I ask because I'm currently using a custom 3D settings profile for Deus Ex (via the nvidia control panel) and while the original textures still look blocky up close, the effects are quite impressive. When I switch to Kentie's D3D DX10 renderer, I get the improved textures, but some of the effects aren't quite as fancy (I've tried emulating them through the renderer preferences in-game, but still can't make them look as slick).

I'm not sure what you mean by standard Nvidia renderer, but maybe OpenGL would work instead?