What FPS will I get in Satisfactory at 1440p?

At 1440p Ultra native, expect around 172 FPS. With DLSS Quality you can push higher.

Does GeForce RTX 4090 ROG Matrix Platinum support DLSS or FSR in Satisfactory?

Yes — Satisfactory supports dlss2, fsr2.

Yes — the GeForce RTX 4090 ROG Matrix Platinum runs Satisfactory at approximately 240 FPS at 1080p Ultra (native, no upscaling).

✓Yes — Excellent

Expected: 240 FPS @ 1080p Ultra (native). This GeForce RTX 4090 ROG Matrix Platinum is currently $8699.97 at Amazon ↗