Mark Cerny would like to get one thing out of the way right now: The videogame console that Sony has spent the past four years building is no mere upgrade.

You’d have good reason for thinking otherwise. Sony and Microsoft both extended the current console generation via a mid-cycle refresh, with the Xbox One and PlayStation 4 spawning mini-sequels (the Xbox One X and PS4 Pro). “The key question,” Cerny says, “is whether the console adds another layer to the sorts of experiences you already have access to, or if it allows for fundamental changes in what a game can be.”

The answer, in this case, is the latter. It’s why we’re sitting here, secreted away in a conference room at Sony’s headquarters in Foster City, California, where Cerny is finally detailing the inner workings of the as-yet-unnamed console that will replace the PS4.

Senior correspondent Peter Rubin covers culture and technology for WIRED.

If history is any guide, it will eventually be dubbed the PlayStation 5. For now, Cerny responds to that question—and many others—with an enigmatic smile. The “next-gen console,“ as he refers to it repeatedly, won’t be landing in stores anytime in 2019. A number of studios have been working with it, though, and Sony recently accelerated its deployment of devkits so that game creators will have the time they need to adjust to its capabilities.

As he did with the PS4, Cerny acted as lead system architect for the coming system, integrating developers’ wishes and his own gaming hopes into something that’s much more revolution than evolution. For the more than 90 million people who own PS4s, that's good news indeed. Sony’s got a brand-new box.

A true generational shift tends to include a few foundational adjustments. A console’s CPU and GPU become more powerful, able to deliver previously unattainable graphical fidelity and visual effects; system memory increases in size and speed; and game files grow to match, necessitating larger downloads or higher-capacity physical media like discs.

PlayStation’s next-generation console ticks all those boxes, starting with an AMD chip at the heart of the device. (Warning: some alphabet soup follows.) The CPU is based on the third generation of AMD’s Ryzen line and contains eight cores of the company’s new 7nm Zen 2 microarchitecture. The GPU, a custom variant of Radeon’s Navi family, will support ray tracing, a technique that models the travel of light to simulate complex interactions in 3D environments. While ray tracing is a staple of Hollywood visual effects and is beginning to worm its way into high-end processors and Nvidia's recently announced RTX line, no game console has been able to manage it. Yet.

Ray tracing’s immediate benefits are largely visual. Because it mimics the way light bounces from object to object in a scene, reflective surfaces and refractions through glass or liquid can be rendered much more accurately, even in real time, leading to heightened realism. According to Cerny, the applications go beyond graphic implications. “If you wanted to run tests to see if the player can hear certain audio sources or if the enemies can hear the players’ footsteps, ray tracing is useful for that,” he says. “It's all the same thing as taking a ray through the environment.”

The AMD chip also includes a custom unit for 3D audio that Cerny thinks will redefine what sound can do in a videogame. “As a gamer,” he says, “it's been a little bit of a frustration that audio did not change too much between PlayStation 3 and PlayStation 4. With the next console the dream is to show how dramatically different the audio experience can be when we apply significant amounts of hardware horsepower to it.”

The result, Cerny says, will make you feel more immersed in the game as sounds come at you from above, from behind, and from the side. While the effect will require no external hardware—it will work through TV speakers and virtual surround sound—he allows that the “gold standard” will be headphone audio.