these are tradeoff between DDR2 (for higher speed, but higher read latencies) vs DDR (lower speed + read latencies).
so if u make the bus speed the same for both, then DDR2's higher latencies will make it slower than DDR. http://www.diffen.com/difference/DDR_vs_DDR2 and a technical comparison charts in numbers: http://www.freescale.com/webapp/sps/site/overview.jsp?code=784_LPBB_DDR On Mon, Jun 3, 2013 at 2:39 PM, devendra.aaru <[email protected]>wrote: > 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, > > _______________________________________________ > Kernelnewbies mailing list > [email protected] > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -- Regards, Peter Teoh
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