PSSR Upscaling

How PSSR Works

PSSR is an AI-based upscaling library that analyzes game images pixel by pixel as it upscales them from lower internal rendering resolutions to a target output resolution. The neural network stems from a Project Amethyst partnership between Sony and AMD, incorporating findings from AMD's FSR 4 technology and refined through six additional months of optimization specific to the PS5 Pro platform.

The technology uses a machine learning approach to reconstruct fine detail rather than applying simple filtering. The neural network has learned to recognize material types (metal, glass, skin) and apply differentiated smoothing methods to each, preserving natural shine and micro-details while avoiding artificial artifacts.

Technical Specifications

PSSR has a 250 MB memory footprint on the PS5 Pro. The console's additional 1.2 GB of GPU-accessible RAM (13.7 GB total for games versus 12.5 GB on standard PS5) was not specified by Sony as being sized specifically for PSSR.

For upscaling targets, PSSR can reconstruct games rendering internally at 1080p to a convincing 4K image. The leaked specification for PSSR 2.0 includes wider resolution offerings: 1440p at 120 Hz, 1080p at 120 Hz, and 8K @ 60 Hz capability, though these figures remain unconfirmed by Sony as of mid-2026.

PSSR 2.0 introduces stochastic sampling to handle randomly-sampled lighting and reflection data from ray tracing without sacrificing temporal stability, enabling the technology to process ray-traced content efficiently while maintaining frame-to-frame coherence.

Image Quality & Material Handling

PSSR 2 represents a marked improvement over the original implementation, reportedly closing the gap with FSR 4 and contemporary DLSS versions, with reduced flickering and improved texture clarity. The technology successfully processes intricate fine details traditionally difficult to upscale, including textile stitching, hair strands, and small environmental text.

In practical comparisons, PSSR delivers image quality comparable to DLSS in many scenes, though DLSS generally delivers more detailed textures and finer overall detail. PSSR produces a softer image with slightly weaker anti-aliasing than DLSS. Against AMD FSR 3.1, PSSR is superior in anti-aliasing and motion handling, though FSR 4 reportedly maintains greater stability at oblique angles and with distant granular detail, where PSSR occasionally exhibits aliasing.

Compatibility & Adoption

PSSR is reportedly backward compatible, allowing enhancement of existing PS5 games on PS5 Pro hardware without requiring new development. Over 50 PS5 Pro titles currently utilize PSSR technology as of early 2026, with Sony continuing to roll out the upgraded PSSR 2 to new releases.

Limitations & Known Gaps

Sony has not publicly disclosed the detailed neural network architecture, training datasets, internal layer topology, or machine learning frameworks used to develop PSSR beyond general descriptions of AI/ML upscaling. Quantitative quality metrics (PSNR, SSIM, perceptual quality scores) for reconstruction below practical minimum thresholds remain unavailable from manufacturer and third-party sources. Direct technical comparison of temporal artifact handling between PSSR and competing frame-generation technologies has not been extensively documented in publicly available benchmarks.