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同样的算法在C66X上的运算速度比C674x慢

请教大家:

      我们有两个开发板分别使用DM8148(DSP为C674X)与TDA2X(DSP为C66X),在其DSP上运行同样的算法,发现C674X比C66X要快。两个扳子所使用的DD主频都是533,DSP主频都是750。请教可能是什么原因?