: Ensure your game is updated to at least Version 1.3.20812 or later.
Navigate to your local AppData folder ( C:\Users\YourUsername\AppData\Local\Uncharted Legacy of Thieves Collection ) and clear the cache or shader cache folder. Increase Virtual Memory (Pagefile): Search for "Advanced System Settings" in Windows. Under the Advanced tab, click Settings under Performance.
[Uncharted 4 Launcher] │ ├──► Detects AVX2 Support ──► Launches: u4.exe / tll.exe (Max Performance) │ └──► No AVX2 Detected ──► Switches to: u4-l.exe / tll-l.exe (Fallback Executable) How the New Fallback System Works uncharted 4 avx2 fix new
The update seamlessly bypasses the hardware lock through a built-in automated system:
Initial community concerns suggested that removing AVX2 requirements would result in massive performance penalties. Real-world benchmarks on older hardware reveal surprising results: Hardware Metric Standard Executable (AVX2) Fallback Executable ( -l.exe ) Variable baseline Comparable to minor (1–3%) margin Frame Pacing Smooth on modern CPUs Occasional micro-stutters during heavy action CPU Thermals Normal workload Normal workload (no emulation overhead) Stability Stable after full shader compilation : Ensure your game is updated to at least Version 1
: This method is an emulation layer and typically results in extremely poor performance, often described as a "20 FPS slideshow". Minimum System Requirements Refresher
When Uncharted: Legacy of Thieves Collection was released, it required AVX2 support to run. This meant that CPUs without AVX2—including many Intel Sandy Bridge, Ivy Bridge processors, and older Xeon server chips—were locked out of the game entirely, unable to launch the executable. Under the Advanced tab, click Settings under Performance
1st, 2nd, and 3rd Generation Intel Core CPUs (e.g., Sandy Bridge and Ivy Bridge architectures like the legendary i7-2600K or i7-3770K).
: Ensure you are running NVIDIA driver 526.98 or higher, as older drivers were known to cause crashes during launch on some hardware configurations.
: If the game detects an older CPU missing the AVX2 instruction set, it transparently routes the game launch through a fallback executable: u4-l.exe for Uncharted 4: A Thief's End . tll-l.exe for Uncharted: The Lost Legacy .
While the game is now playable on older CPUs, reviewers have noted that performance is generally better when the game is GPU-bound, though some users report a smooth experience even on decade-old processors. How to Apply the Fix Update via Steam/Epic: