: Open the Nvidia Control Panel , go to "Manage 3D settings" > "Program Settings," select ac4bfsp.exe , and set "Vertical sync" to On or Adaptive .
Unlocking the framerate strips that weight away. Edward Kenway moves with a fluidity that makes navigation a joy rather than a chore. Parkour feels snappier, and the lag between pressing a button and seeing an animation trigger is drastically reduced. When you are leaping from mast to mast in the middle of a storm, the extra frames provide clarity that makes the platforming significantly less frustrating.
Assassin's Creed IV: Black Flag is arguably the pinnacle of the series' golden era, but its PC port is notoriously problematic. Players frequently encounter a (actually 63 FPS) and an archaic double-buffered VSync that plunges the frame rate to 30 FPS if it drops even slightly below 60.
As of early 2026, official support for higher frame rates is as follows: PS5 & Xbox Series X: Black Flag remains locked at on consoles. Rumored Remake:
Method 2: Using RivaTuner Statistics Server (RTSS) for High Refresh Rates assassin 39-s creed black flag 60 fps unlock
Enable (note: while Black Flag uses DirectX 11, forcing driver-level sync tools via Radeon Anti-Lag or Enhanced Sync often yields the same smoothing effect). Launch the game.
Set to Very High (instead of Shadows/PhysX maxed out). This gives the best visual-to-performance ratio.
If you used a mod to unlock FPS and the physics are broken, the mod may not be compatible with your game version. Revert to the original .exe or find a more updated patch.
. While there is no standard in-game toggle to exceed this, you can achieve a stable 60 FPS experience or use third-party mods to push higher at the risk of breaking game physics. Essential Fixes for a Stable 60 FPS : Open the Nvidia Control Panel , go
For those looking to relive the Golden Age of Piracy today, these community-driven fixes remain the only way to get the "Butter-Smooth" experience Edward Kenway deserves. on how to apply the file edits or the Nvidia Control Panel settings for your specific PC?
(optional)
: Use RivaTuner Statistics Server (RTSS) to set a hard limit of 60 FPS or 62 FPS . This provides much more stable frame times than the engine's internal limiter. 3. Critical Performance Tweaks
: You can manually adjust the refresh rate cap by editing the Assassins4.ini file located in your Documents folder. Change the "RefreshRate" and "DisplayableRefreshRate" values to 60 or slightly higher (e.g., 63-65 ) and set "Vsync" to 0 . Parkour feels snappier, and the lag between pressing
Keep RTSS running in the background and launch the game with in-game VSync turned off. Method 3: Editing the D3DOverrider Utility
Assassin’s Creed IV: Black Flag was already a 9/10 game. It had the best setting, the best protagonist, and the best soundtrack in the series. The only thing holding it back from feeling "modern" was the technical limitation of its engine.
Unlocking the frame rate is only half the battle. Black Flag features a few highly unoptimized graphical settings that will cause frame drops on even the most powerful modern rigs. Tweak these specific settings to guarantee your performance stays pinned at 60 FPS: