OC Help on this aging i7 2600K & P8Z68-V/GEN3 Mobo

lettuce · 22 Nov 2020 at 13:54

So my previous system went bang and not wanting to build my new AMD system until early next year so i was kindly give this mobo and cpu and want to OC it slightly. These are my current OC settings......

anything else i should alter or look at changing slightly??

lettuce · 22 Nov 2020 at 20:20

OK thanks ill disable CPU Spread Spectrum .

Yeah i have the Noctua NH-D15 cooler so should be ok on that front.

So its ok to leave the CPU PLL Voltage on 'Auto'?

Even at only 4.2GHz and 1.25 voltage im getting system crashes after a few minutes when using x264 Stability Test. I was under the impression 1.25v would have been more than enough for just a 4.2 OC?

lettuce · 23 Nov 2020 at 18:10

Thanks ill give those settings a go.

One question i couldnt work out how to unlocked 'By all cores' setting so i could actually adjust the Multiplier of the CPU it was fixed on 'Auto'!!. The only way i could get it so i can enter in my own value was to run the 'OC Tuner' option which set its own OC and then when the system restarted to go back into the BIOS then i was able to change the multiplier but im not sure what else running the 'OC Tuner' changed in the BIOS???

Also when you say leave PLL on auto, do you mean 'Internal PLL Overvoltage' or 'CPU PLL Voltage'

lettuce · 24 Nov 2020 at 12:05

Ah actually i made a mistake its not the PRO version of the motherboard just the standard version, P8Z68-V/GEN3, i was sure it was the PRO version!!!. (ill change the title of the thread if i can)

That might explain why im getting near high 60s on the core when only trying a 4.4ghz OC at 1.28 volts??. Core 3 seems to be getting a good 4-6c hotter than the other cores, is this normal for Skylake CPUs?....maybe the thermal paste didnt spread evenly

Also for Realbench, what do you set the memory usage at 4 or 8GB??

lettuce · 25 Nov 2020 at 10:10

Ok, I'll do some more testing. I have noticed that the core seem to stick at 4.4ghz even when not stressed, they should be down clocking when idle but dont seem to be for some reason?

lettuce · 25 Nov 2020 at 11:44

MartinPrince said:
That features has to enabled elsewhere in the bios, normally called Speedstep but can't check as don't have the system anymore. You can also get the voltage to drop when idling using the offset method but that can introduce instability unless fine tuned properly.

Yeah im sure i have that enabled, ill have a look to make sure

lettuce · 25 Nov 2020 at 19:15

Ah yes it was the Windows Power Management settings. Odd i never remembered setting it to High Performance, ive changed it to balanced. All seems good now!!!