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Need help troubleshooting some O/C issues.

post #1 of 14
Thread Starter 
Hello guys, long time lurker here.

Never bothered to register prior to this, but I am afraid that I would like some help regarding a new system that I have been building. Basically, I want to make sure that I have been doing everything correctly (been following the guides, using forum search, yada yada) and I had a few questions.

The system that I've built is also listed in my signature area, however in short, it's a i5 2500k overclocked to 4.5 GHz. I don't often see Zalman being mentioned here anymore, however that is indeed what I am using for a CPU cooler, specifically the 9700 NT using Arctic Silver thermal compound (I've recently read here that other products have surpassed AS5's quality and I am interested in trying them out soon).

I also have a Xiggy Dark Knight CPU cooler lying around not being used with an additional 1155 socket type bracket set but I couldn't figure out how to install it and got pissed off and I've relied on Zalman with previous installations yielding positive results, so I just went with that. It has been a great CPU cooler so far.

The CPU-Z validation page for this can be found here. When I run Intel Burn Test, it is not found to be stable using the standard stress level. It is stable on 4.4 GHz (which I am happy with, just wanted to see how far I could go out of curiosity and personal interest).

Probably one of my bigger concerns has to do with voltage. CPU-Z says that the core voltage is running at 1.296V, so I'd imagine that I could increase that to 1.35V or perhaps a little less and still be able to achieve 4.5 GHz with no stability issues?

Another one of my concerns is that in the aforementioned CPU-Z validation webpage, my RAM speed is being listed as "RAM Speed : 802.4 MHz (1:6) @ 9-9-9-28" however upon POST, it is clearly running at a memory frequency of 1600. Am I missing something here? I obviously don't want to be running at 800 Mhz when I can run at a much faster speed than that. Should I be trying to run at 8-8-8-24 here?

Essentially, I am looking for additional guidance on my system build and would appreciate seasoned opinions and expertise.

Here's a photo of my system so far:


Thanks, OCN!
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The Quadfather
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post #2 of 14
set your voltage manually...if it doesnt run stable on 4.5ghz....try feeding it a little more...also...those memory sticks are what they should be....rated speeds always appear x2....so 1600mhz will appear 800mhz in cpu-z since it's double data rate(hence ddr)....but do try going for tighter timings since this will improve it's performance
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Maxim
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post #3 of 14
Thread Starter 
Thanks for the comment, Daryl, I appreciate it.

Here's a screenshot of the Intel Burn Test that I just ran @ 4.4 GHz with 1.35V VCC core voltage.


I am not exactly sure just yet how to read the Linpack Output section. Is what is listed in Speed/GFlops pretty good results?

Also, what would be an acceptable timing that I should aim for regarding my RAM? 8-8-8-24 sound good? I'll try this and report back.
Edited by Qubits - 7/27/11 at 11:30pm
The Quadfather
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The Quadfather
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post #4 of 14
You can always check the RAM manufacturer for safe timings.

My stable 4.5G is at 1.368v - pretty nasty I think.
StrykeR
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StrykeR
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post #5 of 14
Lower the voltage is always better.
If you can make it stable at 1.35, then go down from there till you get BSOD.
Then up a vcore one notch. That is your stable vcore.
Also testing only 1024 RAM in IBT isn't enough.
Test all RAM. (It needs more vcore/VTT(VCCIO) to run every RAM compared to just running 1024)
Also run Prime95 for 10+ hours.
The combination of those two stress tests will most likely ensure your system stability.
i5 2500K GTX570HD
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i5 2500K GTX570HD
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post #6 of 14
Thread Starter 
Quote:
Originally Posted by Tunagoblin View Post
Lower the voltage is always better.
If you can make it stable at 1.35, then go down from there till you get BSOD.
Then up a vcore one notch. That is your stable vcore.
Also testing only 1024 RAM in IBT isn't enough.
Test all RAM. (It needs more vcore/VTT(VCCIO) to run every RAM compared to just running 1024)
Also run Prime95 for 10+ hours.
The combination of those two stress tests will most likely ensure your system stability.
It's not stable with a vcore of 1.35V @ 4.4 GHz. Any other tips? I really want to run an overclock of 4.4 GHz with no stability issues but obviously I don't want to fry my processor in the process.
The Quadfather
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The Quadfather
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post #7 of 14
Thread Starter 
Adjusted the CPU vcore to 1.36V @ 4.4 GHz with Load Line Calibration disabled (went with the Anandtech opinion on this). Seems to be stable according to a quick five passes with the Intel Burn Test.



I am not sure why the vcore listed in HWMonitor is different from what I've set it at. I will run a 12 hour Prime95 test tonight pending further suggestions or recommendations from OCN members.
Edited by Qubits - 7/28/11 at 12:57pm
The Quadfather
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The Quadfather
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post #8 of 14
Your trials so far are making your CPU's overclocking ability look very promising. Just go up on anything one step and one change at a time.

Several members on this board including me use prime95 and 15-30 minute tests with custom settings.

Click custom and input these settings

Fft min/Max - 1344
Set your ram from 1600mb to about 90% (doesn't have to be exact). I have 8Gb so I choose 6000.

Do 20-30 minutes on that setting, if it passes change the fft to 1792 and re-test. It's looking like if you can pass those 2 for 15-30 minutes each, then you'll be good to go for the 12hr prime test.

This made a lot of sense, since a member figured out that those two numbers for FFT give the core CPUs a harder workout. Good luck and have fun! Keep the vcore nice and low. Your CPU is doing good so far!
Edited by CloudX - 7/28/11 at 7:02pm
x99 Liquidx
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x99 Liquidx
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Sandy z77 Pro
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post #9 of 14
after the trouble i had with my system, id thoroughly recommend load line calibration - you can bring your vcore down even more too

you ram running at 800 mghz is normal to me, thats what 1600 is, mine runs at that speed too, it's just ddr3,
Edited by Roksonixx - 7/28/11 at 4:01pm
My System
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My System
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post #10 of 14
great information right here...
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