What FPS will I get in Last Epoch at 1440p?

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

Does GeForce RTX 5090 AORUS XTREME WATERFORCE support DLSS or FSR in Last Epoch?

Yes — Last Epoch supports dlss2, dlss3, frame_gen_dlss.

Yes — the GeForce RTX 5090 AORUS XTREME WATERFORCE runs Last Epoch at approximately 240 FPS at 1080p Ultra (native, no upscaling).

✓Yes — Excellent

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