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DMI in Atom processor

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March 18, 2011 6:38:50 PM

Hello,

I noticed that some Atom processors use DMI to connect to memory. If I understand correctly, these Atom processors integrated memory control chip inside the processors. But I hope someone can help me clarify the memory accessing speed. For Atom N550 (http://ark.intel.com/Product.aspx?id=50154), DMI is 2.5GT/s. Does it mean the maximal memory accessing rate is 2.5*8=20GB/s if the memory is fast enough? If this is true, it seems this type of Atom processors can support much faster memory. Even DDR3 cannot be this fast.

Thanks,
Da

More about : dmi atom processor

March 18, 2011 7:30:54 PM

DMI does not connect to memory. It connects to the I/O and peripheral hub.

The memory controller on non-FSB Atoms is integrated and has nothing to do with DMI.
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March 18, 2011 8:09:33 PM

I see. For non-FSB Atoms, what can decide the maximal memory bandwidth? The speed of memory itself?
Sorry, maybe it's a very stupid question. I just get a little confused.

Thanks
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March 18, 2011 8:17:07 PM

The built in memory controller, the details of which are found in the datasheets themselves. For instance, for the N400 family:

http://download.intel.com/design/processor/datashts/322...

Page 13 shows maximum memory performance. There might be a better document which lists this easier, but I'm not finding one immediately.
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March 18, 2011 8:45:34 PM

I see. So integrating memory controller in CPU cannot really improve the memory bandwidth. The memory bandwidth on Atom processors are really slow.
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March 18, 2011 8:45:43 PM

Best answer selected by icoming.
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