these are tradeoff between DDR2 (for higher speed, but higher read latencies) vs DDR (lower speed + read latencies). <div><br></div><div>so if u make the bus speed the same for both, then DDR2's higher latencies will make it slower than DDR. </div>
<div><br></div><div><a href="http://www.diffen.com/difference/DDR_vs_DDR2">http://www.diffen.com/difference/DDR_vs_DDR2</a></div><div><br></div><div>and a technical comparison charts in numbers:</div><div><br></div><div><a href="http://www.freescale.com/webapp/sps/site/overview.jsp?code=784_LPBB_DDR">http://www.freescale.com/webapp/sps/site/overview.jsp?code=784_LPBB_DDR</a></div>
<div><br><br><div class="gmail_quote">On Mon, Jun 3, 2013 at 2:39 PM, devendra.aaru <span dir="ltr"><<a href="mailto:devendra.aaru@gmail.com" target="_blank">devendra.aaru@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hello,<br>
<br>
I have two different types of hardware, one with DDR SDRAM and another DDR2,<br>
i tested them with bw_mem tool for write bandwidths, seems that at<br>
higher writes of >512kbytes the DDR is faster than the DDR2(more than<br>
40%). But when compared to reads, DDR is slower (more than 50%). I<br>
couldn't find any reference that explains why. AFAIK, the DDR2 works<br>
double the faster rate than the DDR.<br>
<br>
<br>
any ideas?<br>
<br>
Thanks,<br>
<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br>Regards,<br>Peter Teoh
</div>