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Thread: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

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    Default 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    Tonight I had some time tonight so I decided to play around with higher OC. I know the 2500k doesn't need water to get high OC, But I have mine under water and full loop with 2 x GPU. All Fans are set to the lowest setting to make this a quiet system. I can't even really hear the system on. This is with my LanPC which is running the 2500K+ASRock Z68 Extreme 4 with 2 XFX 6870 with Koolance blocks.

    Thanks Jim for your help.

    Here are my Results.
    2500k @ 4.4ghz at Vcore set at 1.350, for some reason core temps shows the core correct but on CPU it shows just slightly lower/higher it jumps around.. Not sure why. But in the bios its set at 1.350.
    Here some Screen shots. Ran Prime for over 3 hrs and no error. Perfectly stable for 24/7 use. I would go higher but its not need for my 24/7 use.

    Prime 95 Test

    By solara2xb at 2012-06-11



    By solara2xb at 2012-06-11

    Then Intel Burn in

    By solara2xb at 2012-06-11
    For some reason I had Temp spikes with Intel Burn in but not Prime... Over all Avg temps I maintain was just under 60c with minor 1 sec spikes here and there..

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    Default Re: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    You will easily get 4.6GHz with that chip

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    Default Re: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    Nice job kenny. Post some pics of that rig.
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    Default Re: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    that voltage is pretty high just to reach 4.3ghz mine will drop to 1.26-1.28v while testing, looking at your temps ..that's watercooled?
    IBT wil put more stress on the CPU then Prime, its prolly the most stressful form of testing on the CPU.

    Last edited by PC_User; 12-06-2012 at 09:19.

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    Default Re: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    nice
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    Default Re: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    Verry nice.

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    Default Re: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    Thanks everyone!

    Quote Originally Posted by SamCR3 View Post
    Nice job kenny. Post some pics of that rig.
    Hey Sam, This is the same rig I did the Corsair 500R review.

    Quote Originally Posted by PC_User View Post
    that voltage is pretty high just to reach 4.3ghz mine will drop to 1.26-1.28v while testing, looking at your temps ..that's watercooled?
    IBT wil put more stress on the CPU then Prime, its prolly the most stressful form of testing on the CPU.

    Do you have your Voltage on Auto??? I tried doing that and system was unstable. I had to put at least 1.35v to get it stable at 4.4. Temps did seem kind of high to me, but considering that I also have 2 6870 in the same loop at the CPU with only a EX240 Rad they are ok. Ambient was at about 27c at the time I was stress testing.. When I have some more time I might try to push it a little higher.. But I really don't want to temps to go any higher then what I have. I don't want to have to turn the fans up. My goal was to get a quiet rig with a decent OC...

    I also noticed that your IBT was tested on normal. I had mine tested on High. That might make a little temp diff.

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    Default Re: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    nice i wish i could OC up there

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    Default Re: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    No my voltages are set in the bios to 1.30v I reran the IBT on high and it went up 3deg C, ambient is about 28c I didn't think about your GPUs being cooled that makes a big difference. I do understand the noise I wish I could quite my GPUs as that's all I hear in my case.

    you can set your bus to 100.8 on your memory and try to lower your PLL/offsets which may help also help reduce temps and voltage, and disable LLC since generally its not needed until 4.7ghz

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    Default Re: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    Kenny, stop using HW monitor and use core temps in your screenies.

    Norm, LLC is needed. When disabling you will have to use more volatge that necessary to compensate for Vdroop. 2500K's run much cooler than 2600K's. If he is using a 120.3 rad the GPU's will not make much of a difference for temps.

    You guys. Voltage can easily go up to 1.44V safely as long as your loaded temps are under 75.

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    Default Re: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    By the way, a mere 3 hours of Prime 95 does not demonstrate stability. To have reasonable confidence in an overclock, first do a couple sets of IBT or LinX with 20 passes each. Then the rule of thumb is to run Prime 95 for at least 8 hours with no "workers" stopping.


    IBT/LinX is done first because it is a means of finding significant instability relatively quickly. Whereas Prime 95 checks long-haul stability; it is fairly common for Prime 95 to initially fail testing in the 5 to 6 hour timeframe, which indicates further tuning of an overclock is needed, and would otherwise never be discovered by shorter 3 hour test runs.

    Of course, if you are willing to settle for sort-of-stable, then don't bother with the extra testing I described above ... but then realize if your system crashes later on during intensive gaming/workload it will likely be because the overclock was never properly fine-tuned.

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    Default Re: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    Hey Jim, I do have Core Temp in my SS, I just have HW open also just to compare. Sometimes I will use Real Temp as well but I always base my temps off of Core Temp.
    If I was using a 120.3 rad I think I will have better temps. But since I am using a 120.2 my temps are going to be a little higher since I have 3 blocks in the loop. I might play around with some settings tonight to see if I can bring the system up to 4.6 or even 4.8ghz and keep temps under 65c. In my area lately the temps even in the evening have been about 26-30c ambient, signs of summer being right around the corner.

    Last night during I ran IBT in normal and my temps were almost 5 degrees cooler. Ill try to use the bus speed at 100.8 and see what happens. But at the current settings I haven't had any issues. Stability and Silent PC is my goal. I tried to run Prime with my Voltage at 1.32 before I uped it to 1.35 and it was unstable. I guess each chip is diff. I needed a little more Voltage to get it stable.

    I have a feeling at 4.6 and 4.8 I will need to up the voltage a little more. Ill play around with his and post some Screen shots when I have a chance.

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    Default Re: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    forget 100.8 on BLCK. Keep it at 100. The .8 will not mean much and 100 will insure stability.

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    Default Re: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    Quote Originally Posted by ZeroChill View Post
    By the way, a mere 3 hours of Prime 95 does not demonstrate stability. To have reasonable confidence in an overclock, first do a couple sets of IBT or LinX with 20 passes each. Then the rule of thumb is to run Prime 95 for at least 8 hours with no "workers" stopping.


    IBT/LinX is done first because it is a means of finding significant instability relatively quickly. Whereas Prime 95 checks long-haul stability; it is fairly common for Prime 95 to initially fail testing in the 5 to 6 hour timeframe, which indicates further tuning of an overclock is needed, and would otherwise never be discovered by shorter 3 hour test runs.

    Of course, if you are willing to settle for sort-of-stable, then don't bother with the extra testing I described above ... but then realize if your system crashes later on during intensive gaming/workload it will likely be because the overclock was never properly fine-tuned.
    Heya Zero. 3 hrs is good for Prime95. I have never had a crash after a 3 hr run with prime95. At 2.5Hrs, prime95 is pretty heavily stressed. Stable is defined differently by everone and a 4 day stress does not mean everything is stable anyhow. 3 hr at prime should be enough where every day computing will not crash.

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    Default Re: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    I and many others will disagree with you very strongly. Three hours is meaningless. Even the Prime 95 folks recommend greater than 6 hours and suggest 8+. I personally have experienced Prime 95 failures all along the 3 to 7 hour range during my initial testing. When I finished fine-tuning my system it ran (and continues to run) for a full 24 hours without workers stopping. It is all a matter of how much time and effort you want to put into achieving a solid overclock. To put it simply, you get what you pay for.

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    Default Re: 24/7 4.4Ghz OC stable i5 2500k with Asrock Z68 Extreme 4

    Quote Originally Posted by ZeroChill View Post
    By the way, a mere 3 hours of Prime 95 does not demonstrate stability. To have reasonable confidence in an overclock, first do a couple sets of IBT or LinX with 20 passes each. Then the rule of thumb is to run Prime 95 for at least 8 hours with no "workers" stopping.


    IBT/LinX is done first because it is a means of finding significant instability relatively quickly. Whereas Prime 95 checks long-haul stability; it is fairly common for Prime 95 to initially fail testing in the 5 to 6 hour timeframe, which indicates further tuning of an overclock is needed, and would otherwise never be discovered by shorter 3 hour test runs.

    Of course, if you are willing to settle for sort-of-stable, then don't bother with the extra testing I described above ... but then realize if your system crashes later on during intensive gaming/workload it will likely be because the overclock was never properly fine-tuned.
    Hi. Thanks for your reply. I understand where you are coming from. In the past I have ran prime overnight to check for stability, In this case I didn't have that much time so I can the best test I can. usually 2.5 hours into prime you will find out stability will become a issues. at 2.5 hrs is when prime starts to put more stress on the MB VRMS which in most cases will cause Vdroop and stability becomes an issues. Now that is from my experiences in the past. Tonight when I am going to try to change some settings to get a little higher clock and do a longer stress test. Ill post my results once available.

    I've never ran Linx before, I may look into this program tonight. Ill also run a 20 pass IBT tonight at my current settings and see if stability is a issue. I think at 4.6 I may be able to get temps to not exceed 65c which is now my new goal. My fans are set at 800 rpms in pull configuration right now with the single EX240 with 2 GPUs in the loop.

    Thanks again for your input.

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