How to fix core voltage fluctuations on Onda A520-VH-W?
Entering a busy town center felt like the screen was twitching, and this weird choppiness was obvious even at 1080P. The power delivery on this Onda A520 is pretty rough; the core voltage was swinging wildly between 1.1V and 1.3V, triggering constant CPU throttling. I tried the High Performance power plan first, but the CPU just hit 95℃ while the stutters remained—totally disappointing. I went into the BIOS, set a manual CPU voltage offset of +0.05V, and tweaked the fan curve to hit 100% at 70℃. Monitoring showed the voltage swing dropped from 0.2V to 0.06V, and that annoying twitching stopped. I had a bit of a boot delay after the offset change, but disabling Fast Boot sorted it out. CPU now stays at 68-75℃ and VRMs are at 70-78℃. Frame time analysis confirms the drops are gone, with a steady 5.1-6.4ms generation time.