What FPS will I get in SCUM at 1440p?

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

Does GeForce RTX 5080 ROG Astral Dhahab CORE OC support DLSS or FSR in SCUM?

Yes — SCUM supports dlss2, dlss3, dlss4.

Yes — the GeForce RTX 5080 ROG Astral Dhahab CORE OC runs SCUM at approximately 240 FPS at 1080p Ultra (native, no upscaling).

✓Yes — Excellent

Expected: 240 FPS @ 1080p Ultra (native). This GeForce RTX 5080 ROG Astral Dhahab CORE OC is currently $2295.00 at Amazon ↗