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i5 2500k - up to 5ghz !

post #1 of 6
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Currently I'm stably working at 4,8GHz. Temps during OCCT tests don't go over 80c. The vcore voltage is set fixed as 1,39V, but it actually very often goes up to 1,4V.
I've got an air cooling: silentiumpc fortis, it's rather "middle-end".

Is it possible to reach 5GHz? Just to take the screenshot biggrin.gif

How should I set vcore if I wanna do that?

Do I set anything else other than vcore voltage/multiplier?
post #2 of 6
If you want to hit 5GHz you will need better cooling but other than that it will be possible. I'm at 4.8GHz @ 1.38V with my 2500K but if I want to go any further than that I have to bump up the voltage quite a bit. Last time I tried to hit 5GHz I had to run at 1.44V which is a voltage that your cooler will struggle with. All you need is voltage/multiplier and you will need to tweak the LLC a bit.
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post #3 of 6
Hey man
Fill out your rig on signature, and visit this awesome thread for a detailed guide http://www.overclock.net/t/1198504/complete-overclocking-guide-sandy-bridge-ivy-bridge-asrock-edition
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post #4 of 6
I use my 2500k at 4.8 with all power saving features and offset voltage but I would guess you are going to have to get up to 1.45v at least to get to 5ghz. I also don't think there is a guarantee you an get to x50 multi.

good luck trying!
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post #5 of 6
It bumping up voltage even if you have fixed volts means you have Overvoltage on or LLC very high/extreme.

You can find out if it's a cooler issue by disabling 2 cores, see

http://hwbot.org/forum/showpost.php?p=95113&postcount=117
Quote:
Binning Sandy Bridge is extremely easy.

- use HS fan with easy mounting
- set Vcore to 1.55V
- disable HT and 2 cores (to not make it overheat with crappy HSF)
- increase multiplier

You just need to see the windows OS options, not actually boot into windows. If your CPU can show the different OS options, stability will just be function of Vcore and temperature. If it doesn't show the OS options, you will never get it stable anyways, so you might as well ditch the CPU.

Usually, it takes about 5 minutes to see if the CPU is good or not.

With some CPUs, you do have the issue that some multiplier is better than the other for stability. For instance, my current CPU can boot at 51x MAX (~ 5145MHz). When trying to run near this max speed, I have to use 49x instead of 50x multiplier because it's a lot more stable.

But, that's something you don't need to test. With BCLK adjustments, you'll never get 5200MHz going or so. Multiplier binning is the best way.

Edited by AlphaC - 3/28/13 at 11:26am
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post #6 of 6
Quote:
Originally Posted by khernik2 View Post

Currently I'm stably working at 4,8GHz. Temps during OCCT tests don't go over 80c. The vcore voltage is set fixed as 1,39V, but it actually very often goes up to 1,4V.
I've got an air cooling: silentiumpc fortis, it's rather "middle-end".

Is it possible to reach 5GHz? Just to take the screenshot biggrin.gif

How should I set vcore if I wanna do that?

Do I set anything else other than vcore voltage/multiplier?

so you just want to hit 5GHz, boot into windows and validate with CPU-z?

yes that is possible by just raising the vcore upto around 1.48 - 1.5V and the multi to x50. voltages are an estimate and may vary for your chip. also you could try upto 1.55 and you might hit something like 5.2GHz and be able to boot and validate.

also yes, set LLC and anable PLL overvoltage as AlphaC sugested
Edited by stubass - 3/28/13 at 11:30am
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