.5 @ 1.3

So it does seem to differ from cpu to cpu, take a look in the "5ghz club" for some ideas on what sort of voltages people are using for big overclocks.

Some crazy clock speeds in there though

not to mention the unbelievably high voltages lol.

Some people are 4.7 stable at 1.35 give or take, so just trial and error thats part of the fun.

Akagi · 4 Sep 2011 at 01:16

Keyser Soze said:
Some people are 4.7 stable at 1.35 give or take, so just trial and error thats part of the fun.

Trial and error has always been fun on my pentium 4 rig for overclocks, but I would be worried about damaging my cpu in this build cos I'm a 'poor' student so if I fry the cpu, It would be more inconvenient than doing some overtime at work and picking up another one :l

Does engaging in 'trial and error' with cpu voltages have any significant impact on the chip's integrity, reliability or lifespan..? (Provided that I stay within reasonable boundries)

Justintime · 4 Sep 2011 at 02:47

If you stay under 1.4v, theres a consensus that you're within the safe limits. Every chip is different, it might do 5GHz at 1.35v or 4.5GHz at 1.38v, all down to luck.

koooowweeee · 4 Sep 2011 at 11:40

http://forums.overclockers.co.uk/showthread.php?t=18287345&highlight=startername_koooowweeee

take a look at that thread

as said each chip is different so you will not know what it can do till you try

Azarathal · 4 Sep 2011 at 12:08

My chip needs 1.33v for 4.4ghz, before I flashed the bios it needed 1.344v

buzzlightweight · 4 Sep 2011 at 12:17

Justintime said:
If you stay under 1.4v, theres a consensus that you're within the safe limits. Every chip is different, it might do 5GHz at 1.35v or 4.5GHz at 1.38v, all down to luck.

koooowweeee said:
http://forums.overclockers.co.uk/showthread.php?t=18287345&highlight=startername_koooowweeee

take a look at that thread

as said each chip is different so you will not know what it can do till you try

i agree with both of you take a look at koooowweeee's thread its very helpfull

Keyser Soze · 4 Sep 2011 at 12:33

acme15 said:
Trial and error has always been fun on my pentium 4 rig for overclocks, but I would be worried about damaging my cpu in this build cos I'm a 'poor' student (the money for this gaming computer was from my entire family as a sort of reward for my gcse results) so if I fry the cpu, It would be more inconvenient than doing some overtime at work and picking up another one :l

Does engaging in 'trial and error' with cpu voltages have any significant impact on the chip's integrity, reliability or lifespan..? (Provided that I stay within reasonable boundries)

Just remember that the built in turbo mode or whatever its called will up the voltage to 1.4 or somewhere near, so doing it manually will be no different, you will have a warranty too but if it worries you too much set a voltage your happy with, and get a multi that is stable at that voltage.

Akagi · 4 Sep 2011 at 13:16

Keyser Soze said:
Just remember that the built in turbo mode or whatever its called will up the voltage to 1.4 or somewhere near, so doing it manually will be no different, you will have a warranty too but if it worries you too much set a voltage your happy with, and get a multi that is stable at that voltage.

You have a good point about turbo mode.

Would I have to deactivate turbo mode in the bios if I am going to set a manual overclock?

Also doesent overclocking void the warranty?

Keyser Soze · 4 Sep 2011 at 13:52

I'm not sure about the warranty, I guess once you take it to manual and play with the voltages then the warranty is void assuming that they can tell that is what happened.

I havent read of a single one failing because of reasonable voltages, but i'm sure someone can point to some info.

It is your choice I guess, leave it on auto and just increase the multiplier to begin with if you want to do it that way.

Once you change the voltage manually it will disable the auto.

Do a search for an overclocking guide for your board, there will be a guide somewhere which shows which are the best settings, also have c1e and eist activated to save some power when the pc is idle.

ukbilleh · 4 Sep 2011 at 16:43

In prime for me to run at 4.7 I have to be sat at 1.4v. I might be able to drop it a little lower but haven't looked into it too much. What I have noticed is that the power needs to be stable more than anything. I fluctuate about 0.08 -+ from 1.4v and everything is ok with LLC and SS on. As soon as these are off and I apply the 1.4v prime will crash as the vcore starts to fluctuate all over the place.