What FPS will I get in Left 4 Dead at 1440p?

At 1440p Ultra native, expect around 0 FPS. With DLSS Quality you can push higher.

Does GeForce RTX 5090 Founders Edition support DLSS or FSR in Left 4 Dead?

Left 4 Dead does not currently support upscalers.

Yes — the GeForce RTX 5090 Founders Edition runs Left 4 Dead at approximately 0 FPS at 1080p Ultra (native, no upscaling).

✕No — Too Weak

Expected: 0 FPS @ 1080p Ultra (native). This GeForce RTX 5090 Founders Edition is currently $4085.00 at Newegg ↗