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Need Help with i5-2500k OC

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  • Overclocking
  • CPUs
Last response: in Overclocking
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October 18, 2013 7:45:02 PM

Hey, I've recently started OC'n my CPU. I've read OC manuals from here and overclock.net, along with a youtube video on OC'n a 1155 chip.

The problem im having right now is my games i.e. GW2 is crashing/freezing then sometimes restarting my pc. Im at the point where im trying to find a stable VCore, im currently at 1.325v and i feel like im already pretty high for a 4.5GHz oc. I've heard doing an offset could help with that, problem is I'm not to fimiliar with that and would like some advice or some stats of some stable 2500k OC'd 4.5's.

Or is my pc crashing bc other reasons?

Also should I keep Internal CPU PLL Overvoltage on auto? or enable/disable it? would that help?

I have evga precision x, gpu-z, cpuid, hwmonitor, OCCT, heaven benchmark 4.0 advanced and I've ran prime95 for 2hrs with no problems.

Mobo: Gigabyte Z77X-UD5H
CPU: i5-2500k
GPU: 2 SLI EVGA 670GTX (SC)
PSU: EVGA G2 1300W
RAM: 32GB Corsair Vengance
SSD: 250gb Samsung 840 Series
HDD: 1tb WD
Liquid Cooled: CPU & Both GPU's (2 x 2Rads)

More about : 2500k

a b K Overclocking
a b à CPUs
October 18, 2013 7:50:34 PM

set LLC to high..some require 1.35 or more for 4.5 stable :) 
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October 18, 2013 8:10:48 PM

LLC is set to extreme...should I lower it to high?
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a b K Overclocking
a b à CPUs
October 18, 2013 8:15:24 PM

if you're using offset voltage id probably use turbo/high LLC but, with fixed probably extreme/turbo so i feel like you're on the right track. the stability tests you mentioned above can't really say for sure if you're stable in certain games and programs but, i've had luck using AIDA64's stress tests because it'll stress most of the CPU's instruction sets unlike P95 where it doesn't touch these other areas.

id say just leave your CPU PLL @ Auto
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October 18, 2013 8:31:31 PM

Ok thanks for the advice guys. Ill just keep increasing vcore +.005 until hopefully it doesnt take 1.35v

At 1.33v
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a b K Overclocking
October 18, 2013 11:53:06 PM

Turning on PLL Overvoltage or manually increasing PLL voltage (dont exceed 1.89v maximum) could help you to reach stability, actually.

My 2600k does 4.5ghz on ~1.325v auto/offset voltage, but only with LLC3 or higher and PLL overvoltage on. As I recall, using manual voltage it required ~1.35v+. Of course, every CPU is different.

I'd start with LLC on Extreme/the highest setting, PLL overvoltage on, and find the needed vcore, then dial back the LLC/PLL overvoltage to determine exactly what you need to be stable.

Other pointers: If you're turbo overclocking, set the turbo power limit to 200, and when using offset, don't forget to disable Cstates (all but C1, as I recall).

Running P95 for 10-20 mins on custom with 90% memory is a good, quick, rough indicator of stability. Running memtest86 to test for memory stability after you find your desired overclock is a good idea.

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