4GB MCTF - Multi-Core Threading Fix, for short

One thing to note: If you have run the game in the past, you could have older ini files that need deleted first. If this is the case, first delete all files in the "documents/mygames/fallout3", all but the save game folder.

Then do the following.

Step One - Set Your Ingame GPU

Go to Windows10 Settings, System, Display, Graphics settings
Click Browse and goto the game folder
C:\Program Files (x86)\GOG Galaxy\Games\Fallout 3
Select the Fallout3.exe

Once selected Fallout3.exe will appear under the "Browse" button.
Select it and click "options", select High performance and save.
(Use the AMD or Nvidia setting if available)
This will set the GPU for you.
You can do the same for any other games you have.

If Just Using an Intel GPU

Goto the following link and download the intel bypass file.
https://www.nexusmods.com/fallout3/mods/17209/?
Use the d3d9.dll only. Place in the game folder.

Try running the game and check it.


Step Two - Add The 4GB Large Address Aware and Multi-Core Threading Fix

Simple Apply the 3 file changes as described in the mod below.
Full information and installation available through the below mod links.

https://www.nexusmods.com/fallout3/mods/21888
or here:
https://www.moddb.com/mods/fallout3-winxp78-multicore-threading-4gb-laa


Step Three - Please restart your system. Run Game Normally.

*Note: For Users with Higher mHz Monitors, if you experience excessive game speeds, also install the excessive speed fix provided on the listed mod from step two.