Unlocking 60 FPS in Assassin’s Creed IV: Black Flag Assassin’s Creed IV: Black Flag remains one of the most beloved entries in the franchise, but its PC port is notoriously locked at a 62.5 FPS cap. Even worse, the game’s internal V-Sync often forces the frame rate to drop to 30 FPS if it cannot maintain a consistent 60.

If you are looking to sail the Caribbean with smoother performance, here is the definitive guide on how to unlock and stabilize your frame rate. 1. The Quick Stabilizer: Triple Buffering Fix

The most common issue isn't just the 60 FPS cap, but the "double-buffered" V-Sync that aggressively cuts your frame rate in half. You can fix this without mods by following these steps:

Disable In-Game V-Sync: Go to the game’s graphics settings and turn V-Sync OFF. Force V-Sync via GPU Control Panel: Open your NVIDIA Control Panel or AMD Radeon Settings.

Navigate to Manage 3D Settings > Program Settings and select AC4BFSP.exe. Set Vertical Sync to "On" and enable Triple Buffering.

The "Task Manager" Trick: While the game is running, press Ctrl + Alt + Del to open Task Manager, then simply Alt-Tab back into the game. For many players, this odd legacy bug fix resets the internal frame limiter. 2. High-Refresh Rate Unlock (240 FPS Patch)

For players with 144Hz or 240Hz monitors, the hard 62.5 FPS cap is a major hurdle. A community-made 240 FPS Patch on Nexus Mods is the most reliable way to fully lift the engine's limits.

How to Install: Replace the original AC4BFSP.exe in your game folder with the patched version. Note that this typically only works for legitimate Steam or Ubisoft Connect versions. 3. Essential .ini File Tweaks

You can manually adjust settings by editing the configuration file found in Documents\Assassin's Creed IV Black Flag\Assassin4.ini. Guide :: Making Asassin's Creed IV Black Flag Work in 2020

Here’s a useful post summarizing how to unlock 60 FPS in Assassin’s Creed IV: Black Flag (since the game originally caps at 60 FPS by default on PC — but some need to force it properly, and on consoles it’s different).

For Console (PS4, Xbox One, Switch)

  • No official 60 FPS patch exists.
  • PS4 Pro / Xbox One X still run at ~30 FPS.
  • Xbox Series X|S via backward compatibility → still 30 FPS (no FPS Boost from Microsoft).
  • PS5 → plays PS4 version at 30 FPS.

Only PC can do 60 FPS reliably.

For Uplay Version:

Editing game settings directly might not be straightforward for Uplay versions. However, you can adjust your in-game settings through the Uplay interface.

  1. Launch Uplay: Open Uplay and navigate to the Assassin's Creed: Black Flag game page.

  2. Options: Look for an "Options" or "Settings" menu related to Assassin's Creed: Black Flag.

  3. Graphics Settings: Some games allow you to adjust graphics settings, including potentially unlocking frame rate limits, directly through Uplay.

2. Nvidia Inspector Frame Rate Limiter

Instead of unlimited FPS, lock the game to 72 FPS. The engine tolerates 72 FPS (a 20% increase over 60) without major physics breaks. It is not true "unlocked," but it feels snappier.

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