Help setting manual offset voltage

daninthemix · 1 Mar 2015 at 19:17

I have an i5-2500k running @ 4.2 on auto voltage. Under load, Core Temp shows me 1.3561 vcore which seems quite high for such a low OC? What would I change the offset to if I wanted to try manually lowering it? I don't want a fixed voltage because my rig spends most of its time idling.

pastymuncher · 1 Mar 2015 at 19:29

You need to find what your cpu needs as a fixed voltage for a given overclock first. It will vary from cpu to cpu but for only 4.2Ghz I would start at something like 1.25v and stress test for stability. Work your way down until it becomes unstable then increase it back up a notch or two. Once you know what it needs for the overclock you can minus the stock voltage and what you have left will be your offset. Auto voltage is always a bad move due to overvolting most of the time. 1.3561v is massively more than you would need for 4.2Ghz.

daninthemix · 1 Mar 2015 at 19:38

pastymuncher said:
You need to find what your cpu needs as a fixed voltage for a given overclock first. It will vary from cpu to cpu but for only 4.2Ghz I would start at something like 1.25v and stress test for stability. Work your way down until it becomes unstable then increase it back up a notch or two. Once you know what it needs for the overclock you can minus the stock voltage and what you have left will be your offset. Auto voltage is always a bad move due to overvolting most of the time. 1.3561v is massively more than you would need for 4.2Ghz.

Thanks for the advice. So I need to play around with a fixed voltage and find what's stable. What is the "stock" voltage?

wazza300 · 1 Mar 2015 at 19:42

try medium or low loadline calibration

try medium first,then set cpu offset to -0.005v or -0.010v and then stress cpu and see what load cpu v is

daninthemix · 1 Mar 2015 at 19:46

I have LLC on regular (0% I think?) as my priorities are, in this order:

stability > heat / noise / power consumption > speed

Is LLC needed? I have the C states turned off except C1E because I'd heard they can cause instability when idle, and today I had a hard crash while idle (my first in 3 months, this is on auto everything).

pastymuncher · 1 Mar 2015 at 20:56

Everything on Auto is a mistake and as for the C states you want them on if you want maximum power saving. I have every possible power sving setting enabled plus some other tweaks for maximum power saving when idle/browsing the net. As I am here typing this my entire pc is only pulling 60w at the wall.