Graphics mode changes

Exactly WHAT is cleared, and what remains in memory when graphics (specifically graphics3D) mode is changed?

Meshes,
Sprites,
Images,
Sounds,
3D Sounds,
Textures,
Terrains,
Mirrors
etc.etc.
?

I'm under the impression it is everything and anything to do with DirectX.

Sounds are -not- cleared, don't know about 3DSounds, but I don't think so. Sounds go through FMOD. I remember reading Mark's early posts about his frustrations with DirectSound ;] Was a good read =]