In medium bowl, toss cheeses and flour to mix. Place wine in 2-quart saucepan; cook over medium heat about 1 minute or until very hot. DO NOT BOIL. Add cheese mixture 1/2 cup at a time, stirring each until melted. Cook until very warm. Stir in garlic powder. Pour into fondue pot. Keep warm over medium-low heat.
To serve, skewer bread cubes with fondue forks to dip into warm cheese.