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NVIDIA has added optional DLSS 5 Neural Rendering to Portal with RTX and the currently available Half-Life 2 RTX demo. Both updates also include other rendering and frame-generation features, but performance gains for these games have not been established through independent testing.

NVIDIA has added DLSS 5 Neural Rendering to Portal with RTX and the currently available Half-Life 2 RTX demo, giving players of both path-traced Valve projects an optional AI-based graphics feature. The updates also add frame-generation and rendering options, though the performance effect of DLSS 5 in these particular games has not yet been established through independent testing.

The Portal with RTX update arrived October 21, according to the release details. Players can install it through Steam and open the RTX Remix overlay by pressing Alt + X. DLSS 5, listed as 3D-Guided Neural Rendering, is optional and disabled by default; players can turn it on from the RTX Remix settings. The update also adds DLSS Frame Generation Performance Mode, known as Preset C, and 5X and 6X Multi Frame Generation options.

The Half-Life 2 RTX demo update followed October 23. NVIDIA representative Jacob Freeman announced the additions on X, including DLSS 5 Neural Rendering, Frame Generation Preset C, up to 6X Multi Frame Generation, and DLSS 4.5 Super Resolution with Preset F. Players access the settings through the same Alt + X overlay. This update applies to the available demo, not a completed remaster; the full project remains in development at Orbifold Studios.

Both releases include other graphics changes. Portal with RTX adds Sparse Rendering, which reduces lighting samples and uses DLSS Ray Reconstruction to reconstruct the image, and Spatially Hashed Radiance Cache, an alternative approach to indirect-light caching. The update also includes shadow terminator fixes intended to reduce jagged self-shadowing on curved or low-polygon surfaces. NVIDIA has not provided equivalent game-specific performance figures for these changes in the details available.

New AI Rendering in Two RTX Games

The updates put DLSS 5 into two playable RTX Remix projects, allowing users to try the feature in different visual settings: Portal’s test chambers and the environments represented in the Half-Life 2 demo. That gives players a way to compare neural rendering with the games’ path-traced presentation, while also giving modders a practical example of how the technology can be incorporated into older games.

DLSS 5 differs from features that raise output resolution or generate extra frames. NVIDIA describes it as a final neural-rendering stage that uses the rendered image and motion vectors to alter aspects such as lighting, materials, and fine detail while remaining guided by the original scene. The distinction matters because a change in image appearance is not, by itself, evidence of higher frame rates. Claims about overall performance in these titles need to be separated from NVIDIA’s reported results elsewhere.

Access also depends on hardware. DLSS 5 Neural Rendering is limited to GeForce RTX 50 Series GPUs and RTX Spark hardware, according to the release information. Frame Generation Preset C supports RTX 40 Series cards, while 5X and 6X Multi Frame Generation require compatible RTX 50 Series hardware. The added options therefore do not apply equally to every player, even when the underlying game update is available.

How DLSS 5 Differs From Earlier Features

DLSS Super Resolution reconstructs an image at a higher resolution, while Frame Generation creates additional frames. DLSS 5 instead works on the appearance of rendered frames, using image data and motion vectors to guide neural enhancements. NVIDIA says the method benefits from richer visual information, making path-traced games a relevant setting for its use.

The two game updates follow the release of RTX Remix 1.6, NVIDIA’s open-source modding platform. That version introduced DLSS 5 integration, expanded frame-generation support, Windows on ARM support, and additional tools for modders. RTX Remix also provides artistic controls to adjust neural-rendering intensity, choose models, or exclude selected objects and materials from the effect.

NVIDIA has described a more efficient DLSS 5 model with about 118 million parameters, a 24% reduction in parameter count and 20% lower VRAM use at 4K compared with the earlier implementation. The company has also reported twice the execution performance while maintaining comparable visual fidelity. It previously cited an overall frame-rate improvement of up to 1.4 times in NBA 2K27; that figure is not a measured result for Portal with RTX or Half-Life 2 RTX.

“New update is live for Half-Life 2 RTX Demo! Added option for DLSS 5 NR, Frame Generation Preset C, up to 6X MFG and DLSS 4.5 SR (Preset F).”

— Jacob Freeman, NVIDIA

Game-Specific Results Still Unknown

Independent image-quality and performance testing for DLSS 5 in these two games was not included in the update details. NVIDIA’s reported improvements to the optimized model and its NBA 2K27 performance example do not establish the same results in either RTX Remix title. The visual effect, hardware load, and any change in frame rate will need to be assessed separately for each game and configuration.

The updates list new capabilities but do not specify every supported GPU, resolution, or settings combination for each feature. Players should check the relevant game and RTX Remix settings on their own systems. It is also not clear when the full Half-Life 2 RTX project will be released; the announced update is for the demo, and the complete remaster is still in development.

Testing and the Full Remaster

Players can install the updates through Steam, enable DLSS 5 from the Alt + X RTX Remix overlay, and compare the optional setting with it turned off. Independent testing can help establish how the feature affects image quality and performance across supported hardware, particularly because NVIDIA’s broader model claims do not provide a game-specific benchmark.

For Half-Life 2 RTX, the next major milestone remains the release of the complete remaster, which is still being developed by Orbifold Studios. No release date is provided in the update information. Until further details arrive, the newly updated demo is the version players can use to explore DLSS 5 and the additional rendering options.

Key Questions

Which games received DLSS 5 Neural Rendering?

Portal with RTX and the currently available Half-Life 2 RTX demo received DLSS 5 Neural Rendering through updates released October 21 and October 23, 2026, respectively.

How do players enable DLSS 5?

Open the RTX Remix overlay with Alt + X while playing, then enable 3D-Guided Neural Rendering in the settings. The feature is optional and disabled by default in Portal with RTX.

What hardware supports DLSS 5?

The release information lists DLSS 5 Neural Rendering for GeForce RTX 50 Series GPUs and RTX Spark hardware. Some separate features have wider or different requirements: Frame Generation Preset C supports RTX 40 Series, while 5X and 6X Multi Frame Generation require compatible RTX 50 Series hardware.

Does the Half-Life 2 RTX update include the full remaster?

No. The update applies to the currently available demo. The complete Half-Life 2 RTX project remains in development at Orbifold Studios, and no release date is given here.

Are there confirmed DLSS 5 performance gains in these games?

No game-specific performance result is provided for Portal with RTX or the Half-Life 2 RTX demo. NVIDIA’s figures for its optimized model and an example from NBA 2K27 should not be treated as measured gains in these two titles.

Source: Wccftech