AMD Motherboards - B650i Lightning WiFi unable to set cTDP in BIOS

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B650i Lightning WiFi unable to set cTDP in BIOS

Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=29598
Printed Date: 23 Jul 2025 at 2:41pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: B650i Lightning WiFi unable to set cTDP in BIOS

Posted By: charango
Subject: B650i Lightning WiFi unable to set cTDP in BIOS
Date Posted: 17 Feb 2024 at 11:58pm

M/b: B650i Lightning WiFi
BIOS versions: 2.02, 2.08.AS01
CPU: Ryzen 8700g

In BIOS, under Advanced > AMD CBS > SMU common options,
No matter which settings I change, they reset to Auto after a restart.

For example, when changing "System Configuration" to 45W, there is seemingly no effect.
If I try to set SPL/PPT to Manual, they reset to Auto as well.

What could my issue be?

It looks like someone could change those values, e.g.
https://www.phoronix.com/review/ryzen-8000g-35w-45w" rel="nofollow - https://www.phoronix.com/review/ryzen-8000g-35w-45w

Replies:

Posted By: charango
Date Posted: 25 Feb 2024 at 11:53pm

The issue fixed itself by switching DDR5 to the default 4800 frequency.

Not sure why the BIOS wouldn't store the power settings when using an XMP profile.