If you mean NVIDIA’s Atomic Heart RTX Tech Demo, the official listing still identifies the showcase, but its outbound Mundfish download link currently returns a 404 page. That means an official working download is not confirmed. Steam’s separately listed Atomic Heart Demo is a different product and should not be treated as the RTX technology demo.
Which Atomic Heart demo are you looking for?
There are two distinct references using the Atomic Heart name:
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| Listing | Purpose | Source and availability | Confirmed details |
|---|---|---|---|
| Atomic Heart RTX Tech Demo | A graphics technology showcase for ray-traced effects and DLSS. | NVIDIA’s Download NVIDIA Tech Demos page links onward to Mundfish. The linked destination, mundfish.com/en/rtxtechdemo/, returned 404 when checked on September 28, 2026. | NVIDIA lists April 11, 2019, and says it was originally released for GeForce RTX 20-Series graphics cards. |
| Atomic Heart Demo | A separate game-demo listing on Steam, not the NVIDIA RTX showcase. | Steam store listing; Steam Support identifies app ID 2407990. | The store page is age-gated and warns about blood and gore, intense violence, language, and nudity. |
How to check the RTX technology demo listing
- Open NVIDIA’s GeForce Tech Demos page.
- Find the entry named Atomic Heart RTX Tech Demo.
- Follow its Mundfish download link if NVIDIA presents one.
- If the link resolves to a 404 page, there is no confirmed working official download at that destination. Avoid treating third-party mirrors as an equivalent official source.
What the RTX demo was designed to show
NVIDIA describes the showcase as an early look at Mundfish’s graphically advanced Atomic Heart, enhanced with ray-traced reflections and shadows and accelerated by Deep Learning Super Sampling (DLSS). The April 11, 2019 date and RTX 20-Series reference are historical listing information, not a current guarantee that the demo runs on a particular operating system or graphics card.
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Do not use the full game’s requirements as demo requirements
Steam publishes hardware requirements for the full PC game on its Atomic Heart store page. NVIDIA does not provide a complete current requirements list for the RTX technology demo, so the figures below must not be presented as requirements for that showcase.
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| Full game tier | Steam-listed specification |
|---|---|
| Minimum | Windows 10 20H1 or newer, 64-bit; AMD Ryzen 3 1200 or Intel Core i5-2500; 8 GB RAM; Radeon R9 380 or GeForce GTX 960 with 4 GB VRAM; DirectX 12; 90 GB storage. |
| Recommended | Windows 10 64-bit; AMD Ryzen 5 2600X or Intel Core i7-7700K; 16 GB RAM; Radeon RX 6700 XT or GeForce RTX 2070 with 8 GB VRAM; DirectX 12; 90 GB storage. An SSD is recommended. |
Those specifications describe the commercial game, not evidence that either demo will install or run on the same hardware.
Can you download it today?
The evidence supports identifying the RTX showcase and its original release details, but not confirming a live official installer. NVIDIA’s page remains the authoritative place to check for a restored link; the Mundfish URL attached to that listing was returning 404 at the time checked. The Steam Atomic Heart Demo is a separate listing and is the only distinct demo reference with a live Steam store page in the available sources.
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Practical decision
- Want the ray-tracing showcase? Check NVIDIA’s listing, but expect that the linked download may be unavailable.
- Want to try Atomic Heart through Steam? Open the separate Atomic Heart Demo listing and review its age gate and content warnings.
- Choosing hardware? The RTX 20-Series note only describes the technology demo’s original target; it does not establish compatibility with newer GPUs or current Windows versions.
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