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Getting i5 2500K to 4GHZ

post #1 of 7
Thread Starter 
Hey guyz, I am sure that all of u are lucky for another threat like this one  But still, I hope that any kind person will help me….

I browsed this forum and find out many of guide for over clocking, but I still few questions.

For example here http://www.bit-tech.net/hardware/cpus/2011/01/07/how-to-overclock-the-intel-core-i5-2500k/4

Or here http://www.clunk.org.uk/forums/overclocking/39184-p67-sandy-bridge-overclocking-guide-beginners.html

Are quite detailed guide to achieve of sufficient CPU clock.

But, I am quite much more users than overclocker so my goal is to get with my i5 2500K and my mobo Gigabyte Z68X-UD3 to stable 4GHZ. I know mobo is not well for OC, but what I heard for achieve 4 GHZ it should be ok.

My goal is to get the easiest way to 4GHZ. So will be possible if I only improve CPU clock ratio from base 3200MHZ ( 32*100) to 40*100? And ofc improve a little bit Vcore if need.

In guide are first steps to improve CPU ratio (40*100 for example) but (like here http://www.clunk.org.uk/forums/overclocking/39184-p67-sandy-bridge-overclocking-guide-beginners.html ) is next steps to setup DRAM timing, so is it necessary? Coz what I only need is to get CPU on 4 GHZ….

And still I did not find any guide for exact mobo which I have 

So if u guyz can help me a little bit will be very nice….

Thank your in advance
post #2 of 7
You don't need to mess with your ram timings. The easiest method to achieve 4ghz on a 2500k is to use turbo boost and up BCLK multiplier to 40, and boot your computer up again.

next, run some tests like prime95 blend for a few hours to see if you get a x0124 or similar blue screen. if not, you're good! if so, up your vcore slightly and re-test until stable.
good luck

edit: even though you said your motherboard isn't the best for overclocking, 3.2 --> 4.0 isn't a huge overclock for a 2500k, so most motherboards can handle it.
Edited by KraziKarl - 10/18/11 at 8:23am
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post #3 of 7
Hey mate smile.gif I'd suggest to work with the turbo multiplier instead of the cpu ratio as Intel claim its best for maintaining the longevity of your cpu and also stability.

4ghz can be be achieved quite easily by simply increasing the turbo multiplier....as you start to get beyond 4.0ghz you will need to play around with the vcore.

http://hardforum.com/showthread.php?t=1578110

This link has some good advice from Intel.

And i wouldnt worry about ram timings until you start to reach the limit of your cpu.

Hope that helps
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post #4 of 7
First off welcome to OCN. If you would be kind enough to fill in your rig specifics under your profile it will help others help you in the future. OCing to 4.0 on a 2500k I am pretty sure you can leave everything stock and just change the multi to 40. It is what I did and and I am running the stock cooler for probably another month. You could dink around with the voltages and try and set them lower then what it runs at auto if you want or your board might require you to if the auto isn't stable
post #5 of 7
4GHz should be no problem for that processor. Just up the turbo core to 40 for a 4GHz overclock and test it with prime 95 or linx. Basically do exactly what Krazikarl said. Since it is not really an intensive overclock, the only thing you should have to do is up the vcore. No other bios settings will need to be messed with other than the obvious ones such as power saving features off, unless you want to use the offset mode. Good luck with your overclock. The more you overclock the more you learn. This is my third build where I have overclocked personally. The last 2 builds weren;t so good, but I am working on my best overclock yet. Take your time, and make it a learning experience. Watch out for the overclocking addiction as well. Something will inevitably tell you to try to push your processor further.
post #6 of 7
I have the z68xp-ud4, it was pretty easy for me to get it stable at 4.5GHz

for 4GHz you can probably use the turbo settings and not have to mess with the power saving/downclocking settings or the voltage settings

I'm not familiar with OCing this board that way, but heres gigabyte guides I used
[ame="http://www.youtube.com/watch?v=LlRvdbq_F-c"]http://www.youtube.com/watch?v=LlRvdbq_F-c[/ame]
, and another one I used


If you want it at 4GHz all the time without downclocking, 1st try this, look at 1m50s in the above video

use 40 X
and disable 'real time ratio changes....' and the 1 right below it

then disable disable C1E and EIST, and C3,C6

save and exit, restart, enter bios and check that the CPU is at 4GHz



if isn't stable in P95, theres only 2 THINGS you would have to adjust, the MSLL(multi-step load line) a.k.a. Load Line Calibration (LLC) and the CPU Vcore

go look at 4m22s
I know for me I just choose 1.35V for 4.5GHz, and tried LLC lvl 4----quoting myself
Quote:
ran 64-bit P95 in-place large FFT for 28min then had BSOD 124, HWmonitor listed idle CPU vcore as 1.36, and droped to 1.32 during P95

so then I used LLC lvl 5 and then
Quote:
using lvl 5 the CPU is now staying at 1.36V in P95

Edited by StarDestroyer - 10/18/11 at 9:07am
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post #7 of 7
Thread Starter 
big thanks to all of you....I guess that i will be able to make it smile.gif
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