NVIDIA has released Portal: Prelude RTX, a community remaster of this classic Portal mod, created with NVIDIA RTX Remix and featuring full ray tracing, NVIDIA DLSS 3, NVIDIA Reflex and NVIDIA RTXIO.
According to the green team, Portal Prelude is the first game that takes advantage of RTXIO. It’s also the first remaster created entirely by modders with the RTX Remix creator toolkit.
To bring Portal: Prelude RTX to life, NVIDIA collaborated with Nicolas “NykO18” Grevet, the original creator of Portal Prelude, and famous modder David “Kralich” Driver-Gomm to modernize Portal: Prelude’s assets and relight the game with stunning full ray tracing, also known as path tracing.
Similar to Portal RTX, Portal: Prelude RTX features cutting-edge graphics technologies. Within eight months, the mod team upgraded every frame with stunning full ray tracing, new, hand-crafted hi-res physically-based textures. Additionally, the team implemented new, enhanced high-poly models evocative of the originals.
Now as you may have guessed, Portal Prelude RTX supports NVIDIA DLSS 3, NVIDIA Reflex, and NVIDIA RTX IO. NVIDIA claims that DLSS 3 results in a performance upgrade of 5X on average at 4K with max settings. This basically means that GeForce RTX 4080 and 4090 users can expect 80 FPS+.
On the other hand, NVIDIA RTXIO delivers 5X faster texture load times in Portal: Prelude RTX. Not only that but thanks to RTX IO, the game utilizes 44% less disk space. NVIDIA RTX IO enables rapid GPU-based loading and asset decompression with optimizations through NVIDIA’s Game Ready Driver for both the DirectX and Vulkan APIs.
RTX IO is based on GDeflate, an open GPU compression standard contributed by NVIDIA, which is utilized by both Microsoft’s DirectStorage and new Vulkan Extensions. Portal: Prelude RTX leverages the new Vulkan Extensions.
Portal Prelude RTX will be available for download Steam later today. This game will be free to all owners of the Portal game. Until then, you can go ahead and watch its gameplay trailer.
Have fun!

John is the founder and Editor in Chief at DSOGaming. He is a PC gaming fan and highly supports the modding and indie communities. Before creating DSOGaming, John worked on numerous gaming websites. While he is a die-hard PC gamer, his gaming roots can be found on consoles. John loved – and still does – the 16-bit consoles, and considers SNES to be one of the best consoles. Still, the PC platform won him over consoles. That was mainly due to 3DFX and its iconic dedicated 3D accelerator graphics card, Voodoo 2. John has also written a higher degree thesis on the “The Evolution of PC graphics cards.”
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Ah yes, a DX9, Source game using DirecStorage.
Sure, why not
Its fully path traced and running on vulkan….
Yeah man, I know Remix is Vulkan RT. The base game is still DX9 Source code. What’s DirectStorage doing here exactly.
Loading 8-4k PBR textures and high poly models
You having zero clue what you’re talking about. Sure, it’s expected.
No please, do go on how DirectStorage will improve this vs regular Portal RTX.
https://www.youtube.com/watch?v=3smzEZDfeqg
2.5 whole seconds? Yes. A true representation of Direct IO.
You are showing your ignorance of the subject now…
7PM UK time, 3PM ET.
Still not the full fat nvme to gpu vram I/O from the looks of it, just added gdeflate. Direct storage 1.1 was already very fast (though Spider-Man somehow didn’t use it and was also extremely fast). Wonder how much faster this is compared to that.
John, you may want to embed a link to the Portal: Prelude RTX video that Nvidia just released on their official Geforce channel on Youtube.
**edit** looks like you did. GJ
Run your own website and do it.
rtxio is compatible with directstorage, but then why not simply use directstorage?
As far as I know RTX IO is a wrapper around Microsoft’s DirectStorage that can also provide the same features for Vulkan.