Euro Truck Simulator 2: Best config.cfg for Multi-Monitor Sim

The key to a high-end sim rig is setting r_multimon_mode to 4. This unlocks the separate multimon_config.sii file, which allows you to define each monitor’s exact FOV, heading offset, and physical angle.

File Path

The configuration file is located in the root of your ETS2 documents folder.

%USERPROFILE%\Documents\Euro Truck Simulator 2\config.cfg

Technical Note: Before editing, ensure your GPU is set to a “Virtual Resolution” (NVIDIA Surround or AMD Eyefinity) that covers all screens. For three 1080p monitors, this would be 5760×1080.

Optimized “Triple Screen” Configuration Block

Search for these specific lines in your config.cfg. This configuration targets frame-time stability across the massive pixel count of a multi-monitor setup.

Parameter	Recommended Value	Technical Purpose
r_multimon_mode	4	Custom Mode. Allows for individual monitor correction in multimon_config.sii.
r_buffer_page_size	30	Anti-Stutter. Increases memory pool for asset streaming; critical for high-res.
g_menu_aa_limit	0	Disables AA in menus to save resources for the 3D world.
r_sun_shadow_texture_size	4096	High-res shadows for clear interior/dash silhouettes across screens.
uset r_deferred_mirrors	1	Optimized mirror rendering for 2026’s DX11/12 hybrid builds.

# Edit these lines in config.cfg
uset r_multimon_mode "4"
uset r_buffer_page_size "30"
uset r_mode_width "5760"  # Set to your total combined width
uset r_mode_height "1080" # Set to your native monitor height
uset r_fullscreen "1"
uset g_bloom "0"          # Bloom can look "smeary" on wide setups
uset r_nv_surround "1"    # If using NVIDIA Surround

HowTo: Engineering the Perfect Monitor Alignment

Follow these GameEngineer.net steps to eliminate the “warped” look on your side monitors:

1. Generate the Multimon Config: After setting r_multimon_mode to 4, launch and exit the game. A new file named multimon_config.sii will appear in the same folder.
2. Angle Correction: In multimon_config.sii, look for the heading_offset value for your side monitors. If your monitors are angled at 45°, set the left monitor to 45.0 and the right to -45.0.
3. Bezel Correction: To stop the image from skipping over your monitor frames, adjust horizontal_fov_relative_offset. A value of 0.03 is a good starting point for 10mm bezels.
4. The “UI” Fix: By default, the game UI (GPS, Menu) will stretch across all three screens. In multimon_config.sii, set normalized_ui_width to 0.333 to force the UI onto only the center monitor.
5. Scaling Balance: On triple-monitor setups, do not exceed 200% Scaling. Rendering 5760×1080 at 400% scaling is equivalent to rendering 16K resolution, which will crush even a RTX 4090/5090. Use TAA (introduced in modern 1.50+ versions) for smoothness instead.

Technical Explanation: Multimon Mode 2 vs. Mode 4

While r_multimon_mode "2" is a quick triple-screen setup, it uses a fixed logic that assumes your monitors are flat. Mode 4 is the “Engineer’s Choice” because it treats each monitor as a separate camera projection ($C_1, C_2, C_3$).

This means the engine calculates the perspective projection matrix for each screen individually based on your specified angles. This removes the “stretching” on the outer edges of your vision. When combined with r_buffer_page_size "30", the engine allocates more “scratchpad” RAM to store the vertex data for these three separate views, reducing the micro-stuttering that occurs when driving into high-density assets like the Port of Rotterdam or London.