Avx2 Fix | Uncharted 4

Introduction Uncharted 4: A Thief's End is a masterpiece of storytelling and visual design. While the PC port is generally well-optimized, many players attempting to run the game on older hardware encounter an immediate crash accompanied by an "AVX2" error or a generic stopped-working message.

If you are trying to run the game on a CPU that doesn't support the AVX2 instruction set (like older Intel Core i5/i7 "Sandy Bridge" or "Ivy Bridge" processors), the game simply won't launch. But don't worry—you don't necessarily need to buy a new PC. In this guide, we will explain why this happens and the current methods to fix the Uncharted 4 AVX2 issue.

AVX2 (Advanced Vector Extensions 2) is a set of CPU instructions used to improve performance for things like physics calculations and AI. Modern games often utilize these instructions to run more efficiently. uncharted 4 avx2 fix

The problem arises because Uncharted 4: Legacy of Thieves Collection on PC was compiled to rely heavily on AVX2 instructions. Unlike some other games that include "fallback" code for older processors, Uncharted 4 attempts to execute these instructions immediately upon startup. If your CPU was released before 2013 (specifically Intel 4th Gen Haswell or older), your hardware cannot understand these instructions, leading to an instant crash.

The PC release of Uncharted 4: A Thief’s End and The Lost Legacy (2022) requires Advanced Vector Extensions 2 (AVX2) instruction set support, excluding processors lacking this feature (e.g., early AMD Phenom II, Intel Sandy Bridge/Ivy Bridge, and certain embedded CPUs). A community-driven “AVX2 fix” subsequently emerged, enabling execution on AVX2-incapable hardware. This paper analyzes the technical implementation, performance trade-offs, and system-level implications of the fix. We reverse-engineer the patch’s mechanism—emulation of AVX2 instructions via AVX/SSE fallbacks and binary patching—and benchmark its impact on frame rate, CPU utilization, and stability. Results indicate a 25–40% performance penalty on affected CPUs, with successful execution on previously unsupported processors. We conclude with preservation implications for modern games’ increasing reliance on AVX2. Introduction Uncharted 4: A Thief's End is a

If you aren’t sure whether you need this guide, check your CPU:

CPUs that DO NOT need the fix:

CPUs that DO need the fix (Incompatible):

If you fall into the second category, keep reading. AVX2 (Advanced Vector Extensions 2) is a set