Texture problem - into RAM memory ??

Hi I wrote simple game, but I have some problems. - When I load new level with new textures it seems to load into RAM memory (i have video card with 256MB) ? - It is posible to delete mipmaps ?? (I create it with gluBuild2DMipmap) How ? And last question: - It is posible to check that my scene is rendering by gpu (or software) ? PS.THX PS.Sorry for my bad englisch