Why does Civilization VII keep tearing during late-game city renders on my Manli Snow Fox RTX 5080 OC?

Once I hit the late game with hundreds of units on screen, I noticed these annoying micro-tears horizontally across the display, and even with V-Sync on, it wouldn't budge. The GDDR7 on the Manli Snow Fox RTX 5080 OC has insane bandwidth, but the memory controller was bouncing erratically between 28-32Gbps during Civ VII's complex render passes. I tried forcing 'Prefer Maximum Performance' in the NVIDIA Control Panel, which gave me a measly 5 FPS boost but actually made the tearing worse—a total nightmare. I eventually used a tuning tool to lock the memory clock at 27.5Gbps and enabled G-Sync Compatible mode on my monitor. Checking the RTSS frame time graph, the wild 12-28ms spikes flattened out to a consistent 14-17ms, and the tearing vanished. I did hit a snag where the game black-screened during turn transitions, but a tiny voltage offset of +0.015V sorted that right out. GPU core stayed between 62-68℃ and VRAM sat at 74-81℃. Frame times are now locked at 14-17ms, and it feels buttery smooth.