How to fix purple texture flickering in Judgment at 4K resolution?

It's ironic that top-tier memory failed here; neon signs on the street flickered into weird purple blocks, which is a disaster at 4K. I first tried disabling all anti-aliasing options, which made the image coarse without reducing the flickering—a complete waste of time. I used the GamePP BIOS Load-Line Voltage Adjustment Wizard to lock VDD at 1.40V and VDDQ at 1.35V per HWInfo. MemTest86 errors dropped to zero, and AIDA64 showed temps at 55-57℃.