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How to properly set the bios for Haswell C states?

Alex780
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Hi!

 

I recently got an msi z87 gd65 and a 4670k and I was wondering how to take advantage of the deep C states Haswell provides.

As they are disabled by default, I tried to activate them in the bios but I got a bsod.

I set

"Intel C-state"  Enabled (Auto by default)

"C1E support" Enabled (Disabled by default)

"Package C-state limit" C7s (Auto by default)

 

It went back to the default settings automatically after my pc crashed.

 

How should I set these options to get it work properly?

I have a Cooler Master V850 (listed as compatible with Haswell) and my system currently idles at 0.7 volts.

 

Thanks for your help!

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Try updating your BIOS before enabling those extra C states.

"It pays to keep an open mind, but not so open your brain falls out." - Carl Sagan.

"I can explain it to you, but I can't understand it for you" - Edward I. Koch

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I have a Cooler Master V850 (listed as compatible with Haswell) and my system currently idles at 0.7 volts.

 

Thanks for your help!

your c states are working fine if your cpu drops down to 800-1200MHz while idle and your voltage drops to .7V as well

 

everything is working properlly.

Mainboard Asrock Z170 OCF CPU 6700k RAM Tridentz 3600 HDD Intel 730 240gb GPU GTX 780ti sc acx PSU Silverstone Strider 1200W  Case Antec 900 Laptop Lenovo Thinkpad T520 build log-   http://linustechtips.com/main/topic/35809-antec-900-the-re-birth-of-a-legend/ Check out the Tech Center https://www.youtube.com/user/prokon24/videos LTT's Unicore King

 

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1glu.png
 

Mainboard Asrock Z170 OCF CPU 6700k RAM Tridentz 3600 HDD Intel 730 240gb GPU GTX 780ti sc acx PSU Silverstone Strider 1200W  Case Antec 900 Laptop Lenovo Thinkpad T520 build log-   http://linustechtips.com/main/topic/35809-antec-900-the-re-birth-of-a-legend/ Check out the Tech Center https://www.youtube.com/user/prokon24/videos LTT's Unicore King

 

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your c states are working fine if your cpu drops down to 800-1200MHz while idle and your voltage drops to .7V as well

 

everything is working properlly.

He wants the deeper ones. Not the ones enabled by default. Motherboard manufacturers disable them by default for maximum compatibility.

"It pays to keep an open mind, but not so open your brain falls out." - Carl Sagan.

"I can explain it to you, but I can't understand it for you" - Edward I. Koch

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Also, is your power supply even compatible with Haswell's extra C states?

"It pays to keep an open mind, but not so open your brain falls out." - Carl Sagan.

"I can explain it to you, but I can't understand it for you" - Edward I. Koch

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He wants the deeper ones. Not the ones enabled by default. Motherboard manufacturers disable them by default for maximum compatibility.

 sorry they dont go any deeper than that while idle.

 

800MHz at 0.7V is the best your gonna get with a haswell chip at idle.

Mainboard Asrock Z170 OCF CPU 6700k RAM Tridentz 3600 HDD Intel 730 240gb GPU GTX 780ti sc acx PSU Silverstone Strider 1200W  Case Antec 900 Laptop Lenovo Thinkpad T520 build log-   http://linustechtips.com/main/topic/35809-antec-900-the-re-birth-of-a-legend/ Check out the Tech Center https://www.youtube.com/user/prokon24/videos LTT's Unicore King

 

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Also, is your power supply even compatible with Haswell's extra C states?

i have a 8 year old power supply that is compitable with the new C-states.

Mainboard Asrock Z170 OCF CPU 6700k RAM Tridentz 3600 HDD Intel 730 240gb GPU GTX 780ti sc acx PSU Silverstone Strider 1200W  Case Antec 900 Laptop Lenovo Thinkpad T520 build log-   http://linustechtips.com/main/topic/35809-antec-900-the-re-birth-of-a-legend/ Check out the Tech Center https://www.youtube.com/user/prokon24/videos LTT's Unicore King

 

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Not all are.

"It pays to keep an open mind, but not so open your brain falls out." - Carl Sagan.

"I can explain it to you, but I can't understand it for you" - Edward I. Koch

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Not all are.

 ya thats what all the hype is after you watch a bunch of tech videos on youtube, just like reviewers mentioning haswell has a hard time running high frequency memory whith an aggresive overclock.

 

from the real world results i have seen (including my own) most people are able to fully  utilize the haswell c states with older power supplies.

 

the big question is " will your computer resume from sleep"

 

if the answer is "no"

 

you may have a psu compatibility issue.

Mainboard Asrock Z170 OCF CPU 6700k RAM Tridentz 3600 HDD Intel 730 240gb GPU GTX 780ti sc acx PSU Silverstone Strider 1200W  Case Antec 900 Laptop Lenovo Thinkpad T520 build log-   http://linustechtips.com/main/topic/35809-antec-900-the-re-birth-of-a-legend/ Check out the Tech Center https://www.youtube.com/user/prokon24/videos LTT's Unicore King

 

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I thought Haswell cpus could idle near 0.0V...

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I thought Haswell cpus could idle near 0.0V...

im not sure where you got that info. not true, sorry.

Mainboard Asrock Z170 OCF CPU 6700k RAM Tridentz 3600 HDD Intel 730 240gb GPU GTX 780ti sc acx PSU Silverstone Strider 1200W  Case Antec 900 Laptop Lenovo Thinkpad T520 build log-   http://linustechtips.com/main/topic/35809-antec-900-the-re-birth-of-a-legend/ Check out the Tech Center https://www.youtube.com/user/prokon24/videos LTT's Unicore King

 

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I've seen such a thing on a few cpu z screenshots. Cpu z could also be wrong. It happens sometimes.

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I thought Haswell cpus could idle near 0.0V. I've seen such a thing on a few cpu z screenshots. It could also just be a voltage misreading....

yep voltage misreading.

 

cpuz has not displayed the proper voltage on my haswell cpu.

 

use the ietu to montior your vitals accuratley

 

http://www.intel.com/content/www/us/en/motherboards/desktop-motherboards/desktop-boards-software-extreme-tuning-utility.html

Mainboard Asrock Z170 OCF CPU 6700k RAM Tridentz 3600 HDD Intel 730 240gb GPU GTX 780ti sc acx PSU Silverstone Strider 1200W  Case Antec 900 Laptop Lenovo Thinkpad T520 build log-   http://linustechtips.com/main/topic/35809-antec-900-the-re-birth-of-a-legend/ Check out the Tech Center https://www.youtube.com/user/prokon24/videos LTT's Unicore King

 

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I've also heard about aida64. Is it accurate?

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I've also heard about aida64. Is it accurate?

for me aida64 is accurate, however if you are using aida64 to stress test it WILL increase your cpu vcore voltage if your vcore parameters are set to "auto"

 

just use the ietu to monitor and to stress test, trust me it will eliminate alot of headaches and confusion.

Mainboard Asrock Z170 OCF CPU 6700k RAM Tridentz 3600 HDD Intel 730 240gb GPU GTX 780ti sc acx PSU Silverstone Strider 1200W  Case Antec 900 Laptop Lenovo Thinkpad T520 build log-   http://linustechtips.com/main/topic/35809-antec-900-the-re-birth-of-a-legend/ Check out the Tech Center https://www.youtube.com/user/prokon24/videos LTT's Unicore King

 

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