CGO heeft een review van de Matrox G400 gepost. Hier heb je wat info over Environment-mapped bump mapping op de G400:
Environment-mapped bump mapping is a little confusing. It's a feature, made available by DirectX 6, which can make normal flat textures look like they have relief and reflect their environment. Most current 3D cards support what is called "emboss bump mapping" which approximates true bump mapping by blending and converting an additional texture. This method is good, but has limitations that true EMBM does not. The emboss method cannot handle multiple light sources or lights of different colors, nor can it produce animated bumps. EMBM, on the other hand, quite easily produces effects like rippling waves, and more easily handles greater ranges of simulated bumpiness. This feature is being supported for spot-effects in quite a few titles, but like any new graphic effect, it comes at a cost. EMBM, like the emboss method, requires an additional bump map texture and some blending. Thus, it has the same performance hit as any other multi-pass rendering effect. This is typically between 10-30%, depending on how much of the scene is bump-mapped. Whether or not this performance cost justifies the improved visual quality is something that will vary from person to person and title to title. Regardless, only the G400 gives users that option.
In de review vind je een aantal bumpmapping screenshots en verder nog een paar benchmarks die de G400 met een oude TNT vergelijken. Check 't hier.