What FPS will I get in Risk of Rain 2 at 1440p?

At 1440p Ultra native, expect around 180 FPS. With DLSS Quality you can push higher.

Does GeForce RTX 5090 Founders Edition support DLSS or FSR in Risk of Rain 2?

Yes — Risk of Rain 2 supports dlss2.

Yes — the GeForce RTX 5090 Founders Edition runs Risk of Rain 2 at approximately 240 FPS at 1080p Ultra (native, no upscaling).

✓Yes — Excellent

Expected: 240 FPS @ 1080p Ultra (native). This GeForce RTX 5090 Founders Edition is currently $4085.00 at Newegg ↗