MIX wafer crumbs and margarine; press onto bottom and up side of 9-inch pie plate.
STIR boiling water into dry jelly powder in medium bowl with wire whisk until completely dissolved. Add ice cubes; stir until jelly is slightly thickened. Remove any unmelted ice. Add whipped topping; stir until well blended. Gently stir in peaches.
REFRIGERATE 15 min. or until mixture is thick enough to mound; spoon into crust. Refrigerate 3 hours or until set. Store leftovers in refrigerator.