PS5 Games Now Run on Xbox Series X, but a 5GB Limit Holds Them Back

PS5X has managed to run four PlayStation 5 games on Microsoft's console, but a strict Developer Mode memory limit stands between this early experiment and something Xbox players can actually use.

The idea of playing PlayStation 5 games on an Xbox Series X sounds like the kind of thing that should not work. Sony and Microsoft compete over console exclusives, hardware and services, after all. Yet developer Devran Cosmo Uenal has managed to get PS5 games running on Microsoft's console through an experimental emulator called PS5X.

In a YouTube video published on September 8, Uenal demonstrated the PlayStation 5 version of Quake II running on an Xbox Series X, complete with Xbox controller support. Three other games have also been shown working through the project: GEX Trilogy, Hellboy: Web of Wyrd and Marvel Cosmic Invasion.

That is a notable technical achievement, but it does not mean Xbox owners can suddenly play their favourite PlayStation exclusives. PS5X currently runs inside Microsoft's official Developer Mode, where games face a 5GB memory limit. With a regular Xbox game able to use considerably more memory, that restriction puts a hard ceiling on what the emulator can realistically handle.

Here's what PS5X does, which games it can run, and why the project is more interesting as an emulation experiment than a practical way to play PS5 games on Xbox.

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What is PS5X, and how does it work?

PS5X is an Xbox port of KytyPS5, an open-source PlayStation 5 emulator originally developed for PC. Rather than turning an Xbox Series X into a PlayStation 5, the project attempts to translate the instructions a PS5 game uses into commands that Microsoft's console can understand.

That approach is possible partly because the two consoles share similar underlying hardware. Both use AMD processors built around the Zen 2 architecture, RDNA 2 graphics and 16GB of GDDR6 memory. PS5 games also use the x86-64 processor architecture, which is familiar to modern PCs.

The shared architecture gives developers a starting point, but it does not make the two systems interchangeable. Their operating environments and graphics APIs still differ, creating another challenge for the emulator.

KytyPS5 uses Vulkan to handle graphics on PC, while Xbox Developer Mode supports DirectX 11 and DirectX 12. In the YouTube demonstration published by developer Devran Cosmo Uenal, he explained the problem directly: “Since Vulkan isn't supported, everything needs to be translated to DirectX.”

That extra translation creates another layer of work. Improvements made to KytyPS5's PC renderer cannot necessarily be transferred directly to the Xbox port; they may need to be adapted before they work under DirectX.

In other words, PS5X is not simply copying a PS5 game onto an Xbox and pressing play. It is attempting to bridge two different software environments, and every compatibility fix brings the project a little closer to running more games. You can follow the original emulator's development through its GitHub repository.

Which PS5 games can run on Xbox Series X?

At the time of the reported demonstration, PS5X had shown compatibility with four games:

• Quake II: The PS5 version was demonstrated running with Xbox controller inputs. TweakTown estimated performance at roughly 25 to 45 frames per second in the footage.
• GEX Trilogy: The collection of classic platformers was also shown working through the emulator.
• Hellboy: Web of Wyrd: The action-adventure game is among the titles demonstrated running through PS5X.
• Marvel Cosmic Invasion: The beat-'em-up was another addition to the project's early compatibility list.

These results are promising, but there is an important distinction between getting a game to run and delivering a reliable playing experience. Some titles have working audio, while performance and compatibility remain limited.

There is also no demonstrated PS5-exclusive blockbuster in this list. All four games are available on other platforms, so the current lineup does not yet show that Xbox players can use PS5X to access games they otherwise could not play.

The broader PS5 emulation scene is making progress, too. Android Authority reported on September 28 that KytyPS5 had reached in-game stages in a range of titles on PC, while footage of Marvel's Wolverine reportedly showed the game reaching its main menu on a system equipped with an Nvidia RTX 5090. That was not a demonstration of playable gameplay, however, and it should not be confused with PS5X running the game on Xbox.

Progress on PC could eventually help the Xbox project, but only when the necessary improvements are adapted for DirectX and can fit within the console's memory restrictions.

Why the Xbox Series X's 5GB memory limit is a problem

This is where the project runs into its biggest obstacle.

Microsoft's Developer Mode gives games a maximum of 5GB of memory, while apps are limited to 1GB. A regular retail Xbox Series X game can use around 13.5GB of the console's 16GB of memory, with the remainder reserved for the operating system and other system functions.

That means PS5X has access to less than 40% of the memory available to a typical retail Xbox game.

The restriction matters because an emulator needs memory for more than the game itself. It also has to manage the emulation process, translate instructions and handle graphics resources. Even if the underlying hardware is powerful enough to process a game's workload, the available memory can prevent it from running properly.

Large modern games are particularly difficult to accommodate under those conditions. Their assets, rendering requirements and other workloads can quickly exceed the space available to PS5X.

Microsoft does allow higher memory limits when software runs through the Visual Studio debugger, a development setup intended for testing and debugging applications. That is not the same as offering a straightforward workaround for ordinary Xbox owners who want to play retail games.

Without a change in the project's requirements or a different way to run it, the memory cap will continue to limit what PS5X can achieve.