Naw, it's simpler than that. Die-cast is a metal mold that is pressure-filled with molten aluminum, zinc or "pot-metal", a blend. Cast is where a high-temp mold is prepared for gravity or pressure-fed alum., steel or other alloy. Forged is where a mold is made that can handle the pressure of hot-stamping an alloy by compression to a denser version of the original alloy. Forgings rule but they are expensive to make the compression molds for. Die-cast is a very cheap, fast way to make a lot of parts in an alloy that lends itself to lower-temp casting; zinc, tin, alum. Die-cast can make a very accurate part at high production rates but the material is always of the softer variety. Forgings are used for higher-strength alloys but almost always require post-machining. Real cast iron is done with the sand-mold made from a copy of the part made of foam or wax or steel that is removed before the "pour" is done. If you want a simple, though not completly accurate, test of die-cast or forged/cast, put a magnet to it. Die-cast is not magnetic as no steel(ferrites) are involved. Oh, crap! How many IMHOs do I have to put in now?