Whirlpool Gold® GSC308PR 30" 30-Inch Built-In Speedcook /Convection Oven Combination Oven. The power of convection cooking and g2Max™ SpeedCook technology combine to give you the ultimate in cooking flexibility. Achieve efficient, uniform cooking results 30% faster than a traditional Whirlpool® brand thermal-bake oven with a convection cooking lower oven, while the SpeedCook upper oven grills steaks and bakes brownies with real oven results.