Why does RDR2 crash in Saint Denis with Vastarmor RX 9070 XT Super Alloy?

Riding through the busy streets of Saint Denis, the game would freeze and crash instantly, which was incredibly frustrating. I tried lowering texture quality to 'High', which stopped the crashes but introduced ugly pixelation on distant buildings. I used GamePP Memory Controller Load Monitor to set VRAM scheduling priority to highest and optimized virtual memory alignment. AIDA64 confirmed VRAM bandwidth utilization rose to 88-92%, while core temperature stayed 68-74℃ per HWMonitor.