15 Million polygons is a lot of polygons even for current processors. I've heard speculations that it will take the CPU industry about 4 years before it can push 15 Million ploygons. With this in mind, you are far better off buying a GeForce if you are intrested in playing polygon intensive games. Theoretically, today's high end processors can only push out 3-6 million triangles per second. DDR effectively doubles the memory data rate by reading and writing at both the rising and falling edge of each clock cycle.
RAM only uses the rising edge of each clock cycle.
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