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Trouble overclocking 2700k/GA z77x ud3h

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January 2, 2013 4:09:06 AM

Hello TH community.

I'm having a bit of trouble overclocking my new rig, I am trying to achieve a 4.5 ghz OC on my 2700k, which from what I have read should be easily obtainable on air.

The first issue I'm having is that going from 4.4 ghz to 4.5, I have to up the voltage from 1.29 to 1.32 in order to get it to run stable(I can get 4.3ghz at 1.26 volts stable as well). I'm not 100% that it's stable but i've run prime 95 for 2 hours and was gaming for most of the day and it ran fine. I may be wrong on this but 1.32 V seems like a lot to get 4.5 stable. Also the temps after running prime 95(2 hrs) were in the high 70's, I was expecting much lower temps with the hyper evo 212 cooler. EDIT: Idle temps are high 30's/low 40's on all 4 cores.

My rig is as follows.

NZXT phantom case
cooler master 650W PSU
GA z77x ud3h mobo
i72700k / hyper evo 212 ( 4.5 ghz @ 1.32v)
16 GB g skill rip jaws X ram 1600mhz 9-9-9-24 2t(4x4)
San disk 120 gb SSD
EVGA nvidia GTX 260(stock)



BIOS settings(newest bios):

x45 multiplier 100mhz Bclk

internal CPU overvoltage - Disabled
turbo boost - Disabled
HT - enabled
C1E - disabled
C3/C6 - disabled
cpu thermal monitor - disabled
CPU eist - disabled

memory performance enhance - extreme
channel interleaving - enabled
rank interleaving - enabled


PWM phase control - extreme performance
vcore response - fast
vcore LLC - extreme
GFX LLC - extreme
DDR LLC - extreme
CPU LLC - extreme

vcore current protection - auto
DDR current protection - auto
gfx current protection -auto
CPU current protection - auto


cpu v core 1.295 bios 1.32 CPU - z
VTT - 1.050(auto)
PLL - 1.75 (tryed lowering from 1.8 as I heard this can help stability)
IMC .925v(auto)
dynamic gfx -(auto)



Last BSOD when failing 1.308 V(CPU-Z)@4.5 ghz was error x101


I'm wondering if my bios setting's, temp's, voltages are within the norm for a 4.5 ghz OC.

Any advice is appreciated.
a b K Overclocking
January 2, 2013 8:50:40 PM

I'll give you an example of what I had to do on fixed voltage for 4.5Ghz on my 2600k...

1.325v was the least she would run IntelBurnTest on. Temperatures with that went nearly 80C (I'm not happy if I'm over 70C in IBT personally). IBT runs my temperatures about 7-10C higher than Prime95 ever does, so I use IBT to really see what my max temperatures will be.

However, now with experimenting with an offset voltage I was easily able to obtain a stable 4.5Ghz at +0.025v added to it in offset mode which allowed the processor to reach a max of 1.315v or so. How it was completely stable like that compared to 1.325v at fixed, I'm not absolutely positive. But the offset made getting 4.5Ghz easier for me. But the wall I hit at 4.6Ghz was showing. I could run 4.8Ghz at 1.4v and run IBT but it was a bit too hot for my 212+ at over 85C so I backed down. I settled at 4.4Ghz honestly.

Either way, it sounds like you've found the wall for your chip. Looks like you're going to be boosting voltage in large increments the further you want to go past 4.5Ghz much. :) 
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January 3, 2013 12:46:10 AM

Big Update!

It's seems like once you start getting into higher clocks you need to raise the CPU VTT a tad in order to maintain stability. By changing the VTT from 1.050 to 1.060 I'm now able to turn the vcore down to 1.295 from 1.32, been running stable all day, hopefully all is well at these settings.

Now If only I could get these temps down a bit, ran prime 95 for 90 minutes and i'm still getting 75 c max temps.
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a b K Overclocking
January 3, 2013 2:10:28 AM

That does seem a bit hot honestly. Are you running dual fans on that 212? I know from stock setup to a pair of FM-121's on mine there was a notable difference in load temperatures.. and of course the loudness of the fans. :) 
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January 3, 2013 3:35:50 AM

Not sure exactly why its so hot, it could be the inadequate amount of case fans. As of now my case is just stock from the factory, so it only has a 200mm on the top, a 120mm fan on the back for exhaust and 2 small fans on the side for cooling my HD's. I'm wondering if adding a fan on the front for intake, as well as maybe a 200mm on the side panel facing the cpu might make a difference.
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January 3, 2013 4:30:13 AM

steddora said:
That does seem a bit hot honestly. Are you running dual fans on that 212? I know from stock setup to a pair of FM-121's on mine there was a notable difference in load temperatures.. and of course the loudness of the fans. :) 


and no there is just 1 fan on the 212.
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