This component shows unusual behavior after being overvolted.
This component shows unusual behavior after being overvolted.
You're experimenting with different BIOS settings to lower your voltage on the 12900k. It sounds like you're trying to balance performance and stability. The results with XTU seem promising, offering a noticeable drop in temperature and power usage without a big hit in scores. However, when you switch back to default or enable offset mode in your BIOS, things get unpredictable—scores drop sharply while temps stay high or even rise slightly. This could be due to how the CPU handles voltage adjustments under stress. It might help to test with only one setting at a time and monitor both performance and thermal metrics closely.
That's accurate. I restored the XTU offset to zero prior to making any changes in BIOS.
Large drops in Cinebench results are frequently encountered when attempting to undervolt components. I believe Intel Undervolt Protection is often the source of this issue. Although you may have turned it off in the BIOS, it’s possible the setting isn’t functioning properly. Consider running ThrottleStop 9.6 at https://www.techpowerup.com/download/tec...rottlestop. Access the FIVR window and check if Undervolt Protection appears enabled. Many users notice their CPU maintains the same speed after undervolting, which can lead to an unexpected performance drop. I’ve observed some 13600K models where Cinebench scores halve or more when trying to undervolt. If this issue isn’t linked to Undervolt Protection, it likely stems from a different CPU flaw. Intel appears unwilling to address this problem, labeling it as a design defect. Using Intel XTU or ThrottleStop for undervolting works reliably and doesn’t trigger this performance loss. Always run Cinebench tests after changing BIOS voltage settings. This advice applies to any Intel 12th Gen or newer processor.
I only located one recorded setting for undervolt protection on my BIOS/motherboard, and it’s definitely turned off. I also installed ThrottleStop, verified the FIVR window, and based on that, it seems no undervolt protection is active. However, according to your advice, this appears to be a BIOS issue. Since you’re using the latest BIOS and the board is mid-to-high end, Intel/MSI should have addressed this if they wanted to. They seem reluctant to fix it or even consider it a deliberate flaw. XTU functions, but I prefer a plug-and-play setup without relying on software. What should I do next? If this is indeed a BIOS bug and they won’t update it, it might be best to accept the limitation. I’m confused because modern CPUs don’t show any voltage differences in HWInfo64 or similar tools, regardless of adjustments. Are there hidden settings—like AI or turbo controls—that could interfere with undervolting?
Another option is Intel Current Excursion Protection. Undervolting can lower current and activate CEP, which then decreases performance. Look into your BIOS to verify if IA-CEP is available. Turn it off if possible. Intel treats this as a built-in feature and has no intention of releasing a fix. They don’t plan to address the problem. This is their solution for earlier Plundervolt concerns. More details can be found here: https://www.techpowerup.com/forums/threa...st-4917837. If BIOS-based undervolting fails to maintain performance, consider using Intel XTU, ThrottleStop, or simply accept a running CPU. Your Asus BIOS includes SVID Support—check for similar settings. It might help if enabled properly. It’s interesting how few people discuss this issue.
I turned off IA-CEP and it resolved some problems I faced. The voltage appears to be fluctuating now. In BIOS I reached an undervolt of -0.110 but had to set LLC to 7 because crashes occurred. Several videos suggested adjusting it for better stability. It’s not perfectly matching the temperatures/voltage XTU was getting, but it’s close and successfully achieving an undervolt is a relief. Thanks for your assistance!