https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Wed, 13 May 2026 00:02:50 +0000 Fri, 10 May 2024 09:14:23 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=37709 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=37709&PID=120197&title=13600k-z790m-cpu-is-limited-to-4000mhz-whypound#120197 Author: xtraco
Subject: 37709
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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