What FPS will I get in Warhammer 40,000: Rogue Trader at 1440p?

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

Does GeForce RTX 5080 (1-click OC) support DLSS or FSR in Warhammer 40,000: Rogue Trader?

Yes — Warhammer 40,000: Rogue Trader supports dlss2, dlss3, frame_gen_dlss.

Yes — the GeForce RTX 5080 (1-click OC) runs Warhammer 40,000: Rogue Trader at approximately 240 FPS at 1080p Ultra (native, no upscaling).

✓Yes — Excellent

Expected: 240 FPS @ 1080p Ultra (native).