Overclock a 3930K

The Slayer_UK

The Slayer_UK

The Slayer_UK

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Joined
3 Dec 2011
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480
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Shropshire
Hi all

ive never done overclocking before so i thought id give it a go i did try a few months ago but then decided not to bother but i had another go today i overclocked it using the CPU strap i selected 125.00 which overclocked it to 4.3 i went into windows all ok but in cpuz the voltage was reading 1.475 which i think is too high so i tried putting down the voltage but im not sure how to i find it alittle confusing in what i need to adjust and do not want to put in a value which will screw up my computer.

Also can i overclock using the Asus AI suite?

Thanks
 
Don't use the Asus tools, they can put through too much voltage. Overclock using the multiplier and set a manual voltage.
 
ok but where do i set the manual voltage ive seen where the vcore is in the bios but it has offset mode and different ones to change and im not sure what to change it to
 
Change where it says Offset to Manual and then set a voltage manually, I use 1.3V for 4.6ghz with my 3930K.

You will find this useful:

he explains offset/manual at 38mins mark.
 
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ok so far ive got it clocked at 4.3 (in cpuz it says 4.375) and 1.290 vcore im using Intel burn test with custom settings testing 12gb of my 16gb ram (everytime i selected maxium it says cannot test more memory than i have so i set it to 12gb) 12 threads and 5 passes will that be ok to test the stability and if its stable ill try bit lower vcore does this sound ok?
 
here is a screen shot during the IBT

8ilpd.jpg


aplogies if the image isnt that clear ive resized it.

Thanks
 
I've been using Prime95 to stress my 3930K, for some reason when I run IBT whichever many threads I use the CPU doesn't seem to be maxed out.

With Prime95 I get a 180 Watts reading in Coretemp and a higher temp to match, in IBT performance seems to get capped at about 142 Watts and I haven't figured out why yet.... it seems to be some sort of power limit or something or perhaps IBT just isn't optimised for these processors.

How come you're using the 125 strap btw is there any advantage? I just set a 46 multiplier and left it at 100mhz.
 
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mmj_uk said:
I've been using Prime95 to stress my 3930K, for some reason when I run IBT whichever many threads I use the CPU doesn't seem to be maxed out.

With Prime95 I get a 180 Watts reading in Coretemp and a higher temp to match, in IBT performance seems to get capped at about 142 Watts and I haven't figured out why yet.... it seems to be some sort of power limit or something or perhaps IBT just isn't optimised for these processors.

How come you're using the 125 strap btw is there any advantage? I just set a 46 multiplier and left it at 100mhz.
Click to expand...

well IBT seemed to stress mine fully as you can see from the task manager and i just chose the strap cos that was the first thing i tried and thought 4.3 was a good start it slightly overclocks my ram from 1600mhz to 1666mhz as well not sure wheather there is an advantage or not i may try just setting the multiplyer how long did you test with prime95 for i did 5 passes with IBT
 
Mine shows 100% usage with IBT as well but it still seems to be underperforming, your Gigaflops is a little low I think so yours might be too.

Coretemp gives you a dynamic power reading and for some reason it won't go above 142W with IBT.

You should give Prime95 a try see if temps are any different.
 
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ok what i might do later is reset the strap to normal and set a multiplyer to 44 so its a 4.4ghz and leave the vcore as it is and then try using prime95 as ive just read this and it says prime95 is better and i think it says (if im reading it correctly) what you are saying about the power reading
 
Where does it say that I wouldn't mind having a read? I'm still unsure why IBT isn't stressing my CPU fully.

I've just tried LinX too which is also based on IBT and it's the same can't get over 142W of usage, whereas Prime95 goes straight to 180W.
 
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Nice one thanks I'll give it a read. :)

EDIT: He says IBT causes the CPU to pull more power than Prime95 but for me it's easily the opposite.
 
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no problem he also says this

So IBT really does pull more power. But then I tried seeing which would fail first. Prime95 failed first every time, and it failed when IBT would pass. So same as Sandy Bridge, Prime95 is a better stability tester for Sandy Bridge-E than IBT/LinX. Stability is subjective
Click to expand...

i think i will use prime95 and maybe use IBT for a few passes n see if its stable how long would you run prime95 for?
 
It's up to you really, usually if your system is terribly unstable it will fail inside a few minutes. As a start I would just run it 1-2 hour each on type (Large FFT, Blend etc).

If you want to be absolutely sure of stability just leave it going whilst at work or something.
 
ok ive just taken the strap back to normal and put in a multiplyer of 44 left the vcore at 1.290 (although it shows slightly higher in cpuz)

here is how it looks so far

n924s.jpg


By the way what it the max vcore you would recomend i see different numbers everywhere some say 1.4 but on that other site they were doing 1.6 i think

and thanks for all your help so far
 
The Slayer_UK said:
By the way what it the max vcore you would recomend i see different numbers everywhere some say 1.4 but on that other site they were doing 1.6 i think
Click to expand...

It's up to you really, I wouldn't go over 1.35V personally with it being a £450 chip.. I'm being extra careful and staying at around 1.3V as I plan to keep this long term. If you are fearless then it's probably going to depend on how good your cooling is, at over 1.4V you're probably going to need exotic cooling.

8 Pack said:
With Linx to get the best out of it you need he latest version and Windows 7 64 bit service pack one to enable AVX instructions.

New library is here http://www.mediafire.com/?3aa7yz5nxfkb97z
Click to expand...

Yeah I tried that mate it's still the same, doesn't load my processor as much as Prime 95 I've tried All, Auto, 6 & 12 threads all result in 10C lower temps and 142W power usage in Coretemp.
 
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