Occasionally, independent programmers release modified .exe files that strip the AVX2 requirement from the engine's initialization checks.
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.
The story of the is a tale of a modern PC port clashing with aging hardware, followed by a swift response from the developer to save the experience for thousands of players. The Barrier: A Technical Gatekeeper
(Advanced Vector Extensions 2) is a set of CPU instructions introduced by Intel with the Haswell architecture in 2013 and by AMD with the Excavator architecture in 2015 (and widely adopted in Ryzen). These instructions allow the CPU to perform mathematical operations on large chunks of data simultaneously (SIMD—Single Instruction, Multiple Data).
Expect severe performance issues (e.g., 5-10 FPS) because instruction set emulation is extremely resource-intensive. 4. Other Potential Fixes (If it's not strictly a CPU issue)
For owners of high-end hardware from the pre-Haswell era (roughly pre-2013 Intel chips, like the beloved Ivy Bridge i7-3770K or early Xeons), the game would crash immediately upon startup. The executable was hard-coded to utilize AVX2 instructions for processing complex mathematical operations efficiently. If the processor didn't speak that specific dialect of code, the program simply had no fallback language. It was a binary gatekeeper: have AVX2, or play nothing.
Use Fix 1 (DLL wrapper). It works for most users, albeit with reduced performance.
If you are playing an older version or need a manual bypass, several community-driven methods exist:
Before you spend three hours tinkering with Intel SDE, ask yourself what CPU you actually have.
If the methods above do not work, it is likely that the processor is too old to handle the modern rendering pipeline of the game.
Because Naughty Dog's engine ties certain audio processing modules to vector extensions, you may notice delayed sound effects or stuttering dialogue during cutscenes.