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Old 07-19-2005, 09:11 AM   #1
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Default Everything You Need To Know About DDR, DDR2 and DDR3 Memories

There has been a new article posted.

Title: DDR2 Memory Tutorial
URL: http://www.hardwaresecrets.com/article/167

Here's a snippet:
"In this tutorial we will explore the main technical differences between DDR, DDR2 and DDR3 memories. Enjoy!"

Comments on this article are welcome.

Last edited by Gabriel Torres; 08-31-2009 at 02:14 PM. Reason: updated to reflect updates on the article text.
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Old 04-17-2006, 01:57 AM   #2
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This article is very useful to people especially when they need to compare which
RAM to buy and the information provided in this article is certainly needed to make their decision right.

P.S. Since more higher DDR2 is/are introduced to the market, please add their
clock tick duration per cycle to your current list.. Thank you.
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Old 10-30-2007, 09:32 AM   #3
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Nice article. Perhaps it needs a little updating?
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Old 11-01-2007, 03:14 PM   #4
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Yes, I plan to update this tutorial as soon as time allows me...

Gabriel.
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Old 08-28-2009, 04:10 AM   #5
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Thanks for the much needed update!

Now, if it only included some additional info about the difference between "plain" DDRx and GDDRx...

Cheers
Olle
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Old 08-28-2009, 09:00 AM   #6
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Nice article, I've learned something new, thanks!

PS.
On page 3:
"Typically DDR memories are fed with 2.5 V, DDR2 memories are fed with 1.8 V and DDR2 memories are fed with 1.5 V"

I think it should be DDR3
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Old 08-31-2009, 02:15 PM   #7
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Quote:
Originally Posted by Olle P View Post
Now, if it only included some additional info about the difference between "plain" DDRx and GDDRx...
See if this is what you are looking for:
http://www.hardwaresecrets.com/article/168
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Old 08-31-2009, 02:15 PM   #8
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Quote:
Originally Posted by Rzooq View Post
Nice article, I've learned something new, thanks!

PS.
On page 3:
"Typically DDR memories are fed with 2.5 V, DDR2 memories are fed with 1.8 V and DDR2 memories are fed with 1.5 V"

I think it should be DDR3
Fixed, many thanks! And welcome to our website!
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Old 08-31-2009, 10:48 PM   #9
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Quote:
Originally Posted by Gabriel Torres View Post
See if this is what you are looking for:
http://www.hardwaresecrets.com/article/168
I knew I'd seen it somewhere...

Still, adding a small note that the "G" prefix generally means "Factory over-volted and over-clocked." doesn't require much typing and saves the reader a search for that four years old article...

Cheers
Olle
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Old 05-30-2010, 04:16 PM   #10
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The Prefetch section doesn't make sense. You say that doubling the data lines inside the DDR3 module/individual chips allows it to have double the bandwidth of DDR2, but the arrow that points towards the Memory Controller indicates that in the end it should be bottlenecked by a 400MHz DDR interface.

Is it really possible to transfer 8 bits per clock on a single pin/line? Is the I/O Buffer just a parallel to serial circuit that buffers 8 bits and then pumps them onto a single line, 8 bits per hertz? It can't be that the data path between the I/O Buffer and Memory Controller is also widened, because the number of pins on DDR3 is the same as DDR2, 240 pins.
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