Mail T604 and T624 Difference

Note: This was originally posted on 1st March 2013 at http://forums.arm.com

Hi! I'm not used in GPU. I am looking for 2d and 3d graphic multicore solution and I found Mail T604 and T624. The two mail are said to have graphic solution.
Yet, I'm puzzled by the description of the two mail. I have only one core. What is the difference of T604 and T624 if they are both scalable multi core solution for 2d and 3d graphic?
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