Dual Channel DDR RAM:
When Dual Channel DDR Technology is activated, the
bandwidth of Memory Bus will be double the original Memory Bus, with the
fastest speed at 6.4GB/s DDR400. To activate Dual Channel DDR
Memory, two DDR Memory Modules are inserted individually, one each into
Channel A and Channel B.
We never used nor advocated the use of RAMBUS Memory. Only DDR! And what does DDR stand for? Get it!
Serious, Dual Channel DDR is a function of the Memory Controller and NOT the RAM although achieving the intended throughput requires Two DDR Modules of the same RAM as explained in detail below.
While recently inquiring with Crucial regarding Dual Channel DDR support we were informed, "There is no such thing as Dual Channel DDR. You need to read your manual of your motherboards and see if they support Dual Channel capability. For the Dual Channel capability, you need to install the matched pairs in the appropriate slots." Interesting response - IMO. We expected better. Shortly thereafter, The Crucial Insider - May 29, 2003 sent out 'The truth about Dual-Channel Memory' as follows:
Quoting Crucial, "DDR In-Depth: Dual Channel
The terminology "Dual-Channel DDR" is
being misused by some in the Memory industry, which can mislead the
Consumer. The fact is there's no such thing as Dual-Channel DDR Memory.
There are, however, Dual-Channel Platforms. [Memory Controller]
For example, One Controller reads and writes data while the Second Controller prepares for the next access, hence, eliminating the reset and setup delays that occur before One Memory Module can begin the read/write process all over again. Think of it like two relay runners.
The first runner runs one leg while the second
runner sets up and prepares to receive the baton smoothly and carry on the
task at hand without delay. While performance gains from Dual-Channel
Chipsets aren't huge, they can increase Bandwidth by as much as 10
percent. To those seeking to push the performance envelope, that 10
percent can be very important.
If indeed you have a Dual-Channel Platform and you want to take advantage of the performance gain it offers, our advice is to opt for high quality and service over expensive packaging, and simply purchase your DDR Memory in Pairs. However, be very careful to order Two Modules with the exact same Specifications; the Modules must be identical to each other to perform correctly." Thank you Crucial for that clarification.
So this Dual Channel terminology thing started with RAMBUS Memory and now Dual Channel Memory Interleaving from Intel has caught on with DDR Memory. Dual Channel Memory Interleaving was the term Intel used during our Intel Technical Solutions Training Summer 2003 in Houston, TX.
Also notice Intel has NOT recommended using Memory Modules greater than 512 MB yet on Desktop Boards. Currently the highest capacity of Certified DDR Memory Modules are 512 MB (6/28/2003).
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Web Development, Gill Boyd & Team - Posted 06/17/2003; Updated 08/16/2005