Why is that the write speed of DDR SDRAM are faster than the DDR2

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Hello,

I have two different types of hardware, one with DDR SDRAM and another DDR2,
i tested them with bw_mem tool for write bandwidths, seems that at
higher writes of  >512kbytes the DDR is faster than the DDR2(more than
40%). But when compared to reads, DDR is slower (more than 50%). I
couldn't find any reference that explains why. AFAIK, the DDR2 works
double the faster rate than the DDR.


any ideas?

Thanks,

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