Why can I not go higher in multiplyer without fail?

[Evolee]

Hey guys!

I am new here and I need some help with my overclocking

I am trying to OC my rather old i5 2500k cpu on my GB Z68XP-UDP3 (BIOS F10) and in relation herewith I have been following THIS as a guideline for my own OCing.

I know that the CPUs are different, but nonetheless I am curious of why I cannot go higher that x42 in the multiplyer, following roughly the same settings as sceenshots on page 3 by "krose".

The major difference between his and mine settings is, that I have PWM Frequencies on [AUTO] as well as CPU Over Current Protection [AUTO].
My RAM settings is also very similar; I got DRAM timing on AUTO and the rest is the same.

So here is the problem: My voltage settings are DVID +0.005, QPR/TT 1.075 - the rest is the same.

However, when I read my CPU-Z vcore during load, I get a 1.272v, unlike his 1.284. And if I just go to DVID +0.000, the system becomes unstable (one of the cores will shutdown during the p95 test), but becomes perfectly stable on +0.005.

Is the cpu difference really that great? That I have to run DVID +0.005 to get stable at x42, while he can do DVID -0.015 and get stable at x43.

I don't get it!

Please cast some light upon this matter

 

[Evolee]

Thanks for the quick reply guys!

I am using a freshly installed CM Hyper 212 evo - but temperatures does not seem to be the issue (although they are a bit high as I only have a single intake fan).

I tried overclocking it the "normal" way to 4.5 ghz using vcore settings and multi-step load-line, but I felt that the voltages and thus temperatures got too high (can't really remember the settings). The idle voltages was quite high, too. Therefore I am doing it the other way.

The funny thing is, that I am able to do 40x while the DVID is set to -0.025 @stable - but it takes DVID +0.005 to do 42x? Doesn't that seem like quite a big jump for 2 more multi?

 

[Evolee]

Yeah I suppose... I think Ill just keep it at 42x then - I dont think it will be worth the extra voltage going to 43x, even though I do believe I can keep the max temperature around 75-77 degrees on full load. Just not as healty I suppose

Thanks for the help guys