ADD pasta to large saucepan of boiling water; cook 10 min. or just until tender.
MEANWHILE, place cream, walnuts, 1/2 cup of the cheese, the garlic and salt and pepper in blender; cover. Blend until smooth.
DRAIN pasta; return to pan. Add sauce; mix lightly. Cook on medium heat 3 to 5 min. or just until heated through. Sprinkle with remaining 1/4 cup cheese.
