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Need help overclocking a i5 2500k? What am i doing wrong.

post #1 of 3
Thread Starter 
Hello, i am newbie to this forum and overclocking in general and this is my first attempt so i am starting with a mild OC. I am trying to get to 4.0Ghz stable but i am still getting blue screens with 00124 error type which in most cases as i read is hard to decide upon. But i am thinking my PLL voltage is a very likely culprit.

My Initial Settings for the 4.0 Ghz overclock:

Mobo: Asrock P67 Extreme 4 rev. 3
Memory: ADATA 4x2GB 1600 DDR3 @1333, for some reason system will not boot running them on 1600.
PSU: Corsair AX 850 80+ Gold
Cooler: Xigmatek Hyper 212+ with Noctua NF-F12 PWM Fan

BIOS Settings:
C1E and C3,C6 States on enable and auto
Speed Step: enabled
CPU PLL Overvoltage: Disabled
CPU Spred Spectrum: Disabled
Turbo Boost Power Limits Short/Long: Auto
Vcore: 1.20v Fixed
LLC: Level 2 (Level 1 is the highest)
PLL voltage: 1.708v
All other voltages on Auto. Memory voltage is right - 1.35v.

First time i tested 7 hours on Standard Blend in Prime95 was ok. But then when i watched a Youtube clip i suddenly got an 00124 Blue screen.
Max temperature of cores was 53C seen in coretemp and realtemp which i believe is ok.

Then i changed:

vcore 1 step: 1.205v
LLC raises it to about 1.208-1.216 seen in CPU-Z
On full load Prime95 it drops to 1.20v - 1.208

This time i tried the 1344/1792 FFT tests in Prime95 and got a blue 00124 on the 1344 in the first 3 minutes.

Then:

vcore 1 more step: 1.210v
LLC raises it to about 1.216 seen in CPU-Z
On full load Prime95 it drops to 1.208v

This time i got both 1344&1792 tests passed each 20 minutes of running. Then i decided to do a long run Standard Blend Test. And then i got a 00124 after 45 minutes of testing.

At 4.0 Ghz i get 1.3761 max on the VID and 1.208v min on vcore on full load Prime95 which gives me around -0.17 offset.

What should i do next, please give me some advice? I believe 40 multiplier to be ok with stock 1.20v on vcore or am i wrong? Either i messed badly with PLL or i got a poor chip or mobo.

Now i am trying 1 step down on the PLL voltage around 1.688v. I'll see how it goes.
post #2 of 3
Are you using manual voltage?

If so set C1E to enabled and c3/c6 to auto. If that doesnt work try putting C1E to auto, then try again. I had a lot of problems with 124 BSOD and it was down to the combination of the power saving features of the cpu.

Also if you can prime95 the cpu, dont change the cpu vcore settings once you start getting idle 124 BSOD, they are not likely to be down to not enough vcore, but like you say potentially PLL voltage or power saving.
post #3 of 3
Thread Starter 
Hi Silent and thanks for your post!Yes i am doing manual voltage. C1E state has only enabled & disabled but no auto. I believe it should be enabled as well as the other states. i read that c3&c6 could be disabled for higher 4.5+ clocks. I think i'll keep the vcore as i will try a 4.2 OC next once i am good and stable on 4.0 as i see my chip is not going to make it on stock vcore at 42x100 :-)
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