DDR / dual pumped explanation please

Luis

Distinguished
Apr 7, 2004
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I've read DDR memory can send/receive data in both edges of the clock signal.

So DDR266 works on a 133 MHz bus
DDR333 works on a 166 MHz bus
DDR400 works on a 200 MHz bus

In the other hand I've heared that the Athlon XP has a dual pumped FSB so it can transmit with a speed of

266 on a 133 MHz bus
333 on a 166 MHz bus
400 on a 200 MHz bus

So... DDR is the same thing as "Dual Pumped"?

The memory is dual pumped or DDR?
The cpu is dual pumped or DDR?
The Front Side Bus is dual pumped or DDR?

If 266,333 and 400 MHz are called "FSB effective speeds"
what is the correct term for the real 133, 166 and 200 MHz speeds.
 

Crashman

Polypheme
Former Staff
I think some 12 year old invented the term "double pumped" to make DDR sound cool. It's double data rate. Both the XP bus and DDR SDRAM are double data rate.

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Spitfire_x86

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Jun 26, 2002
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12 year old invented the term "double pumped"....so who invented the term "quad pumped"? Maybe some 10 year old kid? :wink:

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darko21

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Sep 15, 2003
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Exactly double pumped is just as valid as quad pumped if not more so.

If I glanced at a spilt box of tooth picks on the floor, could I tell you how many are in the pile. Not a chance, But then again I don't have to buy my underware at Kmart.
 

Crashman

Polypheme
Former Staff
Nobody "invented" quad pumped, some imbicile thought "double pumped" sounded good so he copied it.

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Crashman

Polypheme
Former Staff
Both are equally pathetic as they do nothing to aid the understanding of the technology and in fact promote ignorance. In fact Double Date Rate and Quad Data Rate are far more discriptive than the terms AGP2x and AGP4x derived from similar technology.

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