01.The Memory Limit in Terraria
**tModLoader** is the tool that transforms Terraria into an infinite experience. However, for years, version 1.3.5 was limited to 32-bit, which means the game could only use 4GB of RAM. If you installed giant mods like **Calamity** or **Thorium**, the game would crash with the 'Out of Memory' error. In 2026, we have two different situations depending on the version you play.
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02.1. tModLoader on Steam (Version 1.4+)
Good news for modern players:
Unlike older versions, the tModLoader downloaded directly from Steam for Terraria 1.4 (Journey's End) is already **natively 64-bit**. You do not need to install external patches. If your game is still crashing, the problem is not the bit limit, but rather a lack of physical RAM in your PC. Make sure you have at least 8GB of total system RAM for a smooth experience with many heavy mods in 2026.
03.2. tModLoader 64-bit for Legacy (Version 1.3)
For those using older mods:
If you still play version 1.3 to use mods that haven't been updated:
1. Look for 'tModLoader 64-bit' on GitHub (the tModLoader-64bit repository).
2. Download the .zip file for the version corresponding to yours.
3. Extract and replace the files in the Terraria installation folder.
4. Run the tModLoader64bit.exe file. This will allow Terraria to use 100% of the available RAM on your PC, ending frame drops and crashes.
04.3. Gameplay Optimization
2026 Tip: Even with the 64-bit version, many mods can cause conflicts.
If your FPS is low, try disabling the 'Overhaul' mod or reduce the lighting quality to 'Trippy' in the video settings. This takes the load off the processor, allowing the game to run smoothly even during boss invasions in Survival mode.
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Written by a verified expert
Douglas Felipe M. Gonçalves
Expert in Windows system optimization with years of experience in hardware diagnostics, kernel tuning, and advanced technical support. Founder of Voltris and developer of the Voltris Optimizer.
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By following this guide on tModLoader 64-bit: How to Run Terraria with Many Mods (2026), you are equipped with the verified technical knowledge to solve this issue with confidence.
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