I'm running into a frustrating issue with my Intel Core Ultra 9 285K (Arrow Lake) on my MSI Z890 motherboard. When I leave everything set to Auto, the CPU boosts perfectly to 5.7GHz, but I see significant voltage spikes reaching 1.56V. To keep things cooler and protect the CPU, I tried setting a manual Vcore Override at 1.445V. However, as soon as I apply any manual voltage, the CPU clocks drop and lock at base 3600MHz and won't boost, even under lighter loads. My setup includes the Core Ultra 9 285K with 24 cores, and I've set various power limits and disabled IA CEP in the BIOS. Temperatures remain well below 80°C during this issue. I'm trying to figure out how to set a voltage ceiling at around 1.45V while maintaining the ability for the CPU to boost to its full potential. Has anyone faced this issue with the Z890 and 285K combo? Is there a hidden setting I should adjust to stop the throttling?
2 Answers
It sounds like you’re experiencing a common issue when switching to manual Vcore override. The system locks the clocks because it's trying to protect itself from potential damage; the override can disrupt the normal turbo boosting behavior. Instead, consider using Adaptive voltage with a slight negative offset. This way, you can limit the voltage without completely locking the frequency. Starting with an offset of around -0.050V to -0.080V could be safer. Set LLC to Level 3 or 4 to help with voltage spikes, and remember to keep IA CEP disabled to maintain stability.
You're likely running into problems with the Override mode itself, which is probably preventing the chip from boosting as intended. Switching to Adaptive voltage with a negative offset is a great way to avoid those spikes while still achieving maximum clock speeds. Additionally, check your ICCMax settings; setting it manually rather than leaving it on Auto might help maintain better control over your current limits when using a fixed voltage. It might take a bit of tweaking, but you'll get there!
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