How to tell if 3930k needs higher voltage?

[core1911]

Hi, I am new to overclocking so I have a fairly basic question. I want to overclock my 3930k to 3.7ghz and I am not sure what I should set the voltage to. Speedstep is on, and when I run prime95 the voltage is at 1.240 volts and doesn't change at all. Do I need to increase the voltage? I haven't had prime95 running for long(about an hour). I am getting 45-55c temps at 100% load.

Oh, and I am using the sabertooth x79 and 16gb of dominator.

Thanks.

Edit: I should clarify that I have left the voltage at factory.

 

[core1911]

Well I just saw a post about running intel burn test, I ran 10 times testing all 12 threads at high stress and temps did not exceed 57c. Is my voltage therefore OK?

 

[kilobravo]

You should be able to oc to 4.0-4.2ghz without any voltage increase.Enable Overvoltage cpu pll and increase LLC to high.Take the multiplier one step up one at a time and test for stability.My 3930k is 100% stable at 4.5ghz @ 1.31v in bios,cpu-z reads 1.288v.

57c is within safe temps.Up to low 70c is good.Hope you have sufficient cooling.

 

[core1911]

You should be able to oc to 4.0-4.2ghz without any voltage increase.Enable Overvoltage cpu pll and increase LLC to high.Take the multiplier one step up one at a time and test for stability.My 3930k is 100% stable at 4.5ghz @ 1.31v in bios,cpu-z reads 1.288v.

57c is within safe temps.Up to low 70c is good.Hope you have sufficient cooling.

Hi, thanks for the reply. Yeah my cooling is OK but not the best, I am using an H100 but I need to improve my case airflow, I will be doing so at some point next week. After more extensive testing my actual CPU temp did not exceed 60c after several hours of stress but I have not monitored separate core temps.

 

[core1911]

Also I have another question. Is speedstepping necessary for a 2011 overclock? I have read that it is. Thanks.

 

[kilobravo]

Make some tests with your cpu enable/disable speedstep.Cant se any difference with my 3930k.

Speedstep is needed with 1155 sandybridge for better performance and stability.

 

[Firat]

Make some tests with your cpu enable/disable speedstep.Cant se any difference with my 3930k.

Speedstep is needed with 1155 sandybridge for better performance and stability.

Is this true, my 2600k is clOcked @ 4700mhz do you think I should enable speedstep? And my vcore is 1.36v @ LLC6 would it drop the vcore when speedstep kicks in? Lastly why is it better for speedstep to be on?

Thanks!

 

[kilobravo]

Is this true, my 2600k is clOcked @ 4700mhz do you think I should enable speedstep? And my vcore is 1.36v @ LLC6 would it drop the vcore when speedstep kicks in? Lastly why is it better for speedstep to be on?

Thanks!

Nice low voltage for stable 4.7ghz oc

Intel EIST(enhanced intel speedstep) should be better for stability and decrease power usage needed.A i said above,try for yourself and se if its true for your system.

EIST

 

[core1911]

Is this true, my 2600k is clOcked @ 4700mhz do you think I should enable speedstep? And my vcore is 1.36v @ LLC6 would it drop the vcore when speedstep kicks in? Lastly why is it better for speedstep to be on?

Thanks!

Yup, as I currently have it enabled I can see that it drops vcore and dramatically decreases temps when idle, but as kilobravo said you should experiment.

 

[core1911]

Nice low voltage for stable 4.7ghz oc

Intel EIST(enhanced intel speedstep) should be better for stability and decrease power usage needed.A i said above,try for yourself and se if its true for your system.

EIST

Thanks for the help so far, would you say that a 70c average for core temps is OK? On the intel website Tcase is listed as 72c, I assume that this is outer case temp? I am getting nowhere near this. Is there any idea of the TJ Max for the 3930k?

Thanks.

 

[tinytomlogan]

EIST should be disabled for overclocking...... it will lower temps when idle but it will actually make a rig more stable when off and running a cpu on its limits.

 

[Firat]

EIST should be disabled for overclocking...... it will lower temps when idle but it will actually make a rig more stable when off and running a cpu on its limits.

That's what I thought

as I hate voltage fluctuations.

Thanks

 

[core1911]

EIST should be disabled for overclocking...... it will lower temps when idle but it will actually make a rig more stable when off and running a cpu on its limits.

Cheers, I'll turn it off then.

 

[Techie103]

EIST should be disabled for overclocking...... it will lower temps when idle but it will actually make a rig more stable when off and running a cpu on its limits.

TTL Saves The Day Once Again!

I can see why EIST would be useful on laptops, tablets, etc, but not on a desktop (except for HTPC builds of course)