MIX graham crumbs and margarine; press firmly onto bottom and up side of 9-inch pie plate.
STIR boiling water into dry jelly powder in large bowl 2 min. or until completely dissolved. Add enough ice to cold water to measure 1 cup. Add to jelly; stir until slightly thickened. Remove any unmelted ice. Add 3/4 cup of the whipped topping; stir with wire whisk until well blended. Pour into crust. Refrigerate 4 hours or until firm.
TOP with remaining 1/2 cup whipped topping just before serving. Store leftovers in refrigerator.