3750k overclock issues

h4wks

h4wks

h4wks

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Joined
6 Apr 2011
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124
Morning gents (and ladies?),

I have been having a crack at overclocking my 3750k over the past week or so having done a large amount of research and reading.

I would like to be able to overclock at 4.4-5ghz using the dynamic vcore (& power saving options?) so that I can have reduced voltage's when idle, browsing the net etc.

This is where I have been encountering problems. My chip is stable at 4.3ghz with a voltage of 1.21v, ran Prime95 for 6hrs. When I change the voltage from the specified 1.21v to Normal and set up the Dynamic Vcore at 0.0v offset the voltage I get under load is really high, over 1.3v. To counteract this I went back into the bios and adjusted the offset and tested. At 4.3ghz the lowest stable offset I could use was -0.030v which under load gives me a voltage of 1.26v, higher that I'd like and I know the chip is stable at 1.21v. The main issue is that any further negative offset I introduce is causing the system to either freeze before boot or BSOD when idle. The negative offset doesn't seem to be getting enough voltage to the chip when not under load.

Any suggestions :confused:
 
1.3 isn't really high, why are you setting it back to normal you can set a voltage and work out your offset from that?
 
Use a fixed voltage, not ideal if you want to save energy but offset is not ideal to use for high overclocks, as you have found out it will fail at idle as it's also reducing idle voltage.
 
spoony77 said:
Increase LLC to compensate?
Click to expand...
Will increasing LLC increase the voltage at idle only or also when at load? I currently have this left as default (auto).

Demons UK said:
1.3 isn't really high, why are you setting it back to normal you can set a voltage and work out your offset from that?
Click to expand...
In order to use the dynamic v-core (offset) you must set the voltage to Normal on my board. Under Normal the bios/board seems to pick a voltage it deems necessary for the multiplier. This is somewhat too high at load, or at least higher than I know the chip needs to be stable.

hyperst said:
Use a fixed voltage, not ideal if you want to save energy but offset is not ideal to use for high overclocks, as you have found out it will fail at idle as it's also reducing idle voltage.
Click to expand...
I'm not overly bothered about saving energy. In general do you guys turn off all power saving and just have your overclocks running at a fixed voltage and Ghz at all times? Is that OK for 24/7 use? I notice my multiplier reduces to 1600 when idle and the voltage drops too, albeit too much with the negative offset.
 
you need to balance the cpu load voltage by testing with different llc levels and dvid amounts(dvid amount is only applied at load along with llc to the normal cpu amount)

power saving shouldnt affect stability at all imo

running 4.5ghz with all power saving enabled on two machines here just fine

heres a rough guide for 4.5ghz different board but still a gigabyte z77

http://forums.tweaktown.com/gigabyt...-th-z77x-up5-th-overclock-settings-guide.html
 
Thanks Wazza, I actually ran into this very article during my research :cool:

When you say you have all power saving enabled do you have all of these set to Auto? Turbo mode too? I note you didn't upload a picture for this page in your post: M.i.t\Advanced Frequency Setting\Advanced CPU Core Features

Ideally I would like to persist with the power saving and offset voltage, even if it is not the most straightforward.
 
yeah everything is left auto/stock,the only changes are in the screenshots i posted,setup your ram to the ram speed you have though not 2133mhz unless your rams samsung green
 
wazza300 said:
you need to balance the cpu load voltage by testing with different llc levels and dvid amounts(dvid amount is only applied at load along with llc to the normal cpu amount)
Click to expand...

So the negative offset only applies when I'm at load? Any ideas why I'm struggling with stability when not at load at 4.3 and 4.4ghz?
 
you mean -0.0xxx dvid? that takes off whatever amount in dvid off the normal cpu voltage(each cpu will be different in how much normal uses)

if you want to undervolt you use - dvid and to add voltage you use +

if your crashing in idle clocks you might need a higher llc/lower dvid or lower llc/higher dvid

it is tricky to judge the right amount just keep checking in cpu-z to see how much cpu voltage is being used at idle and load

it should use less than 1v idle and anywhere between 1.2v-1.3+ at load depending on your cpu
 
Apologies, yes by offset I'm referring to the dvid.

I have -0.030 but that is still a bit too high at load for my liking (1.26v @ 4.3ghz). I know the chip is stable at 1.21v @ 4.3ghz as I've tested it using the manually specified voltage. Unfortunately any more negative dvid (-0.035) in an attempt to drop this load voltage results in instability when idle and a BSOD.

I've had a brief play with the LLC at the -0.035 dvid but this didn't seem to make any difference, most of the time windows wont even boot.
 
You can set a voltage and use offset voltage, you have the same board as me apart from mine is the z77x.

You need to adjust the voltage in the voltage setting if i remember correctly or click on normal and it will allow you to input a voltage.

have a play as its defiantly possible.
 
I have very similiar problems.i am currently running at [email protected],this is the lowest i an get my vcore stable!i am running llc at standard with a -0.003 offset,any lower and i get bsod,i have been expeimenting for a few weeks now,although my voltage is higher than i would like,strangly my temps never go above 65*c in gaming and 75*c while stressing,with a hyper212+ cooler,and 2 year old arctic silver paste!! amazing when some people spend loads on water cooling .
 
I'm starting to think it's something related to the board I must admit. Spend so long adjusting offset and LLC at every conceivable setting at I just can't get 4.4ghz stable at any load voltage lower than 1.29v.

I have the very same thing in that even under stress at 1.29v my temps are 65C, so many blue screens though. I'm thinking of knocking it on the head for the time being and being satisfied with 4.3ghz.
 
What bios are you using? Try with the latest final BIOS,seems to be overvolting issues with the latest beta's
 
Tbh I find either my cpu is pretty duff for overclocking voltage wise or the board just isn't good enough but I'm sure it's mainly the cpu..
 
my blue screens have now stopped,i keep most volltages on auto,except vcore and cpu pll which ,on advise dropped to 1.7,if iadjust anything else i seem to blue screen,llc,standard,offset 0.003,i got my cpu very cheap so im not complaining too much,i dont think you should worry too much if you can keep your voltages below 1.35v and your temps are ok,i am now happy , but will keep trying!
 
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I'm running bios F18.

Had a play around with 4.3ghz over the weekend and seems a lot more stable even if it does require quite more voltage that I thought.

4.3ghz, LLC: low, DVID: -0.005v Under load I'm @ 1.26v, temps 65-68C

Running Prime 95 overnight, no blue screens apart from when FarCry3 owned my 7870!!
 
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