You know that in Radeons the thousands tell the generation and the hundreds tell the power rating in that generation, don't you? Tens indicate minor differences like clocking. That said, three hundred is not very much compared to the most powerful eight or nine hundred series. Of course, the price difference is about tenfold, but so is the efficiency. There's charts and reviews in the net comparing the bang for a buck, too, since few of us are economically independent enough to get the ultimate rig for this hobby.