AVX2 is an extension to the x86 instruction set architecture for microprocessors from Intel and AMD. It allows CPUs to execute commands and process data much faster, which game developers use to optimize heavy calculations like physics, AI, and graphics rendering.
: The game now detects if a CPU lacks AVX2 support and automatically switches to a fallback executable. Uncharted 4 uses u4-l.exe for older CPUs. The Lost Legacy uses tll-l.exe for older CPUs.
Mastering the Uncharted 4 AVX2 Fix: How to Play Legacy of Thieves on Older CPUs uncharted 4 avx2 fix
Download the tool from the official Intel Developer website. Extract the archive into a folder on your PC. Open a Command Prompt window inside that folder.
🚨 : Emulation comes at a steep cost. The SDE tool is designed for correctness, not performance . Users have reported that while menus and cinematics may run at 50–60 FPS, actual gameplay often becomes a "20 FPS slideshow" . The CPU is effectively simulating instructions in software, which can result in performance that is 10–100x slower than native execution. This method should be considered a last resort, used only for testing or if you absolutely cannot use the other fixes. AVX2 is an extension to the x86 instruction
Uncharted 4: A Thief’s End (and The Lost Legacy ) requires a processor that supports AVX2 (Advanced Vector Extensions 2). When trying to launch the game on older but still capable CPUs (e.g., early Intel Core i5/i7 from Sandy/Ivy Bridge or some AMD Phenom/Athlon models), the game crashes immediately, often showing an error like:
While these fixes will allow the game to boot past the black screen, you must manage your expectations regarding performance: Uncharted 4 uses u4-l
Early versions of Uncharted: Legacy of Thieves Collection had strict AVX2 requirements. However, according to early community reports 1.2.2 , updates, specifically around Patch 1.3, helped improve compatibility for some users. Verify that Uncharted is updated to the latest version.
Let me know in the comments if the AVX2 DLL wrapper worked for your specific CPU model – user reports help the community keep the fix updated.