Intel Motherboards - Speedstep does not work on Z97 Killer

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Speedstep does not work on Z97 Killer

Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=1535
Printed Date: 27 May 2024 at 1:55pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Speedstep does not work on Z97 Killer

Posted By: robstl
Subject: Speedstep does not work on Z97 Killer
Date Posted: 16 Dec 2015 at 12:17pm

I have a Z97 Killer with a 4790k. I have it overclocked at 4.8 Ghz (though the speed in this case does not matter). With Speedstep on in the BIOS, CPU-Z and Intel Extreme Tuning Utility never go higher than 4 Ghz even though they both show the multiplier is 48. With Speedstep off, the CPU always runs at 4.8 Ghz, even when the CPU is idle at 2% usage.

I have tried various combinations of settings in the BIOS but I can never get Speedstep to work properly, meaning to clock the CPU down and up as demand dictates.

I don't know if this is related, but I found that Minimum Processor State (and Maximum Processor State) is missing from my Power Options in Windows 7 64-bit. I tried adding them to the registry but the options never appear even though I get the message that the entries were added successfully.