Mine is enabled. Asus Z790-H bios 2703

 

Thank you, but I'm especially interested how this C1E setting is configured by BIOS on non-Asus motherboards.

 

Enabled.

 

Thanks. Can you still toggle it ON and OFF in BIOS, or is C1E setting is blocked and cannot be changed.

 

on MSI I've had that option in bios for many different bios versions including the last one and I always set it to enabled unless I'm testing/experimenting with something that needs all power saving features disabled

 

Can you disable C1E in BIOS on MSI motherboard with microcode 0x12B?

I know Asus enabled C1E in BIOS and blocked it. It looks like for no good reason. I'm curious how it is for other motherboard vendors. Maybe the new microcode 0x12B enforces it or something.

Asus BIOS change log.

1.Updated with Intel microcode 0x12B to address elevated voltage requests during idle or light activity, further mitigating Vmin Shift instability issues.
2.The option to disable C1E in the BIOS has been removed to ensure it remains enabled, reducing processor stress and maintaining stability per Intel's recommendation.

 

I’m on 0x12B and it’s enabled according to HWINFO but no option to disable it in BIOS I remember it being an option in previous BIOS.

 

I can set the setting in bios to disabled, but I don't know if it has any effect. I'm not sure how would I find that out or what to look for

 

You can check it in Windows, just follow these steps.
I suggest downloading a portable version of HWInfo64.

Free Download HWiNFO Sofware | Installer & Portable for Windows, DOS

Start to analyze your hardware right now! HWiNFO has available as an Installer and Portable version for Windows (32/64-bit) and Portable version for DOS.

www.hwinfo.com

It will show "Extended Auto-HALT State C1E" in HWInfo64 Summary screen as disabled if the setting in BIOS actually works. Also your CPU clocks should not throttle to 800MHz during light CPU load.

Steps:
You can check it in Windows using HWInfo64 application.
1. Run HWInfo64 with Summary Screen enabled. That is "Sensor-only" and "Summary-Only" settings are unchecked during HWInfo64 Startup.
2. Go to Summary Screen
3. Click on you PC name and then on CentralProcessor(s), and then on your CPU name.
4. In right panel scroll down to "Enhanced Features" and check value of "Extended Auto-HALT State C1E"

CPU is throtling while C1E is enabled.
If C1E would be enabled on CPU, regardless of BIOS option, it will throttle down Pcores to 800Mhz whenever possible. Like on picture bellows Pcores 2-7.

 

I finally updated the BIOS on my ASRock Z790 PG-ITX/TB4 to 0x12B.

The "CPU C1E State Support" disappeared from the BIOS, HWInfo reports it is enabled.
I had to disable C1E State Support in previous BIOS versions because of terrible mouse stuttering.
With the newest BIOS the system runs complete smooth, not one nitpick to find.
Furthermore it seems that the now by default enabled C1E State Support leads to 1-2 W less power draw in idle.