Why does my Galax B760M D4 Wi-Fi White Phantom keep having massive clock spikes and lag when loading high-res MODs in Cities Skylines?

Once my city population hit 500k with those ultra-high-res building MODs, the screen started twitching in the weirdest way. As someone obsessed with simulation, those unstable frame times were a total nightmare. I pulled up HWiNFO and saw the CPU core voltage on my Galax B760M D4 Wi-Fi White Phantom bouncing wildly between 0.8V and 1.3V, which caused micro-stutters during complex traffic calculations. I first tried enabling 'Ultimate Performance' in Windows, but that was a disaster—temps shot up to 92℃ and the stutters didn't even budge. It's clear that software tweaks can't fix a low-level scheduling conflict. I ended up diving into the BIOS Advanced Power Management, disabled C-State deep sleep, and manually locked the CPU core voltage at 1.25V. Checking RTSS, the frame time variance collapsed from a chaotic 12-15ms to a rock-steady 14-18ms. I did notice some annoying coil whine at idle right after locking the voltage, but that vanished once I set the motherboard load-line calibration to medium. Now, temps sit comfortably between 72-78℃ and the clocks are dead flat. I saved the profile to the BIOS, and the frame delivery is finally smooth at 14-18ms, though the motherboard's VRM still runs a bit warm.