How League of Legends runs on the GeForce RTX 5090
Our estimate puts the GeForce RTX 5090 at about 300+ fps on High at 1080p in League of Legends, which means it runs comfortably. On Low the same card manages about 300+ fps, and on Ultra about 300+.
The graphics card is the limit here, so lowering the resolution or the quality preset is what raises your frame rate.
For a steady 60 fps, our estimate says: 1080p: Ultra (about 300+ fps); 1440p: Ultra (about 300+ fps); 4K: Ultra (about 300+ fps).