# SDR in a DDR slot ?

**URL:** <https://boards.straightdope.com/t/sdr-in-a-ddr-slot/146177>\
**Category:** Factual Questions\
**Created:** [January 2, 2003, 9:04am UTC](https://boards.straightdope.com/t/sdr-in-a-ddr-slot/146177 "2003-01-02T09:04:23Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Trader\_of\_shorts](https://avatars.discourse-cdn.com/v4/letter/t/90ced4/32.png) [@Trader\_of\_shorts](https://boards.straightdope.com/u/Trader_of_shorts)\
**Post date:** [January 2, 2003, 9:04am UTC](https://boards.straightdope.com/t/sdr-in-a-ddr-slot/146177/1 "2003-01-02T09:04:23Z")

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I know DDR can not work in an SDR slot - but how about the other way round ?

For use with AOPEN AX4B PRO-533

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**Author:** ![CrazyLittle](https://avatars.discourse-cdn.com/v4/letter/c/3ec8ea/32.png) [@CrazyLittle](https://boards.straightdope.com/u/CrazyLittle)\
**Post date:** [January 2, 2003, 9:21am UTC](https://boards.straightdope.com/t/sdr-in-a-ddr-slot/146177/2 "2003-01-02T09:21:14Z")

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simple answer: **NO** Go get the right ram for the right slot.

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**Author:** ![DougC](https://avatars.discourse-cdn.com/v4/letter/d/7feea3/32.png) [@DougC](https://boards.straightdope.com/u/DougC)\
**Post date:** [January 2, 2003, 11:11am UTC](https://boards.straightdope.com/t/sdr-in-a-ddr-slot/146177/3 "2003-01-02T11:11:07Z")

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- 
  - 
    - I _think_ they’re physically different: the last PC I put together had slots for both, and had two sets of slots, if you get my drift…  
~

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**Author:** ![Alereon](https://avatars.discourse-cdn.com/v4/letter/a/ecd19e/32.png) [@Alereon](https://boards.straightdope.com/u/Alereon)\
**Post date:** [January 2, 2003, 12:51pm UTC](https://boards.straightdope.com/t/sdr-in-a-ddr-slot/146177/4 "2003-01-02T12:51:30Z")

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Nope, completely incompatible. SDR SDRAM is 168pin, 3.3V. DDR SDRAM is 184pin, 2.5V.