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Raspberry Pi Forum RPi Model A or B?
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  • State Verified Answer
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RPi Model A or B?

Former Member
Former Member over 11 years ago

Last year I purchased what I thought was a Model-A Raspberry Pi from Element-14/Newark (US). Since I later had a project that needed a Model-B, I bought one of those also, a few weeks ago.

 

Recently, I was checking out the differences between the two models and found that, according to various sources, The Model-B has 2 x USB ports (1 on the Model-A) and an Ethernet port (none on the Model-A) as well as a memory size difference.

 

Now my "Model-A" has both an Ethernet port and two USB ports so I'm confused. Is it, in fact a Model-B (which I didn't think was around when I bought the first one)? Is my information on the model differences wrong? I would appreciate it if someone could shed some light on this and clear up my confusion.

 

Also, what's the easiest way to check the amount of memory?

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  • johnbeetem
    0 johnbeetem over 11 years ago

    You have a Model B.  RasPi Model B was the first to ship.  Originally RasPi was going to ship both, but there was so much demand for the Model B that they didn't bother with the Model A for a long time.

     

    The RasPi Hardware Wiki has a page with the RasPi hardware history, with a table that maps board revision numbers to amount of memory: http://elinux.org/RPi_HardwareHistory

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  • merlin13
    0 merlin13 over 11 years ago

    There is indeed some confusion that was created because in some places the original Model B (with only 256 MB RAM) was named Model A. In fact, as far as I know the models are:

    - early Model B with 256 MB RAM, 2 USB, Ethernet - this one is incorrectly named Model A in some places

    - late/current Model B 512 MB RAM, 2 USB, Ethernet - more memory than early Model B but otherwise identical (well, there is also a small difference in GPIO pins)

    - Model A released last year, that indeed has only one USB, no Ethernet and only 256 MB of RAM.

     

    Hope this helps.

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  • Former Member
    0 Former Member over 11 years ago in reply to merlin13

    Thanks, John and Merlin. The picture gets much clearer.

     

    So it would seem I have a Model-B of either 256 or 512 MB RAM. Which makes my final question all the more pertinent. How would I positively check the amount of RAM? Presumably I can do this from Linux or the GUI but I'm not sufficiently familiar with either to know how.

     

    (Update .... I just went to the hardware wiki link that John provided. It tells me how to check there. So thanks a bunch Guys!

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  • devinsheppard
    0 devinsheppard over 11 years ago in reply to Former Member

    Yes it is definitely a B model. Really I dont even see why the went ahead with the A model.

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  • merlin13
    0 merlin13 over 11 years ago in reply to devinsheppard

    To be honest, I quite like my Model A. For less than $50 (Pi + dongle + SD card) I have a device always WiFi connected. I know there are other options out there but nothing wireless and capable of running a real OS like RasPi in the same price range. At least nothing that I know of.

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  • johnbeetem
    0 johnbeetem over 11 years ago in reply to devinsheppard

    Since the Model A has no Ethernet or USB hub, it draws significantly less power than the Model B.  This makes it a better choice for a battery-operated robot, for example.

     

    And, of course, the Model A is US$10 cheaper.  RasPi's slogan at raspberrypi.org for a long time was "An ARM GNU/Linux box for $25.  Take a byte!"  This got to be embarrassing when the only board you could buy was $35.  "GNU/Linux box" was kind of misleading too, though RasPi does come in a cute little element14 box suitable for rolling up in your T-shirt sleeve image

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  • devinsheppard
    0 devinsheppard over 11 years ago in reply to johnbeetem

    I do see the point in the power consumption and using wifi with a robot, But I still would want that ethernet port. Just me though.

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  • devinsheppard
    0 devinsheppard over 11 years ago in reply to merlin13

    The Beaglebone Black comes close but still not as cheap.

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  • charlesb255
    0 charlesb255 over 11 years ago

    Just to let you know, the way you tell the difference between the 256meg and the 512meg is that the 512meg has mounting holes

    and the 256meg does not.

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  • rew
    0 rew over 11 years ago in reply to charlesb255

    Not true...

     

    The "upgrade" to the PCB with the mounting holes came first. A few (thousand) of those were made with 256Mb RAM.

     

    Then the upgrade to 512Mb RAM was done. There was a small period with REV2 PCBS (with mouting holes) and only 256Mb RAM.

     

    But yes, chances are that with mounting holes has 512Mb RAM, and without has only 256.

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