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i5 2500k + P67 Extreme 6 - Weird issue going any higher than 4.8GHz

post #1 of 8
Thread Starter 
First time poster, long time lurker so hello!

Anyhow, to the point:

Got myself i5 2500K with 2x4GB G.Skill Ripjaws X (1600MHz) and AsRock P67 Extreme 6.
I can manage 4.8GHz stable EASILY (as seen here http://valid.canardpc.com/show_oc.php?id=2205097 ) but going ANY higher gives me real issues, mainly 5GHz.

I havent been able to get windows to boot at 5GHz or higher at all (I can get to BIOS at 5.2GHz atleast), considering how low volts I can run 4.8GHz at then it really shouldnt require that much more to run 5GHz.
I have tried the following:
- Lowering memory speed to 1333MHz and upping voltage 1.5V->1.65V and only running with one module
- PLL Voltage upto 1.955V
- VCore upto 5.25V
- VTT upto 1.15V
- BCLK 99MHz-101MHz

None of these helped me boot to Windows, I'm always stuck on the "blinking cursor" on top left corner no matter what settings I tried to get into Windows.

So I had a random though: I ran my previous setup (E6750+ASUS P5K) with same PSU and had similiar~ish issues:
- Overclocked to 3.6GHz without ANY issues, going even one tick higher FSB would result in system not booting at all

Maybe, JUST MAYBE this could be a PSU issue? Currently have Antec Earthwatts (EA500-D) 500W PSU that came with the Sonata II case.
The original owner of the parts said he could boot at 5.4GHz, not that I'm taking his word for it that it would but 1.35V at 4.8GHz and 5GHz wont boot into Windows even at 1.525V?
Sounds a bit fishy to me!
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post #2 of 8
If you have the option to enable CPU PLL Over-Voltage, make sure that is enabled. That is what allows the higher multipliers to boot into windows. Could be your issue. Also, once you have done this, you should be able to readjust your Vcore. My 2600k takes about 1.44v @ 5.0ghz. Mkae sure you keep an eye on your core temps though.

ALSO : DO NOT HAVE CPU PLL Voltage that high. Drop that below 1.89V. Normally, you can run this at stock 1.800V or lower. I run mine at 1.650V with no issues.

I would assume that the CPU Vcore is also a typo. Assuming you mean 1.525v not 5.25v tongue.gif
Edited by Hacksword - 1/18/12 at 2:58pm
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post #3 of 8
Thread Starter 
Quote:
Originally Posted by Hacksword View Post

If you have the option to enable CPU PLL Over-Voltage, make sure that is enabled. That is what allows the higher multipliers to boot into windows. Could be your issue. Also, once you have done this, you should be able to readjust your Vcore. My 2600k takes about 1.44v @ 5.0ghz. Mkae sure you keep an eye on your core temps though.
ALSO : DO NOT HAVE CPU PLL Voltage that high. Drop that below 1.89V. Normally, you can run this at stock 1.800V or lower. I run mine at 1.650V with no issues.
I would assume that the CPU Vcore is also a typo. Assuming you mean 1.525v not 5.25v tongue.gif

Want my sister? Enabled the Over-Voltage and holy ****, http://valid.canardpc.com/show_oc.php?id=2205142
That was just a quick "throw some more volts and 50x multi and see what happens", will do some proper work now and post results soon hopefully smile.gif
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post #4 of 8
Glad I could be of assistance. Make sure that you adjust CPU PLL Voltage down... that high will damage the chip and possibly the RAM I believe :/

Also, welcome to the community. I know you said you have been a long time lurker, but welcome officially smile.gif
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by Hacksword View Post

Glad I could be of assistance. Make sure that you adjust CPU PLL Voltage down... that high will damage the chip and possibly the RAM I believe :/
Also, welcome to the community. I know you said you have been a long time lurker, but welcome officially smile.gif

If I set it on "Auto" it sits at 1.83V even at stock voltage, is 1.86V really that bad?
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post #6 of 8
anything under 1.900v is ok. You should be fine. You can just lower your temps by setting it manually lower. it is trial and error though to find the lower sweet spot.
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post #7 of 8
Thread Starter 
Quote:
Originally Posted by Hacksword View Post

anything under 1.900v is ok. You should be fine. You can just lower your temps by setting it manually lower. it is trial and error though to find the lower sweet spot.

Running 5GHz, 1.41V, 1.668 PLL atm and Prime95 for 30min so far..

Thanks again, propably onto something here thanks to you smile.gif Seems to be a decent CPU after all, wish I just had the money for proper cooling so I could reach 5.2GHz or even 5.4GHz.
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post #8 of 8
Thread Starter 
Dont feel too safe running at 5GHz, temps get too high so guess I'm stuck with 4.8GHz for now anyway smile.gif

Maybe one day with proper watercooling, managed to boot into Windows with 5.4GHz and 1.475V. I can keep dreaming tongue.gif
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Samsung 830 128GB Phobya Custom Water Windows 10 QNIX QX2710 @ 120Hz 
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QPAD MK-50, Blue Switches Rosewill TACHYON 650W Xigmatek Elysium G400 
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