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OCing i5 2500k

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June 11, 2012 6:21:53 AM

Hi I was reading in another thread for ocing the 2500 to 4.0 ghz to start at 1.3v and adjust upward for stability. Now, I am a noob to all this and would like to know what "stable" is and how I know it is operating stable. Cooling isn't an option. Thanks

More about : ocing 2500k

a c 184 à CPUs
June 11, 2012 6:35:34 AM

More information.
June 11, 2012 6:41:27 AM

....Like? All I am asking is how to know when my cpu is operating stable?
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a c 184 à CPUs
June 11, 2012 6:42:47 AM

Stable? If you are using right now, it's stable.
June 11, 2012 6:50:39 AM

Lol okay, so unstable means that the cpu won't start up windows and just crash after I change the settings in the bios?
a c 184 à CPUs
June 11, 2012 6:51:31 AM

xnocturnal said:
Lol okay, so unstable means that the cpu won't start up windows and just crash after I change the settings in the bios?

Unstable can mean a lot of things, I take unstable as failing a CPU stress test!
June 11, 2012 7:01:23 AM

Okay, what would be a good cpu stress test to download?
a c 184 à CPUs
June 11, 2012 7:02:20 AM

Intel Burn In.
June 11, 2012 7:09:50 AM

Intel burn test or cpu burn in? And should I even adjust the voltage levels? Or just the multiplier set to 40x100?
a c 184 à CPUs
June 11, 2012 7:12:50 AM

All trial and error.
June 11, 2012 7:21:43 AM

xnocturnal said:
Intel burn test or cpu burn in? And should I even adjust the voltage levels? Or just the multiplier set to 40x100?


It really depend on your individual CPU, Motherboard and CPU cooling. In my case at 4Ghz, it did not require more Voltage. At x40 i only set the Intel Turbo Multiplier for all cores.

At 4.5 it needed a slight increase.

I use prime 95 to stress test CPU. There is a very good thread under OC in the forum you should look at, Its a Sticky thread.

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a b à CPUs
June 11, 2012 7:24:48 AM
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First off just like any overclocking you will need to enter the bios. Depending on your motherboard I always recommend going to the Save/Exit section and select restore to Defaults just in case some settings were changed if you were adjusting things so we can start fresh.One thing that I always recommend is disabling all the things you are not using such as eSata, USB 3.0 etc. After that depending on your motherboard you should have an Overclocking section so we need to go here next.

First go ahead and set your CPU Multiplier between 40 and 45 Since the Baseclock on most P67 motherboards should be 100mhz, 100mhz x 40=4ghz etc. This is the option that we will use because Sandy Bridge is very testy when it comes to adjusting the Baseclock.

Next go to VDroop and change this to without Vdroop. This will basically help reduce sagging while we run Prime95 or Linx and keep the voltage stable.

Next go to Internal PLL Voltage Override and set this to Enable- This is a very important step whenever you are using a multiplier of 40 and greater.

Next go to CPU VCore and set this to manual and then I would recommend starting at 1.300V for 4ghz and if you want 4.5 you will more than likely need about 1.325 but always remember to test in small increments in order to achieve a nice stable overclock. This may vary on your CPU whether or not you have the same identical one as someone else.Now we need to configure some other very important features in our Bios which some are completely optional but I would highly recommend changing them for stability.

First go to EIST (Intel Speedstep Technology)and disable this feature. Basically this allows your CPU to throttle down below even the stock 3.4ghz when tasks are at a minimum so it is optional but I always disable it.

Next got to C1E Support and disable this feature. This is another power saving feature but enabling this might cause instability.

Next go to CPU C3 Support and set this to disable. I believe this is also called Sleep where the processor does not need to keep its cache coherent but maintains another state.

Next make sure you have Turbo Mode enabled. Most P67 -Z68 motherboards have this feature.
Next up, memory settings! Make sure to configure this per your memory specifications, or use the XMP function to use the built in SPD settings (if applicable)Now you can go ahead and Save/Exit to Windows. I would definitely recommend having some Temperature software previously installed on your system. I swear by Coretemp but there are many others out there. Make sure you keep a close eye on your temps after booting into windows.

Now that you are in windows check you clock settings with CPUZ and I recommend running a stability test such as Prime95. Another great one is LinX which is very intense. You can run it as long as you want and there are many different opinions as to how long you should run the tests to do some research online and make your decision.

That is basically it for now so if you have any questions feel free to ask me and I will be able to help you to the best of my ability.

a b à CPUs
June 11, 2012 7:29:11 AM

"A word of Caution:", i am just giving you basic idea you really need to study and understand overclocking and how it works before you go knee deep in imo.there allot of risk involved and it's up to you to decide if it's worth it.
June 11, 2012 7:30:30 AM

Best answer selected by xnocturnal.
June 11, 2012 7:31:03 AM

Okay thanks ill give it a try and get back!
a b à CPUs
June 11, 2012 7:58:44 AM
a b à CPUs
June 11, 2012 7:59:25 AM

xnocturnal said:
Okay thanks ill give it a try and get back!
No problem!Your very welcome! ;) 
a b à CPUs
June 11, 2012 9:28:46 AM

Also./ make sure you have a good heat sink you better not try overclocking on stock cooler lol you'll be sorry if you do trust me.
June 11, 2012 5:01:58 PM

Lol I know. I'm a veteran with hardware, just not OCing. I've got the new thermaltake Frio, keeps my i5 2500 at 23 c, idle, ill try the OC sometime soon this week when I'm not tied up with work and playin BF3
a b à CPUs
June 11, 2012 5:16:22 PM

xnocturnal said:
Lol I know. I'm a veteran with hardware, just not OCing. I've got the new thermaltake Frio, keeps my i5 2500 at 23 c, idle, ill try the OC sometime soon this week when I'm not tied up with work and playin BF3
o.k. sounds good wasn't meant to insult you just i would feel horrible if you didn't know that and i didn't mention it and you fry your rig
June 11, 2012 5:26:16 PM

No big deal cyco, thanks for the help!
June 11, 2012 5:29:38 PM

And as for amuffin, sounds and looks like you hate life. Cheer up and everything around you gets better. Thanks for the negative replies
a b à CPUs
June 11, 2012 5:39:59 PM

xnocturnal said:
No big deal cyco, thanks for the help!
Anytime...Your welcome! ;) 
!