What FPS will I get in Red Dead Redemption 2 at 1440p?

At 1440p Ultra native, expect around 166 FPS. With DLSS Quality you can push higher.

Does GeForce RTX 5080 VANGUARD SOC LAUNCH EDITION support DLSS or FSR in Red Dead Redemption 2?

Yes — Red Dead Redemption 2 supports dlss2.

Yes — the GeForce RTX 5080 VANGUARD SOC LAUNCH EDITION runs Red Dead Redemption 2 at approximately 191 FPS at 1080p Ultra (native, no upscaling).

✓Yes — Excellent

Expected: 191 FPS @ 1080p Ultra (native). This GeForce RTX 5080 VANGUARD SOC LAUNCH EDITION is currently $2059.00 at Newegg ↗