Frossed

Thank you for clarifying. I meant leaving PC on for a while while I'm AFK. C states and SpeedStep were enabled. As for problem itself, i did updated BIOS today, and kept everything at stock. Problem seems to be gone now, everything works fine. Probably that underclocking was the issue, Thanks for clearing that up. Cheers mate

Lately I have noticed performance drop when I'm using PC after leaving it for a while in Idle mode. Turns out CPU won't go back to full speed after waking it up from idle, it remains undervolted/underclocked hence performance drop. One option is to keep it at 100% at all time, but i want that power save mode on. CPU is overclocked from 3,6Ghz to 4Ghz, keeping voltage options at auto, it was running stable till now (I'm using it for over a year), but I'm not sure if it's fresh matter. It rarely got chance to be idle, but i slightly changed my day routine now, so PC have more idle time now. Any help solving this would be much appreciated, thanks. specs: Intel i5 8600k@4Ghz ASRock Z370 Extreme4 G.Skill Trident Z 2x8GB DDR4 3200Mhz MSI GTX 1060 6gb gaming x Corsair RM650X Windows 10 Pro I'm using Fractal Define Ctg case with Corsair H100i v2 AIO cooler inside, with 3x120mm corsair SP120L fans mounted on front. Attached pics are showing CPU voltage and speed before and after idle period.