GTA 4 RTX Remix Path Tracing Mod Just Got Its Biggest Upgrade Yet
GTA 4 fans, the RTX Remix path tracing mod just leveled up. Modder xoxor4d has pushed out not one but two updates, 1.7.1 and 1.7.2, and the first one rewrites how the whole mod renders the game. If you have been waiting for the right moment to replay Liberty City with full path tracing, this is it.
If you searched for the GTA 4 RTX Remix 1.7.2 update, this guide covers all of it: what changed, how to install it, whether your PC can run it, and if it is worth the download.
What the GTA 4 RTX Remix mod actually is
The mod takes Grand Theft Auto 4 and rebuilds its lighting with full path tracing using NVIDIA’s RTX Remix runtime. Path tracing traces the path of every light ray in the scene, producing reflections, shadows, and global illumination the original 2008 renderer could never do. Early versions had to intercept every draw call and rebuild the scene from scratch, which was brutally heavy on the CPU. Updates 1.7.1 and 1.7.2 fix exactly that, and finish the job on water, weather, and stability.
The Biggest Change: Native RTX Remix API Rendering
Before 1.7.1, Remix had to catch every draw call from GTA 4 and rebuild the scene from scratch. That put a heavy load on the CPU, and the game choked in busy parts of the city. It also limited how far you could see. Kudos to xoxor4d for tackling that head on.
The new system takes the game’s own 3D data and sends it straight to the Remix runtime. This skips most of the old Direct3D 9 path, and full path tracing stays on. Here is what that means for you:
- Much longer draw distances across Liberty City
- More work shifted from the CPU to the GPU, so busy streets run smoother
- Car damage, dirt, paint and flat tires all preserved
- Your mesh and material mods keep working
If you have ever wondered what path tracing actually does to a game’s look, our PC graphics settings guide explains the tech in plain language.
Water, Rain and Wet Streets Overhauled
The update brings a full water overhaul. Waves now cover a much larger area around the player, and new distant waves follow the same wind and motion as the water near you. A new shore system fades water out as it gets shallow or meets land, which removes the hard bright lines that once appeared along coasts. You can pick from four water presets: Performance, Standard, Quality and Insane.
Rain and wet surfaces got a major upgrade too. The new wetness system creates puddles in low spots, road dips and potholes. Puddles grow as rain falls and dry from the edges once the rain stops. They also react to wind and raindrops. Roads and other surfaces stay wet for longer, then slowly dry out. Rain no longer falls through roofs and bridges, and wet cars look better. Best of all, this new wetness system uses less GPU power than the old one.
Rain itself has also changed. The old rain effects are off by default now. The Remix runtime handles rain particles directly, which look better and no longer show up inside buildings. The new system also adds rain shadows under roofs and bridges.
Sky, Fog, Nights and HDR
The sky, fog and weather have been improved across the board:
- A new atmosphere system lets aerial perspective and volumetric fog work together, for better sunrises and sunsets with more natural haze and sun rays
- Weather presets are now editable through separate config files
- Distant street lights work as they should at night, and the bug that stretched fake distant cars across the screen is fixed
- HDR support that works with both the Alt HDR10 tonemapper and the default Psycho17 tonemapper
- The latest official DLSS 5 model, plus improved auto exposure, better looking car headlights and more detail on very distant trees
- Small fixes for fog, rain, stars and the moon. Lightning no longer leaves a long trail in the fog, and raindrops now react to sky light the right way
Under the Hood: Faster Loading and Fixed Crashes
There are many changes under the hood. The runtime now uses the GPU to handle mesh skinning. It also improves how it loads and replaces textures. New settings let you turn parts of the Remix API on or off, covering world objects, people, cars and water. The menu has also been split into clear tabs for easier use.
The update fixes several crashes and freezes. It fixes crashes when you switch to another window or minimize the game at the wrong time, plus crashes tied to people and other animated objects. The HUD and menus now keep the right size after a change in screen resolution, and explosion colors have been fixed by removing old baked lighting from some effects.
AutoPBR keeps changing many game materials to make them look more like real world surfaces. The optional RTXIO version is much faster to load. It can cut load times to just a few seconds and also reduce stutters. The installer guides you through the setup, shows clearer error messages and uses Git to speed up future updates.
What Update 1.7.2 Adds on Top
Update 1.7.2 builds on these changes with more performance tweaks:
- Weather settings tuned to reduce cloud depth and other costly effects. This helps performance, especially when the GPU is the main limit
- The timecycle system now writes weather values only when they change, which avoids needless work while the game runs
- New DLSS Neural Rendering and HDR settings in the RTX Remix menu
- Graphics presets now use SHARC below the Ultra setting and turn on sparse rendering, while the Auto preset stops at High
- The main RTX config file removes fixed graphics settings so Remix can pick a preset that fits each PC
- Settings tuned for better GPU performance, including Homogeneous Volumetrics turned off and adjustments to cloud, level of detail, sampling and distant haze
- The installer picks the right RTXIO file based on your Windows version automatically
If the new presets still push your GPU too hard, our best PC settings for maximum FPS guide walks you through squeezing out smooth frame rates the right way.
How to Install and Enable Path Tracing
Getting the mod running is straightforward, and 1.7.2’s installer does most of the work:
- Start with a clean GTA 4 install. A fresh copy with no conflicting mods is the safest base, since the mod replaces core rendering files.
- Download the latest release. Grab 1.7.2 rather than an older version, since the native API rendering changes are the whole point.
- Run the installer. It walks you through setup, shows clearer error messages, picks the correct RTXIO file for your Windows version, and uses Git to speed up future updates. Keep the mod folder as a Git repository and the next patch will be painless.
- Choose the RTXIO build if offered. The RTXIO variant loads in just a few seconds and reduces stutters. There is little reason to skip it.
- Let the Auto preset pick your settings. Auto stops at High and is tuned for a wide range of PCs. Only push toward Ultra manually if your GPU has headroom.
- Enable ray tracing effects in the Remix menu. Path tracing, DLSS, and the new Neural Rendering and HDR options live in the Remix menu, now split into clear tabs. Tweak one category at a time so you know what each setting costs.
You can find the full changelog and download details in DSOGaming’s coverage of the release.
Tuning Performance If Your GPU Struggles
If your frame rate is low, work through these in order:
- Drop the graphics preset one step. The Auto preset at High is the sane default. Ultra is for high-end cards only.
- Lower the water preset. The Insane water setting is the heaviest. Performance or Standard water can buy back real GPU time.
- Use DLSS. The DLSS 5 model and Neural Rendering settings in the Remix menu are the single biggest performance lever in the mod.
- Leave Homogeneous Volumetrics off. 1.7.2 already does this for you; do not re-enable it on a weaker card.
- Let the preset logic do its job. Presets below Ultra use SHARC and sparse rendering for a reason. Override settings manually only after the defaults prove too slow.
Quick Fixes for Common Issues
Most of the problems that used to plague this mod are already solved in 1.7.1 and 1.7.2: alt-tab crashes are fixed, the HUD and menus keep the right size after resolution changes, the RTXIO build cuts loading to just a few seconds, and mesh and material mods are preserved by the native API update. If setup confuses you, re-run the 1.7.2 installer rather than hand-editing files. It walks you through everything and shows clearer error messages.
The Verdict: Is This the Version to Install?
Yes. Update 1.7.1 is the architectural change that makes the mod worth it: the native RTX Remix API rendering finally moves the heavy work from the CPU to the GPU and unlocks long draw distances without breaking car damage or third-party mods. Update 1.7.2 is the tuning pass that makes it livable, with weather and preset adjustments that target GPU-limited setups.
Liberty City at night in the rain, with puddles reflecting street lights and the whole city visible to the horizon, is genuinely transformative. Install the RTXIO build, start with the Auto preset, and only push settings up once you see how your GPU handles Algonquin at rush hour.
Have fun!
