Yeah, PS2's Graphics Synthesizer had a fill rate of 1.2 GB/s. For comparison, the OG Xbox had 0.932 GB/s, and the GameCube had 0.648GB/s. Assuming only 1 texture here.

The Xbox was released 1 year later, for context.

Sony also demo'd the GSCube once, it had 16 Graphics Synthesizers, achieving a fill rate of 37.7 GB/s (no textures, half that with 1... I think). Eventually they ditched the idea in favour of Nvidia's solution.