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3930k Stable Overclocking

post #1 of 21
Thread Starter 
Hi everyone!

I'm rather new to the world of overclocking.

Now first of all here are my specs:

Asus Sabertooth x79
i7 3930k
GTX 680 4GB
32GB Ripjawz Ram 2133mhz
H100i Liquid Cooling

I read the Sandy Bridge overclocking guide, read a bunch of info on the forums and yet I can't get a stable overclock!

I use Intel Burn to test for stability and afterwards Prime 95 (once it would pass Intel Burn) but it didn't pass ANY setting. The only settings I've been able to succefully pass Intel Burn were the stock settings (After reseting bios).

The only overclock setting I've been able to test proving stable was 4.2ghz (X.M.P with everything else set to auto). That way I would get 62 Celsius on load (with 1.30voltage on auto) Intel burn and 32-36 Celsius ambient.

I think that's a little weird that the only way I would get an overclock stable is by setting the other parameters on auto. I tried 4.5Ghz once, let everything on auto and the voltage rose up to 1.420-1.440v and Intel Burn still said it was unstable. I quickly put it down again.

I also tried various other overclock settings with vcore 1.35 at 4.2ghz and vcssa 1.15, PLL 1.8 etc but still nothing proving stable.

I get 19874 Geekbench score now, which is still fabolous but I think this chip can do more. Please note that this is for 24/7 use so stability is very important.

Any assistance or tipps are greatly appreciated. Thank you guys!

Dave
post #2 of 21
Hello!

Welcome to overclock.net!

I've had better luck with manually adjusting the voltage. Hm... That's odd. Yeah, something definitely seems out of place.

What are the C-States of your motherboard set to?

What is your LLC set to?
Deus Ex Machina
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Deus Ex Machina
(19 items)
 
   
CPUMotherboardGraphicsRAM
i5 580M Dell 0R1203 NVIDIA Quadro FX 2800M Samsung 4Gb 
Hard DriveHard DriveOptical DriveOS
TOSHIBA MK3256GSYF  TOSHIBA MK3256GSYF  DVD-Rom HL-DT-ST DVD+-RW GU40N Windows 7 Professional 
Audio
Dell Computer 5 Series/3400 Series Chipset Fami... 
CPUMotherboardGraphicsGraphics
Athlon 64 X2 6400+  Asus M2N-E Nforce 500 SLi 8800GT  9800 GT 
RAMHard DriveOptical DriveOS
OCZ ReaperX WD LG lightscribe Multilayer DVD burner Windows 7 
PowerCase
Antec 500W Smartpower 2.0 Aspire X-Navigator 
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post #3 of 21
Hi, I'm running my 3930k at 4.625GHz (125 X 37) / 1.435V stable. (20 times Linx / 4+ hour prime) I think mine is just about the typical 3930k.

If you can't get 4.5Ghz by setting your multiplier 45X, try BCLK overclocking, say 125 X 36. In my case, bclk OC seems to be easier to stabilize. I can't get my 3930k stabilized at 100 X 46 at the same voltage but 125 X 37 works fine. You need to crank up VTT and VCCSA voltage a little bit (around 1.2V / 1.1V each) if you do bclk OC.

Be sure to set your load line calibration (or Vdroop or whatever they call it) so that your MB maintains voltage at load.
post #4 of 21
Thread Starter 
Quote:
Originally Posted by Whalemeal View Post

Hi, I'm running my 3930k at 4.625GHz (125 X 37) / 1.435V stable. (20 times Linx / 4+ hour prime) I think mine is just about the typical 3930k.

If you can't get 4.5Ghz by setting your multiplier 45X, try BCLK overclocking, say 125 X 36. In my case, bclk OC seems to be easier to stabilize. I can't get my 3930k stabilized at 100 X 46 at the same voltage but 125 X 37 works fine. You need to crank up VTT and VCCSA voltage a little bit (around 1.2V / 1.1V each) if you do bclk OC.

Be sure to set your load line calibration (or Vdroop or whatever they call it) so that your MB maintains voltage at load.

Thank you! I will try it. I set my LLC to Medium-High. I use X.M.P profile for my RAM (to get 2133mhz) should I use something different?.

What are your voltages for 125x37? Is it safe for 24/7 video work where stabillity is necessary?

Thanks!
Dave
post #5 of 21
Thread Starter 
Bump
post #6 of 21
As far as I know, you can't use XMP profile when you're doing BCLK overclock. Also, if you set BCLK to 125, your memory clock option is 2000 / 2333 and so on. I'd try 2000 with tighter CAS.

My voltage is 1.43 and I think it's totally fine for 24/7 use if your cooling is decent. (I'm using custom water cooling)
post #7 of 21
If you have an XMP for 1600 on the ram try that while playing with you're overclock on the CPU. Once you get your CPU happy then try bumping the ram up and see if that's causing the instability. Also wouldn't hurt to try pulling out some ram and giving it a go. I'm running the same MB and CPU as you and I'm at 4.8GHz at 1.4v but only running 1866 on my ram and only have 8gig. That's at 48x100 btw
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post #8 of 21
Thread Starter 
Hi guys,

Thanks for the anwers!

After I did a BIOS reset I used the "High Performance" tab from Asus which is the built in overclocking tool. It did a 126x33 Overclock at 1.304vcore (cpu-z) and it was very stable.

After that I tried 125X37 at 1.435vcore, 1.1VCSSA, 1.2VTTP, 1.8PLL and it didn't even boot, "Overclocking Error" F1.

So I did a 125x36 overclock with the rest at AUTO and I can boot into Windows and I see that it needs less vcore for such an overclock (1.38vcore) (I set 36 at Turbo)

The thing is I did an IntelBurn-Test and even though it was successfully tested stable I only had 129-130 GFlops (Same as I got with 126x33).

So I tried 125x36 (This time 36 being the CPU Ratio) and I still got only 120-130 GFlops.

Once I set 45 Multiplier (100x45) and I got 150 GFlops, but it wasn't stable.

In BIOS I see the speed of the CPU being 4ghz... at 125x36 (Weird thing is I can't even boot at 125x37, 125x36 works however)

What can I do? Any advice?

Best
Dave
post #9 of 21
If you are chasing GFLOPs turn off hyper threading. I get 110-120 with it on and 190 with it off. Also it's worth a shot to try 4.6 over 4.5, I've seen a bit of a hole between 4.4 and 4.6 on my chip where making it stable was a pita.
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post #10 of 21
Thread Starter 
Quote:
Originally Posted by BiaBia View Post

If you are chasing GFLOPs turn off hyper threading. I get 110-120 with it on and 190 with it off. Also it's worth a shot to try 4.6 over 4.5, I've seen a bit of a hole between 4.4 and 4.6 on my chip where making it stable was a pita.

Thanks! I'm not chasing GFlops it's something I noticed. Also I noticed that at 4.5Ghz CPU-Z shows 4.5Ghz but in BIOS I only see 4.050Ghz (Also in different applications I see 4.050Ghz) and it performs as slowly as 4.050Ghz so I'm not sure why I don't get 4.5Ghz when using 125x36 (can't boot with 125x37).

Any advice?

EDIT: Did a BIOS-Reset, did all over again (used high performance) and it gave me 126.5x33 (changed to 126.5x36) and all the other stuff on Auto and got 4.5Ghz with 1.376vcore and 137gflops stable on Intel Burn... should I leave it on Auto? Not really sure if I'm really getting 4.5ghz again.

Best
Dave
Edited by DaveVegas - 2/17/13 at 1:19am
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