What makes a CPU overclock stable apart from the vcore?

dazkyl · Sep 17, 2014

With 4.4ghz @ 1.280v i was getting a BSOD while stretch testing after a few minutes.

Then i changed cache multiplier to 35 and changed the cache voltage and 4.4 is now stable at 1.240 instead of the old 1.280.

How can this be ?

chris987 · Sep 17, 2014

i wouldnt have anything lower than 1:1 ratio for the cpu cache memory. it greatly affects performance. better have a stable 4.3ghz than having to lower cach speed! also i suppose you have LLC increaced to high - very high as will help. also which specific hiper psu do you have?

dazkyl · Sep 17, 2014

chris987 :

I changed the PSU to bequiet 750w. I am right now at 4.4 with 1.25v with cache multiplier at 35 and 1.22 cache voltage.

Should i set the cache the same as the multiplier ? (44) ... Also does it really affects performance ?

Load line calibration is at level 1. Should i set it to the highest ? (lvl5)

chris987 · Sep 17, 2014

the 6MB cache your i5 has runs at cpu speed by default. of course there will be a performance penalty having it set at a lower speed than your cpu runs.i would set cache at 1:1 or auto and try to have a stable 4.3ghz. as for the llc i wouldnt max it out.! begin by level two and see how much it will affect stability. for such o/c i think a level 3 would be appropriate!

dazkyl · Sep 17, 2014

chris987 :

So after changing and tweaking some settings i have my i5 4670k clocked at 4.4ghz wit 1.25v and cache at 40 with 1.25v.

Try cache at 41 or try both cpu and cache to 43 ?

chris987 · Sep 17, 2014

well i still belive 43 multiplier on both core and cache would be better.if you manage to get it stable then try 4.4ghz, however there are bechmarks to determine the actuall gain or loss.

dazkyl · Sep 17, 2014

chris987 :

I tried both of them at 44 and stretch test failed. Cpu at 4.4 and cache at 4.2 is looking stable so far. Should i stick with it ?

chris987 · Sep 17, 2014

well its fine but to ensure stability a few minutes of stress testing wont be enough. a couple of hours at least and some excessive gaming would be ideal!

dazkyl · Sep 17, 2014

chris987 :

Sure. Any idea what is the highest recommended cache voltage for a 44cache , so i try to 1:1 it with the 44 cpu multiplier ?

chris987 · Sep 17, 2014

i havent experiment much with cache voltage but i wouldnt recommend having it higher than core. whatever i have tried i couldnt have mine stable at 4.5ghz with anything less than 1.3v so i stick to 4.4ghz as my h60 cant maintain acceptable temps at such voltage!

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What makes a CPU overclock stable apart from the vcore?

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