Vcore on i72600k @ 4.6Ghz

[MaxY1234]

Hello everyone,
I'm new to the forums and am having trouble when I overclock my CPU to 4.6ghz.

My build is :

Coolermaster 212 evo
i7 2600k
2 4gb corsair vengeance RAM
750W PSU
Asus p8z68 -v lx mobo


I get around 1.4 vcore when I run stress test with CPU clocked at 4.6 ghz when I read that usually it should not exceed 1.35. I am also having difficulty with the offsets for the CPU voltage so right now it's on auto. Also my board does not have the section with DIGI + vrm and the only available options for LLC are auto/enabled/disabled.

Any help is appreciated thanks!

 

[omega21xx]

Try disabled for LLC, then try enabled, you should get a more solid Vcore with it disabled and let you find a general voltage you need for your overclock, once you find it you can play more with finding something lower. If you don't need Hyper threading you can disable that and it should allow you to lower the voltage some more.

 

[MaxY1234]

Thanks omega for the reply, I'll try that when I get home tonight. Do you have any tips for the voltage offset with the +/-? I'm still iffy on how it works.

 

[madchemist83]

Try manual voltage first. Let's say 1.3v. Then try upping ur multi starting with 40. Go till it crashes. Then raise voltage a bit, see if it boots. Work ur way up till u get stable boot.

 

[omega21xx]

Thanks omega for the reply, I'll try that when I get home tonight. Do you have any tips for the voltage offset with the +/-? I'm still iffy on how it works.

Personally I used fixed voltage instead of offset. I like to have a stable solid voltage vs one that changes too much on load and idle, not too concerned about power use. I'll probably fiddle more with getting good idle voltage when i have a chance, I was in a rush since i just got my build recently. When i used offset i got uncommon voltages, but at 4.4-4.6 you should be able to use a +0.10 or +0.15 offset. test under load and check voltage though, for me it was really unpredictable unless i had LLC off.

 

[madchemist83]

Actually with offset it's more stable under load.

 

[omega21xx]

Actually with offset it's more stable under load.

It should be, when i was tweaking with offset i'd get voltage higher than 1.35 under load regardless of my LLC or PL over volt settings. I need to play more with it before i see whats going on. for now i'm stable 24/7 with prime with a fixed voltage under 1.35 so i'm fine with that until this weekend when i have more free time to play

 

[MaxY1234]

I also wanted to use fixed voltage however my asus p8z68 -v lx motherboard only allows me to change the voltage through offsets.

 

[omega21xx]

Have you tried messing with the LLC and pll overvolt settings? they should help you get what you are looking for when testing for stabilty.

 

[MaxY1234]

I just disabled my LLC and PLL overvolt settings and ran a prime95 test but got BSOD at 1.38v. Is there any other settings that I'm missing?

 

[madchemist83]

Put llc on enabled. Does it give u extra option?

 

[omega21xx]

Try PLL overvolt off and turn on LLC. if your chip isn't stable at 1.38 at that speed you either have a very picky chip or it's too high a voltage. have you tried disabling hyper threading?

 

[madchemist83]

Haha ... Beat u to it

 

[omega21xx]

Haha ... Beat u to it

Had work distractions lol

 

[madchemist83]

Yeah whatever .. I'm at work too

 

[MaxY1234]

Ok I just disabled PLL overvolt and enabled LLC. My LLC only has 3 options: auto, enabled, disabled. I thought the point of getting an i7 is to have that feature of hyper threading? Sorry I'm still a novice at CPUs and overclocking. Thanks for the help so far guys. Oh yea my offset is at + 0.085 right now if that information is relevant.

 

[MaxY1234]

Whoa, after I enabled LLC my vcore shot up to 1.456

 

[omega21xx]

Whoa, after I enabled LLC my vcore shot up to 1.456

keep it enabled and try a lower offset. find the lowest stable offset below 1.35v underload. I was just suggesting disabling HT to test It's easier sometimes to find stable settings with it off, then once you have those stable settings you should be able to do a tweak or two to get it stable with it enabled.

You may be at work also mad, but i'm stuck on a crappy dell optiplex 740 haha

 

[MaxY1234]

What about these settings: Enhanced Intel SpeedStep Technology, Turbo mode, CPU C1E, CPU C3 Report, CPU C6 report. So far they are all on auto/enabled.

 

[MaxY1234]

Ok so far I've disabled PPL overvolt, enabled LLC, disabled hyperthreading, and did an offset of - 0.015 and when I run stress test I get vcore 1.35v underload . Does that offset look about right? Is every cpu's auto voltage different? And based on that, we offset it either + or - to the vcore that we want underload? Btw, thanks omega and mad for helping me!

 

[MaxY1234]

Also would you guys recommend I leave hyperthreading on or off? I mainly use the computer for gaming and occasionally programming. Also, do I test if my CPU is stable using OCCT, IntelBurnTest, or Prime95? and for how long? thanks again guys!

 

[madchemist83]

No problem. Now try manual voltage and lower it as much as possible. Then switch to appropriate offset

 

[omega21xx]

Also would you guys recommend I leave hyperthreading on or off? I mainly use the computer for gaming and occasionally programming. Also, do I test if my CPU is stable using OCCT, IntelBurnTest, or Prime95? and for how long? thanks again guys!

Hyperthreading has very little use and hurts fps in some games, I saw you mentioned the C1 state, that should be disabled. sorry i tend to forget that and assume everyone knows to turn that off.

 

[madchemist83]

I have it on auto. C3 and c6 need to be disabled of you have problems booting

 

[MaxY1234]

Thanks again mad and omega for the quick responses. Can I ask why C1E needs to be disabled?