In Full HD, you can get by GeForce GTX 670 with 2 GB of memory

But at maximum graphics settings, you need more powerful adapters

Diablo IV has already become available for a number of players, and the authors of Tom`s Hardware decided to test the game on different video cards, including very old ones, because the project has low system requirements, and gamers who participated in the beta test reported that the game feels great on older GPUs. 

It turned out that even old 3D cards like the GeForce GTX 670 are enough for normal operation of the game in Full HD at minimum graphics quality settings. Even such an adapter with only 2 GB of memory provides more than 60 fps, although the 1% Low indicator drops up to 28 fps. The GTX 1050 performs better, hitting 56 fps and around 40 fps for 1% Low.  

In Full HD, you can get by GeForce GTX 670 with 2 GB of memory

At the same resolution, but already at the maximum graphics quality settings, the GTX 1050 is no longer enough, as the 1% Low value drops to 15 fps. But the GTX 970 or RX 570 handles the game without any problems. 

In the same mode, but at 1440p resolution, it is better to get something like the RX 590 or GTX 1070, although the activation of FSR 2 allows you to continue using the same GTX 970. 

4K resolution traditionally places much higher demands on the graphics subsystem. Here you already need a video card of a level not lower than the Radeon RX 6600, but better than the RTX 3060. For the cherished 60 fps, you will have to buy at least an RTX 4060 Ti or RX 6700 XT.