NVIDIA has released Geforce Game Ready Driver v531.79 which includes DLSS 2 for the upcoming Diablo 4 Server Slam. You must have an RTX GPU in order to enable from DLSS 2.

Following the successful Open Beta, Blizzard invites you to stress test their servers in the Diablo 4 Server Slam, occurring May 12-14. Players will have one more chance to earn special cosmetic rewards, including the Beta Wolf Pack Cosmetic and a new Mount Trophy. When you play with a GeForce RTX GPU, you can activate DLSS 2 to accelerate your frame rates, enabling you to experience Diablo 4 at the highest detail levels and resolutions. And when Diablo 4 launches June 6, GeForce RTX 40 series can activate DLSS 3 for even faster performance.