The definitive fix came from the developers at Naughty Dog and Iron Galaxy. On , they released Patch v1.3.20812 for the Legacy of Thieves Collection .
AVX2 is a set of CPU instructions that helps with high-performance computing, such as complex physics, rendering, and data processing. Uncharted 4 was initially coded to rely heavily on these instructions to handle its high-fidelity graphics and intense action sequences.
stands for Advanced Vector Extensions 2 . In simple terms, it's a specialized set of instructions built into modern CPUs designed to handle complex mathematical calculations more efficiently. While helpful for performance, the problem arises when a game like Uncharted 4 demands this feature. uncharted 4 avx2 fix
Regardless of the technical nuances, the official patch ultimately resolved the issue for most players. It is worth noting that Intel's SDE emulator was originally , not as a long-term solution for end-users. The fact that it was used extensively by gamers highlights the frustration caused by the artificial hardware lockout.
We diffed the original and patched game executables (binary diffing using Diaphora). Identified replaced AVX2 instructions were mapped to equivalent AVX or SSE sequences. CPUID interception via DLL injection was verified. The definitive fix came from the developers at
Newer processors will still use the optimized AVX2 code path. Stability:
If the game still won't launch, right-click the game in your library, go to Properties > Installed Files , and click Verify integrity of game files Manual Launch (Optional): Uncharted 4 was initially coded to rely heavily
After extensive testing by community members on platforms like Reddit (r/OldPCGaming, r/UnchartedPC), GitHub, and the Steam Discussions, two primary fixes have emerged.
This guide explains why Uncharted 4 can crash or fail to launch on some PCs due to AVX2 instruction issues, and gives a clear, step-by-step set of fixes you can try. I assume you’re running the PC version on Windows.
: The patch introduced a clever fix: if an older CPU is detected, the game automatically switches to a fallback executable (like u4-l.exe ) that doesn't require AVX2.