# DDR Memory... is pc266 & pc2100 the same thing?
**URL:** https://boards.straightdope.com/t/ddr-memory-is-pc266-pc2100-the-same-thing/419782
**Category:** Factual Questions
**Created:** [September 19, 2007, 8:02pm UTC](https://boards.straightdope.com/t/ddr-memory-is-pc266-pc2100-the-same-thing/419782 "2007-09-19T20:02:27Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@RumMunkey](https://boards.straightdope.com/u/RumMunkey)
#### Post date: [September 19, 2007, 8:02pm UTC](https://boards.straightdope.com/t/ddr-memory-is-pc266-pc2100-the-same-thing/419782/1 "2007-09-19T20:02:27Z")
Weird. I just opened up a PC case to look at ram and found a single stick of DDR ram marked “pc266”.
I’ve never seen that before. Is it the same thing as pc2100? Can I replace this with a pc2100 stick?
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### Author:  [@larsenmtl](https://boards.straightdope.com/u/larsenmtl)
#### Post date: [September 19, 2007, 9:25pm UTC](https://boards.straightdope.com/t/ddr-memory-is-pc266-pc2100-the-same-thing/419782/2 "2007-09-19T21:25:37Z")
[QUOTE=RumMunkey]
Weird. I just opened up a PC case to look at ram and found a single stick of DDR ram marked “pc266”.
I’ve never seen that before. Is it the same thing as pc2100? Can I replace this with a pc2100 stick?
[/QUOTE]
Yes.
> **[DDR SDRAM](https://en.wikipedia.org/wiki/DDR_SDRAM#Chips_and_modules)**
>
> Double data rate synchronous dynamic random-access memory (DDR SDRAM) is a type of synchronous dynamic random-access memory (SDRAM) widely used in computers and other electronic devices. It improves on earlier SDRAM technology by transferring data on both the rising and falling edges of the clock signal, effectively doubling the data rate without increasing the clock frequency. This technique, known as double data rate (DDR), allows for higher memory bandwidth while maintaining lower power consum...