Even with the AVX2 fix, older processors may struggle with stability. If the game still crashes, try these community-verified steps: UNCHARTED - AVX2 fixed on old CPUs - Steam Community
The game's executable utilizes AVX2 instructions (part of the AVX-256 family) to optimize vector processing. These instructions operate on 256-bit registers (YMM0–YMM15). uncharted+4+avx2+fix+free
Memory Freeing / Lifetime Management