GTA IV RTX Remix 1.1.5: Complete Breakdown of All Fixes, Performance Tips & Installation Guide

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While the gaming world turns its eyes to the sun-drenched promise of Vice City, a quieter revolution is reshaping a classic. The GTA IV RTX Remix mod transformed Liberty City into a path-traced marvel, bringing unprecedented visual realism to Niko Bellic's gritty story.

With Update 1.1.5, the mod receives surgical polish rather than flashy new features. Every raindrop, reflection, and taxi hood glint has been fine-tuned to enhance immersion. This guide walks through all the fixes, installation steps, and performance tweaks so both newcomers and veteran modders can experience Liberty City at its absolute best.

What Is the GTA IV RTX Remix Mod?

GTA IV RTX Remix 1.1.5: All Fixes, Performance Tips & Installation Guide

Before diving into the 1.1.5 fixes, it’s crucial to understand what this mod is—and isn’t.

What It Does:

  • Bridges NVIDIA RTX Remix to GTA IV’s old engine, unlocking real-time path tracing.

  • Simulates light behavior realistically: accurate shadows, global illumination, and reflections from every source.

What It Does NOT Do:

  • No new high-resolution textures or 3D models are included.

  • It provides a lighting foundation, letting community-made assets shine under RTX.

Hardware Requirements:

  • GPU: RTX 4070 or better recommended.

  • CPU: Modern, high-end CPU to manage GTA IV’s geometry and avoid CPU bottlenecks.

Update 1.1.5: The Complete Fix List

CategorySpecific Issues Addressed
Visual & Texture PolishFixed in-game meshes & glass. Corrected "bergen wood" textures (docks) & improved taxi metal surfaces.
Weather & Rain OverhaulUpdated rain particle effects, decreased collision thickness, fixed rain restart bug, corrected “disable raindrop” on translucent windows.
User Configuration & ControlAdded ability to disable projected light coronas & unhide locked textures via rtx.conf.
Interface & StabilityImproved in-game ImGui menu layout, tagged more decal textures for proper rendering.

The Essential Guide: Installation & Configuration

Step 1: Preparation

  • Ensure you own GTA IV: The Complete Edition v1.2.0.59 on Steam or Rockstar Launcher.

  • Download the mod only from the official source to avoid corrupted files.

Step 2: Critical Installation

  • Run the installer and accept the custom FusionFix fork. Skipping this causes crashes.

  • FusionFix is a crucial community patch adapted for RTX Remix compatibility.

Step 3: Launching for Best Performance

  • Do not launch via Steam.

  • Use the batch file: _LaunchWithProcessorAffinity_Half_GTA4__Half_Remix.bat to split the workload across CPU cores, reducing stuttering.

Step 4: In-Game Controls

  • Alt + X → RTX Remix menu (path tracing, DLSS/XeSS, core visuals).

  • F4 → Compatibility Mod menu (game-specific fixes, performance toggles, advanced tweaks).

Mastering Performance: Essential Tweaks

CPU Bottleneck Reality

  • GTA IV is CPU-heavy; your GPU may not reach 99% usage.

  • Reduce CPU load for smoother gameplay.

Key Fixes

  • View & Detail Distance: Set to 30 and 40 in GTA IV’s original display settings.

  • F4 Menu Tweaks: Increase “Tree Alpha Cutout Value” (~160) for faster distant foliage rendering.

  • AMD Users: Select XeSS in Alt + X menu for best balance of performance and quality.

Conclusion: Why Update 1.1.5 Matters

Update 1.1.5 isn’t about flashy additions—it’s about refinement.

  • Rain looks natural.

  • Textures & reflections behave correctly.

  • Users gain greater control over their experience.

For existing RTX Remix users, this is an essential update. For newcomers, it’s the most polished and approachable entry point yet. Liberty City has never looked—or performed—better. With careful tweaks and community-made assets, Niko Bellic’s story continues in a city that feels alive, dynamic, and breathtakingly real.     

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