Performance ‐ what can you expect?

These are my tests based on system with AMD Ryzen 5800X3D CPU, 16 GB of 3200MT RAM and RTX 3090 GPU with 450W power limit.

Tests were performed in 2560x1440p resolution standing in some spot that is demanding on GPU. FPS value is live FPS reported by MSI Afterburner after some period given to stabilize.

In 1080p in allmost all scenarios, you can actually expect a 2x FPS increase

Cyberpunk 2077: all raster settings set to max. RT Ultra, DLSS Ray Reconstruction, DLSS Quality.

Option	Value
Without FG:	63 FPS
With FG:	108 FPS
Uplift:	71%

The Witcher 3 NextGen: all raster and RT settings set to max. DLSS Quality.

Option	Value
Without FG:	54 FPS
With FG:	95 FPS
Uplift:	76%

Ratchet & Clank: Rift Apart: all raster and RT settings set to max. No DLSS, DLAA AA enabled.

Option	Value
Without FG:	68 FPS
With FG:	114 FPS
Uplift:	68%

Alan Wake 2: raster profile high, no RT. DLSS Quality.

Option	Value
Without FG:	77 FPS
With FG:	130 FPS
Uplift:	69%

Alan Wake 2: raster profile high, medium RT profile. DLSS Quality.

Option	Value
Without FG:	36 FPS
With FG:	65 FPS
Uplift:	80%

It seems that the lower base FPS the higher is the boost. AW2 using demanding settings boosted from 36 FPS by 80%. Using lighter settings or looking at R&C Rift Apart, with pre-FG fps ~70 FPS and higher the boost is a bit under 70%. But such low base as 36 FPS will not provide good gaming experience due to increased latency. It will be better to drop 2-3 settings down, get to ~55 base FPS and only then consider enabling FG.