Save the file, right-click it, select , check Read-only , and click Apply . (This prevents the game from overwriting your changes). Method 3: Using Third-Party Tools (D3DOverrider)
The most popular and reliable solution is the 240 FPS Patch by Kamzik123 , available on Nexus Mods. While originally made to raise the cap to 240 FPS, the patch also includes an unlock for the fog rendering and a 4GB patch, making it the all-in-one solution for modern systems.
Do not use "FPS unlocker" executables from random forums. Use the AC4 Fleet Pack or the D3D11 Wrapper method . As of 2025, the most trusted source is the Nexus Mods page: "Black Flag True 144Hz Fix."
This is the most reliable method. It forces the game to run at 60 FPS while using hardware-level triple buffering to eliminate screen tearing. Step 1: Modify the In-Game Settings Launch . Navigate to Options > Graphics Settings . Turn VSync OFF . assassin 39-s creed black flag 60 fps unlock
The Assassin’s Creed IV: Black Flag 60 FPS unlock represents a new form of user-led software maintenance. When developers abandon legacy titles with technical debt, modding communities fill the preservation gap. This case suggests that game companies should either open-source older engines or provide official performance patches—otherwise, reverse engineering becomes the only viable path to playability.
Click in the top right if Black Flag is missing, then select the game executable. Find Wait for Vertical Refresh and set it to Always on .
Right-click the AssassinBlackFlag.ini file and open it with . Save the file, right-click it, select , check
Using a 144Hz or 240Hz monitor with a 60 FPS cap can sometimes cause ghosting or tearing. Method 1: The "240 FPS Patch" (.exe Replacement)
Avoid TXAA . Use SMAA or force FXAA through your GPU control panel for a crisp image without a massive performance tax.
(Note: You may need to right-click the file, select Properties, and check "Read-only" to prevent the game from overwriting your changes at startup). Additional Optimization Tips for High Frame Rates While originally made to raise the cap to
The game will automatically expand into a seamless, borderless window running at a smooth 60 FPS. Method 3: Force Triple Buffering via D3DOverrider
If you are running a high-refresh-rate monitor and a modern graphics card, playing at a choppy frame rate ruins the experience. Fortunately, you can bypass these engine limitations. This guide provides the exact steps to unlock a smooth, stable 60 FPS (or higher) in Assassin's Creed Black Flag. Why is Black Flag Locked at 30 FPS?