Hands-On Review of NVIDIA DLSS 4.5 Ray Reconstruction Update
NVIDIA's DLSS 4.5 Ray Reconstruction update introduces a second-generation Transformer AI model that increases compute capacity by 35% and parameter count by 20%. Hands-on testing shows this new model improves ray-traced and path-traced image quality, such as reflections and details, without degrading performance. This update demonstrates how AI-driven reconstruction can continue to push the boundaries of real-time graphics fidelity on RTX GPUs without requiring more hardware power. It allows gamers to experience more realistic lighting, reflections, and shadows in demanding path-traced games. The update features a stronger denoiser and deeper spatial awareness, with testing conducted using the new "Preset F" model on an RTX 5070 Ti GPU. Users can manually enable and customize these DLSS 4.5 model presets through the NVIDIA App.
## BACKGROUND
Ray Reconstruction was first introduced in DLSS 3.5 to replace hand-tuned denoisers with an AI neural network trained on supercomputers, generating higher-quality pixels between sampled rays. Path tracing is an advanced rendering method that simulates realistic light physics but is highly computationally expensive, making AI denoising essential for playable frame rates in real-time games.