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C6455 is slower than DM642

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The same arithmetic used  the same data is running on the C6455 and DM642. C6455 takes 3  times more time than DM642.

C6455 CPU clk = 1GHz  (confirmed),  Memory being used: On chip IRAM L2, used DSP/BOIS, 1000 microsecond/Int

DM642 CPU clk = 600MHz, Memory being used: Off chip SDRAM, used DSP/BOIS, 1000 microsecond/Int

In theory, C6455 should be fast than DM642. I don't know why the result is not.

Ps: My project is based on the dsk6455 example 'dsp_app.prj'


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