April 08, 2016

Ultimate Fallout 4 PC Tweak Guide



If you want pure 60 FPS on your not-so-mainstream PC, this guide may come in handy. A Reddit user tiltilltells made a useful tweak guide on how to make your Fallout 4 run a steady 60 FPS based on his PC build which is pretty much solid; AMD FX-8350 @ 4.2 GHz, EVGA GTX 770 4GB, 8 GB RAM, on the 1080p 60Hz monitor.

To put it in tiltilltrlls' words; "After making the described changes, my game experience has been infinitely better. Buttery smooth 60 FPS. No micro stutter. Nice FOV. Life's good".

There are a couple of things you will have to do in order to improve overall Fallout 4's performance, like making changes in Fallout 4 Launcher Settings, Fallout4.ini, and Fallout4Prefs.ini changes. So let's get down with it.

Modded Fallout 4, image courtesy of Vault-Tec Inc.

Fallout 4 Launcher Settings


The settings described below may or may not be the best possible settings for your rig and are subject to taste. Shadow Distance and Godrays Quality, are absolute FPS killers for most machines, so turn these down to Medium and Low respectively. You will notice a slight difference in image quality as far as shadows go, but it was well worth the ~15 frames.

Setting Value
Antialiasing TAA
Anisotropic Filtering 16x
Texture Quality Ultra
Shadow Quality Medium
Shadow Distance Medium
Decal Quantity Ultra
Lighting Quality High
Godrays Quality Low
Depth of Field Bokeh
Ambient Occulsion SSAO
Screen Space Reflections On
Wetness On
Rain Occulsion On
Motion Blur Off
Lens Flare Off

Fallout4.ini Changes


Search for the following settings in the Fallout4.ini file located in Documents/My Games/Fallout4. If they already exist, change them to the values below. If they do not exist, create them under the appropriate section.

[General]
bMouseAcceleration=0
uInterior Cell Buffer=12
uExterior Cell Buffer=144
bUseThreadedBlood=1
bUseThreadedMorpher=1
bUseThreadedTempEffects=1
bUseThreadedParticleSystem=1
bUseThreadedAI=1
bUseMultiThreadedFaceGen=1
bUseMultiThreadedTrees=1
iNumHWThreads=8*
iPreloadSizeLimit=262144000
iFPSClamp=60***

[Display]
fDefaultWorldFOV=90
fDefault1stPersonFOV=90
iPresentInterval=0
bForceIgnoreSmoothness=1

[Controls]
bMouseAcceleration=0
fMouseHeadingYScale=.03738**

ASTERISK LEGEND (it may require a value adjustment based on your hardware);

* iNumHWThreads is the number of threads your CPU uses.
** fMouseHeadingYScale changes based on the aspect ratio of your monitor;
  • 16:9 use .03738
  • 16:10 use .0336
  • 4:3 use 0.28
  • 21:9 use 0.42
*** This setting is volatile. It can be GREAT if your rig is powerful enough to maintain 60 FPS at virtually all times. However, if you get frequent frame dips, leave this one out altogether as it can cause weird issues.

Red Rocket Truck Stop, image courtesy of Vault-Tec Inc.

Fallout4Prefs.ini Changes


Search for the following settings in the Fallout4Prefs.ini file located in Documents/My Games/Fallout4. If they already exist, change them to the values below. If they do not exist, create them under the appropriate section.

[Display]
fDefaultWorldFOV=90
fDefault1stPersonFOV=90
iPresentInterval=0
bForceIgnoreSmoothness=1

It is well known that the Bethesda games act weird if you go much over 60 FPS, so use a 3rd party tool or the NVIDIA/AMD Control Panel to enable VSYNC or turn on a frame limiter.

As usual, all the normal legal speak applies. Try at your own risk, etc. Shoutout to all the Redditors and others around the web who posted possible tweaks and fixes, and mostly to the tiltilltells for his original Ultimate Fallout 4 PC Tweak Guide post on Reddit.

Since this post is all about Fallout 4 Tweaks, post your findings in the comments below!


Fallout 1, 2 Tactics, Fallout 3, Fallout: New Vegas, Fallout 4