What is "dual-channel DDR"?

[James Knott]

Lennart Sorensen wrote:
> On Tue, Mar 15, 2005 at 08:49:53PM -0500, William Park wrote:
> 
>>What is dual-channel DDR?  Is it also called "DDR2"?
>>
>>I'm interested in Abit AV8 (AMD64, S939)
>>    <http://www.abit-usa.com/products/mb/products.php?categories=1&model=175>
>>which takes dual-channel DDR.  But, I don't know what that means.  My
>>experience ends with SDRAM and Pentium 3.
> 
> 
> Dual channel means you take two sticks of memory and run them in
> parallel so you have twice the bandwidth available.  This works by
> having two memory controllers running the memory as two seperate chunks
> of memory.  Access to memory is then split evenly across the two chunks
> (usually works best if you have each chunk identical size so you can
> alternate between the two chunks for every address).

Interleaving was often used with core memory, as it was considerably 
slower than the CPU, with the erase on read & rewrite cycles.
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