Strange Unstability on overclocked i5 2500k

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Theokondak

Theokondak

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Jul 11, 2010
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Well, couple of days back i tried to overclock my i5 2500k.

I red a lot of articles on how to, i became somewhat familiar with the terms and then i tried to overclock my cpu gradualy to 4.4ghz.

My current Hardware:
Mobo: Gigabyte GA-Z68X-UD3H-B3 bios v f8 (latest stable)
RAM: gskill f3-17000cl9-2gbxl x2 slot 1,3 and 4gb x2 slots 2,4 .total 4 dimms
PSU: Corsair CX600
GPU: ATI 7870
2 Screens pluged in.
HDDs:
I got several HDDs plugged in.
119GB OCZ-VERTEX4 ATA Device (SSD)
55GB OCZ-AGILITY3(SSD)
465GB Western Digital WDC WD5000AAKS-00YGA0 (SATA)
931GB Western Digital WDC WD10EVDS-63N5B1 (SATA)
1862GB Western Digital WD My Book 1140 USB Device (USB (SATA)) (external supply)
3726GB Seagate Expansion Desk USB Device (USB (SATA)) (external supply)


My BIOS menu settings: http://goo.gl/Ww027g

To the point now:
Even though my CPU used to be fine at 4.4ghz nowadays it seems that i can't get a stable overclock even at 4ghz.
Temps during Linpack stress test went up to 68-72Celcius (161.6 Fahrenheit)
Linpack stress test settings :
Times to run 5
Threads: 4
Stress level: Standard.

The way i up vcore voltage is to let it on auto at the first place, and then run stability tests and gradualy downgrade it.The auto value placed by mobo was 1.36v, first stability test was ok, but the next day i tried to use the PC on normal overload, and it kept crashing.

Also, i tried to overclock RAMs.I kept frequency at 1600 and droped timings to 8-8-8-24.I runed MaxxMem test and everything seemed fine (runed the test at 3.3ghz and 4.0ghz).

Strange thing is that CPU-Z core voltage value in windows is 1.044 - 1.056 nomatter what i set in BIOS.

Meanwhile, bios crashed at some point, and the secondary bios autorestored back to f3

version.After that, i reflashed f8 version and since the strange behavior in CPU Z started.

Ram Stress Test APP: MaxxMem
CPU Stress Test: Linpack
Temps: Core Temp
System Info: CPUID CPU-Z

All of the above latest versions.

UPDATE: Whenever i run Core Temp, PC freezes.
 
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4Ryan6

4Ryan6

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Apr 14, 2002
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If you did not start overclocking until 2 days ago, how did you arrive at the assumption your CPU clock at 4.4ghz used to be fine?

I see some wrong with what you're doing and your miss-matched memory is part of the problem along with running it at 1600mhz on a CPU that was designed to run 1066mhz or 1333mhz memory, 1600mhz is overclocking the CPU memory controller which may be fine to tweak up to later, after the fact of arriving at rock solid stability, but not out of the overclocking gate.

So do you want to make some adjustments and get a serious solid overclock or keep stumbling around in the dark?

 
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Theokondak

Theokondak

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When i purchased the PC components a friend of mine overclocked it to 4.4 for me.Later on, i had some issues and had to clear CMOS so overclock settings lost once and for all.

Probably i want to go for a stable overclock, but it seems like there are too many terms and variables for a newb like me to play with.I am defenately going for the adjustments and a sollid overclock if i am able to find a solution.

And by the way, the whole purpose of the overclock is to get better performance for video editing.

 
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Theokondak

Theokondak

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Thanks for sharing.I got some knowledge from this thread but it didn't solve the issue.The pc keeps freezing every now and then.

After some testing, i found out that probably its some of the settings i used even before i started trying any overclock.That is, because last night i tried overclocking from 3.3 to 4.4 (RAMs on 1333 11-11-11-34 at 1.6v) along with other ram settings and every single time i runed Chrome, or sometimes after i launched MaxxMem the PC froze.After a lot of testing, i did a CMOS clear and the problem seems to be fixed since i am using my pc with default bios settings and it didn't crashed for hours.
 
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4Ryan6

4Ryan6

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Apr 14, 2002
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Try 1333mhz at cas 9 = 9,9,9,24 with a 2T or 2N command rate whichever you M/B supports at 1.50v or?
Try 1333mhz at cas 7 = 7,7,7,21 with 2T or 2N CR at 1.50v?

Are you trying to run all 4 miss-matched modules or did you drop to one dual channel set?
 
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Theokondak

Theokondak

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Having the RAM at 1.6v seems to be one of the mistakes.Today, i did plenty of testing, and the best i could get is 4.2ghz at 1.375v (maybe i can go a bit lower on that) and 8-8-8-24 @1333 and 1.524v for RAM.I could not get CPU further.I tried 4.4 @ 1.385v which seems a bit too much for the clock.I've seen some tables and for my CPU they usually stay about 1.350v even for higher overclocks.

Also,i've disabled LLC.

I have all RAM modules on.Yes.

EDIT: After couple of hours of semihard usage, pc froze.
 
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