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Fix | Uncharted 4 Avx2

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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.

Extract the Intel SDE Emulator, create a shortcut of sde.exe , and modify its target properties to point to your game's executable (e.g., sde.exe -hsw -- U4.exe ).

Search for the "Uncharted 4 AVX2 Fix" on reputable modding sites like Nexus Mods or GitHub. Ensure you are downloading the version compatible with the Legacy of Thieves Collection . Step 2: Backup Your Files

The story has a happy ending for most users. On , Iron Galaxy and Naughty Dog released patch 1.3.20812 , which officially removed the mandatory AVX2 restriction.

If you are updated but still experiencing crashes or launch issues, consider these steps:

Intel 4th gen (Haswell) and newer, AMD Ryzen and some late FX. Not supported: Intel Core 2 Duo, 1st–3rd gen Core (i7-9xx, i7-2xxx, i7-3xxx), AMD Phenom, Bulldozer (unless Excavator variant).

🚨 : 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.

: Uncharted 4 was built for the PlayStation 4, which uses a Jaguar CPU that does not support AVX2.

was originally designed for the Jaguar CPU in the PS4 (which also lacks AVX2), the engine isn't inherently "broken" without it; the requirement on PC was largely an optimization choice by Naughty Dog/Iron Galaxy. Frame Times:

Right-click the game > Properties > Installed Files > Verify integrity of game files .

Have you successfully run Uncharted 4 on a Core 2 Quad or AMD Phenom? Share your results in the PC Gaming Wiki forums.

If you want, tell me:

: 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.

| Metric | i7-3770 + Fix | i7-4770K (native AVX2) | Difference | |--------|--------------|----------------------|------------| | Avg FPS | 31.2 | 53.7 | -42% | | 1% low | 22.4 | 41.2 | -46% | | CPU usage (game thread) | 98% | 71% | +27% absolute |