Enlarge / This Assassin's Creed Valhalla screenshot is running at one frame per all of time (or 1 fpat).

With the added power of the Xbox Series X, Microsoft has been touting 4K resolution gaming at 60 frames per second as a new console standard. In recent days, though, we've been learning that not all Series X titles will be achieving that standard.

Back in March, Microsoft announced that 4K/60fps level as the "performance target" for Series X games. Microsoft wanted to "build a next generation console that could run games in 4K at 60fps with no compromises for developers," the company said. And Microsoft's Aaron Greenberg later tweeted that 60fps should be considered the "standard output" for Series X games.

But that target isn't a guarantee that all Series X games will run at 60fps. Ubisoft made that much clear in a recent statement to IGN:

Assassin's Creed Valhalla will run at a minimum of 30 fps. On Assassins Creed Valhalla, we are committed to offer the best experience to our players by immersing them in the most beautiful worlds and environments we could create, and leveraging not only the graphics enhancements offered by the next generation of consoles, but also faster loading times and the new architectures.

Microsoft further clarified the situation in a series of tweets to the Verge's Tom Warren. "Ultimately, it is up to individual developers to determine how they leverage the power and speed of Xbox Series X," the company said. "Developers always have flexibility in how they use the power, so a standard or common 60 fps is not a mandate."

How many frames do you need?

Measuring how fast the human visual system can actually perceive changes is a pretty tricky business. There's a robust debate over precisely how fast a display's refresh rate can get before you hit a point of diminishing returns as far as letting an average player detect less apparent motion "flicker."

That said, Professor Thomas Busey told PC Gamer in 2017 that going from 30fps to 60fps is "demonstrably better" as far as motion perception. For games where quick reactions are important, 60fps has long been considered a common target.

When playing on PC, frame rates are usually "unlocked," meaning players with strong enough hardware can push the performance as fast as their display allows. But frame rates on consoles are usually locked to a set rate meant to optimize performance on known hardware.

In recent years, that has meant a number of high-profile games running at only 30fps on consoles, even as the PC versions of those games usually allow for much smoother frame rates. The mid-generation hardware upgrades of the Xbox One X and PS4 Pro helped more games achieve hit that 60fps rate, but many console games still struggled to reach that level of performance consistently (while other games offered enhanced-console players a choice to prioritize frame rate or resolution in the settings menu).

With the Xbox Series X's "performance target," Microsoft seems to be saying that any decision to not reach 60fps on the system is a distinct choice by the developer, not a reflection on the hardware itself. Xbox Series X development chief Jason Ronald made this expliciRead More – Source

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