The GTA IV RTX Remix Compatibility Mod, developed by modder xoxor4d, is a groundbreaking modification that brings full NVIDIA RTX Remix support to Grand Theft Auto IV: The Complete Edition (version 1.2.0.59), enabling real-time path tracing with accurate global illumination, shadows from all light sources including the sun, dynamic emissive surfaces on vehicles, buildings, and shops, realistic light bounce and occlusion, and path-traced reflections on suitable surfaces. Released publicly on November 28, 2025, via GitHub the mod includes a dedicated installer, a custom Remix runtime, and compatibility with the popular FusionFix mod through a tailored fork to fix bugs and add features like FOV sliders and FPS limits. This is not a full remaster with new high-res textures or models but a compatibility layer that unlocks RTX Remix’s potential, allowing community modders to add PBR materials, higher-poly assets, and instanced vegetation while preserving the game’s original art direction enhanced by modern lighting.
Key features include cascaded anti-culling for static objects (still WIP), translation of all game lights to Remix lights with override options, separate vehicle headlights and taillights, dynamic wetness effects with raindrops on angled surfaces, working vehicle dirt and liveries, mobile phone UI that scales with FOV, modified vertex shaders for surface normals, screenshot and FreeCam modes, and tweakable in-game menus—RTX Remix settings via Alt+X and mod options via F4. Recent updates in testing builds like 0.8.4 fixed HUD scaling with auto-resolution detection, black sky issues during phone use, capture crashes, and light noise; 0.8.3 added RemixApi light capture (WIP, may crash), backface culling fixes for problematic meshes, and VRAM optimizations by uploading only colormaps; earlier versions improved phone UI, decal blending, blood decals, and added processor affinity launchers to split CPU cores between the game and Remix bridge for reduced stuttering.
Performance is demanding due to RTX Remix’s draw call overhead and GTA IV’s inherent CPU bottlenecks from dense meshes, even without path tracing; on an RTX 5080 at 4K, base path tracing yields 35-45 FPS with DLSS 4 Performance, rising to 55-85 FPS with Frame Generation and up to 100 FPS with MFG x3, but dense areas remain CPU-limited on high-end rigs like i7-14700F. Recommendations include launching with _LaunchWithProcessorAffinity_2Cores_GTA4.bat (2 cores for game, rest for Remix) or the 50/50 split variant, setting in-game view distance to 50 and quality to 30 (higher hits CPU limits faster), lowering path tracing quality via Alt+X Graphics Preset, increasing tree alpha cutout via F4 for blockier leaves, and enabling filler light ignores for dimmer indoors; first launches may glitch but retrying resolves them.
This mod revives the notoriously buggy 2008 PC port, offering GTA fans a stunning path-traced Liberty City to bridge the wait for GTA VI, delayed to November 19, 2026.
Source: Github
