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difference between (processors) TMS320C6452 and TMS320DM648

Other Parts Discussed in Thread: TMS320DM648, TMS320C6452

hello all,
i want to know that what is the difference between (processors) TMS320C6452 and TMS320DM648?
why there is so difference in the price?
100 units of C6452 processor IC have price of 125 $ for 720MHz and 156 $  for 900MHz.
100 units of DM648 processor IC have price of 68 $ for 720MHz and 85 $  for 900MHz.

what i came to know from documents, from different sources especially from ti.com, that
both processors are of 720 and 900 MHz.
both processors have same 3 port gigabit switch.
both processors supports 10/100/1000 Mbps.

there is a lot of similarities in both of them, that i had seen in the technical data sheets. i am so confused on this issue. please reply me today. because i am going to buy a board either TMDXDVP648 or TMS320C6452.

regards
akqureshi