13600K + Z790M = CPU is limited to 4000MHz, Why£
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=37709
Printed Date: 27 Dec 2024 at 7:13am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: 13600K + Z790M = CPU is limited to 4000MHz, Why£
Posted By: xtraco
Subject: 13600K + Z790M = CPU is limited to 4000MHz, Why£
Date Posted: 10 May 2024 at 9:14am
Hello, because of stability issues I've got in default BIOS configuration (after 1 yr of normal work) I'm trying to run my setup in fixed-frequency config.
In BIOS I disabled 'Intel SpeedStep Technology' and 'Intel Speed Shift Technology', it looks like system runs perfectly OK, but BIOS limits final CPU frequency to 4000Mhz.
For example:
1. Working configuration: BCLK = 121, CPU multiplier x33 - CPU frequency = 121 * 33 = 3993Mhz
2. I increment BCLK, expect to get 122 * 33 = 4096Mhz, but in Windows I see CPU multiplier is set to 32 (not 33) and actual frequency is around 122 * 32 = 3900Mhz
It seems like value of "OC Tweaker / CPU Configuration / CPU P-Core Ratio" is ignored if final CPU frequency goes above 4000Mhz.
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Question: Which BOIS configuration options I need to set to get CPU base clock higher than 4000Mhz?
(I expect CPU may run stably at frequencies up to 5000Mhz.)
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Motherboard: ASRock Z790M PG Lightning/D4, BIOS: 11.02
CPU: i5-13600K
Memory: G.Skill F4-4400
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